CM9730 LG SUPER POWER MINI HI-FI SYSTEM - troubleshooting
NO
POWER
If the unit doesn’t work by no power problem, repair the set according to the following guide.
FUSE / BRIDGE DIODE / THERMISTOR
Check and replace F901, BD901, TH900, TH901, TH902 on SMPS board.
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH900 ~ TH902 is normal or open.
If the unit doesn’t work by no power problem, repair the set according to the following guide.
FUSE / BRIDGE DIODE / THERMISTOR
Check and replace F901, BD901, TH900, TH901, TH902 on SMPS board.
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH900 ~ TH902 is normal or open.
NO
POWER
If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide.
NO AMP POWER
Check and replace F911, Q911 ~ Q914 on SMPS board.
1) Check if the fuse F901 is open or short-circuit.
2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q911~Q914 with a digital multi-meter.
If it is short condition, it’s destroyed. Replace it with a new one.
(Replace 4 FET at the same time although several FET is OK)
If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide.
NO AMP POWER
Check and replace F911, Q911 ~ Q914 on SMPS board.
1) Check if the fuse F901 is open or short-circuit.
2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q911~Q914 with a digital multi-meter.
If it is short condition, it’s destroyed. Replace it with a new one.
(Replace 4 FET at the same time although several FET is OK)
NO
BOOTING WHEN POWER ON THE SET
The set doesn’t work when presses the power button on the front board or the remote control.
FLASH MEMORY (IC101)
Check and replace IC101 on MAIN board.
1) Check the 5.6 VA (CN102) and 3.7 VA (IC104) in standby mode.
If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.7 VA, check IC104.
2) Check 5.6 VA, 12 V, FL+, FL-, an 32 V when power on the set.
- If the set doesn’t work regardless of what the KEY2 changes high to low while pressing the power button.
X100 and X101 work normally but, if you cannot power on the set, replace the IC101 with a new one on the MAIN board.
The set doesn’t work when presses the power button on the front board or the remote control.
FLASH MEMORY (IC101)
Check and replace IC101 on MAIN board.
1) Check the 5.6 VA (CN102) and 3.7 VA (IC104) in standby mode.
If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.7 VA, check IC104.
2) Check 5.6 VA, 12 V, FL+, FL-, an 32 V when power on the set.
- If the set doesn’t work regardless of what the KEY2 changes high to low while pressing the power button.
X100 and X101 work normally but, if you cannot power on the set, replace the IC101 with a new one on the MAIN board.
VFD
IS NOT DISPLAYED WHEN POWER ON THE SET
When power on the set, any icons or characters on VFD are not displayed.
VFD (DIG301)
Check and replace DIG301 on FRONT board.
1) Check if 32 V, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if the IC101 outputs VFD_RST, VFD_CLK, VFD_STB and VFD_STB to the FRONT board.
3) Check if the VFD grid current amplifier circuit (Q301, Q303, Q304) on the FRONT board.
Check the drive signal to the transistor’s base.
If the control signals from VFD (TP302, TP303, TP304) isn’t output, replace VFD with a new one.
If the transistor doesn’t work, replace it.
When power on the set, any icons or characters on VFD are not displayed.
VFD (DIG301)
Check and replace DIG301 on FRONT board.
1) Check if 32 V, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if the IC101 outputs VFD_RST, VFD_CLK, VFD_STB and VFD_STB to the FRONT board.
3) Check if the VFD grid current amplifier circuit (Q301, Q303, Q304) on the FRONT board.
Check the drive signal to the transistor’s base.
If the control signals from VFD (TP302, TP303, TP304) isn’t output, replace VFD with a new one.
If the transistor doesn’t work, replace it.
NO
BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
NO VCC33, VCC12
Check and replace IC505, IC509 on MAIN board.
1) Check Voltage of IC505 pin2 on MAIN board.
If IC505 pin2 (about 4.9 V) & D501 Input 5.6 VA doesn’t come out, check 5.6 VA from SMPS board.
2) If IC505 pin2 (about 4.9 V) is normal, check the PWR_CTRL (IC505 pin1) is high (about 3.3 V).
If PWR_CTRL isn’t high, check pin63 of IC101 & R149,R503.
3) If PWR_CTRL is high, check R592, R593 and if there’s no defective component then replace IC505.
4) If 3.3 V (VCC33) is normal, check output (pin2, 4) voltage of IC509.
If 1.2 V of IC509 pin2, 4 doesn’t come out, then replace IC509.
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
NO VCC33, VCC12
Check and replace IC505, IC509 on MAIN board.
1) Check Voltage of IC505 pin2 on MAIN board.
If IC505 pin2 (about 4.9 V) & D501 Input 5.6 VA doesn’t come out, check 5.6 VA from SMPS board.
2) If IC505 pin2 (about 4.9 V) is normal, check the PWR_CTRL (IC505 pin1) is high (about 3.3 V).
If PWR_CTRL isn’t high, check pin63 of IC101 & R149,R503.
3) If PWR_CTRL is high, check R592, R593 and if there’s no defective component then replace IC505.
4) If 3.3 V (VCC33) is normal, check output (pin2, 4) voltage of IC509.
If 1.2 V of IC509 pin2, 4 doesn’t come out, then replace IC509.
NO
BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
CRYSTAL (X501)
Check and replace X501 on MAIN board.
1) If 3.3 V & 1.2 V is normal, check Reset ‘High’ of IC501 pin153 on MAIN board.
If MAIN_RESET isn’t high, check MICOM (IC101) pin59.
2) If MAIN_RESET is high, check the soldering status of 12 MHz crystal (X501).
3) If the crystal (X501) doesn’t oscillate, check R541,R542,C517,C518 around crystal (X501).
If there’s no defective component, then replace X501.
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
CRYSTAL (X501)
Check and replace X501 on MAIN board.
1) If 3.3 V & 1.2 V is normal, check Reset ‘High’ of IC501 pin153 on MAIN board.
If MAIN_RESET isn’t high, check MICOM (IC101) pin59.
2) If MAIN_RESET is high, check the soldering status of 12 MHz crystal (X501).
3) If the crystal (X501) doesn’t oscillate, check R541,R542,C517,C518 around crystal (X501).
If there’s no defective component, then replace X501.
NO
BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
SERIAL FLASH (IC503)
Check and replace IC503 on MAIN board.
1) If the crystal (X501) does oscillate, check serial flash (IC503) on MAIN board.
Check pin8(VCC), pin6(CLK), pin1(CS#), pin2(DO), pin5(DI) of below waveform.
2) If pin1, 2, 5, 6, 8 doesn’t come out, check damping resistor (R511, R513, R514, R515) of IC503.
If damping resistor of IC503 is OK, then replace IC503. (it need to download program)
3) After change IC503, if It is still not below waveform, check IC501(DSP IC).
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
SERIAL FLASH (IC503)
Check and replace IC503 on MAIN board.
1) If the crystal (X501) does oscillate, check serial flash (IC503) on MAIN board.
Check pin8(VCC), pin6(CLK), pin1(CS#), pin2(DO), pin5(DI) of below waveform.
2) If pin1, 2, 5, 6, 8 doesn’t come out, check damping resistor (R511, R513, R514, R515) of IC503.
If damping resistor of IC503 is OK, then replace IC503. (it need to download program)
3) After change IC503, if It is still not below waveform, check IC501(DSP IC).
NO
BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
SDRAM (IC502)
Check and replace IC502 on MAIN board.
1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
If pin17(#CAS), pin18(#RAS), pin19($CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
check damping resistor (R508, R506, R504, R507).
2) If resistor is OK, then replace IC502 (SDRAM).
3) After change IC502, if It is still not below waveform, check IC501 (DSP IC).
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
SDRAM (IC502)
Check and replace IC502 on MAIN board.
1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
If pin17(#CAS), pin18(#RAS), pin19($CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
check damping resistor (R508, R506, R504, R507).
2) If resistor is OK, then replace IC502 (SDRAM).
3) After change IC502, if It is still not below waveform, check IC501 (DSP IC).
NO
BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
DSP IC (IC501: MLC3700A)
Please check and replace IC501 on MAIN board.
1)After check them by previous pages about NO Booting, if the set is still no booting,
Check soldering status of IC501.
Check boot strap option (R598, R594, R597) of IC501(DSP IC).
2) If below bootstrap waveform doesn’t come out, then replace IC501 (DSP IC).
After you turn on power key and displayed message in the following order
(HELLO > VOL XX > CD or USB) on VFD,
it will not display other message on VFD, and it will not boot-up normally.
DSP IC (IC501: MLC3700A)
Please check and replace IC501 on MAIN board.
1)After check them by previous pages about NO Booting, if the set is still no booting,
Check soldering status of IC501.
Check boot strap option (R598, R594, R597) of IC501(DSP IC).
2) If below bootstrap waveform doesn’t come out, then replace IC501 (DSP IC).
NO
OPERATION OF MD
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
SPINDLE MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check the SPDO signal from Pin16 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check the SP- & SP+ from IC408 to CN405 for driving SPINDLE motor. It is about 3.6 Vp-p.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the spindle motor is sort-circuit or has any trouble, it can not rotate CD discs.
Please check the function after changing another MD.
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
SPINDLE MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check the SPDO signal from Pin16 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check the SP- & SP+ from IC408 to CN405 for driving SPINDLE motor. It is about 3.6 Vp-p.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the spindle motor is sort-circuit or has any trouble, it can not rotate CD discs.
Please check the function after changing another MD.
NO
OPERATION OF MD
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
SLED MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check the SLDO signal from Pin15 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check the SLED+ & SLED- from IC408 to CN405 for driving SPINDLE motor. It is about 2.9 Vp-p.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the sled motor is sort-circuit or has any trouble, it can not move the pick-up module.
Check the function after changing another MD.
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
SLED MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check the SLDO signal from Pin15 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check the SLED+ & SLED- from IC408 to CN405 for driving SPINDLE motor. It is about 2.9 Vp-p.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the sled motor is sort-circuit or has any trouble, it can not move the pick-up module.
Check the function after changing another MD.
NO
OPERATION OF MD
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
TRAY OPEN/CLOSE MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check MOT_OPEN & MOT_CLOSE signals from Pin62 & 63 of IC501 to IC408.
If no signal, check +1.8 V & + 5 V to IC408.
2) Check LOAD± from IC408 to CN405 for driving the tray open / close motor. It is about 3.85 Vp-p.
If no signal, check +5 V to IC408. If it has any trouble, replace it with a new one.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the tray motor is sort-circuit or has any trouble, it can not open or close the tray.
Check the function after changing another MD.
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the
TRAY OPEN/CLOSE MOTOR among them.
Check and replace IC407, IC408 on MAIN board.
1) Check MOT_OPEN & MOT_CLOSE signals from Pin62 & 63 of IC501 to IC408.
If no signal, check +1.8 V & + 5 V to IC408.
2) Check LOAD± from IC408 to CN405 for driving the tray open / close motor. It is about 3.85 Vp-p.
If no signal, check +5 V to IC408. If it has any trouble, replace it with a new one.
3) Check if the FFC cable is solidly connected between CN405 and MD.
4) Check the MD.
If the tray motor is sort-circuit or has any trouble, it can not open or close the tray.
Check the function after changing another MD.
NO
OPERATION OF MD
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR.
Check and replace IC407, IC408 on MAIN board.
The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.
1) Check the TRD signal from Pin14 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check T- & T+ from IC408 to CN404 for driving the tracking actuator.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN404 and MD.
4) Check the MD.
If the pick-up module has any trouble, it cannot move the laser beam on the left or right side.
Check the function after changing another MD.
When no sound output in the CD function, you cannot listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR.
Check and replace IC407, IC408 on MAIN board.
The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.
1) Check the TRD signal from Pin14 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check T- & T+ from IC408 to CN404 for driving the tracking actuator.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN404 and MD.
4) Check the MD.
If the pick-up module has any trouble, it cannot move the laser beam on the left or right side.
Check the function after changing another MD.
NO
OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the
LASER FOCUSING ACTUATOR.
Check and replace IC407, IC408 on MAIN board.
How to troubleshoot
The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.
1) Check the FOD signal from Pin13 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check F- & F+ from IC408 to CN404 for driving the focusing actuator.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN404 and MD.
4) Check the MD.
If the pick-up module has any trouble, it can not move the laser beam on the top or bottom side.
Check the function after changing another MD.
When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the
LASER FOCUSING ACTUATOR.
Check and replace IC407, IC408 on MAIN board.
How to troubleshoot
The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.
1) Check the FOD signal from Pin13 of IC407.
If no signal, check 3.3 V(RF) and X402.
2) Check F- & F+ from IC408 to CN404 for driving the focusing actuator.
If no signal, check +1.8 V and +5 V for IC408.
3) Check if the FFC cable is solidly connected between CN404 and MD.
4) Check the MD.
If the pick-up module has any trouble, it can not move the laser beam on the top or bottom side.
Check the function after changing another MD.
NO
SOUND
There is no sound output in the CD FUNCTION, repair the set according to the following guide.
Check and replace IC501, IC600 on MAIN board.
1) Check CD_BCK, CD_LRCK, & CD_DATA signals from IC407 to IC501.
If no signal, check if the RF & servo signals from MD is entered to IC407.
Refer to the “No operation of MD” guide.
2) Check the following I2S signal flow. < I2S audio signal Interface >
- DAC_BCK : IC501_pin4 > IC600_pin4
- DAC_LRCK : IC501_pin5 > IC600_pin5 (44.1 kHz)
- DAC_DATA : IC501_pin85 > IC600_pin6, 9
- DAC_MCLK : IC501_pin3 > IC501_pin82
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
3) Check if “Digital audio AMP block”.
There is no sound output in the CD FUNCTION, repair the set according to the following guide.
Check and replace IC501, IC600 on MAIN board.
1) Check CD_BCK, CD_LRCK, & CD_DATA signals from IC407 to IC501.
If no signal, check if the RF & servo signals from MD is entered to IC407.
Refer to the “No operation of MD” guide.
2) Check the following I2S signal flow. < I2S audio signal Interface >
- DAC_BCK : IC501_pin4 > IC600_pin4
- DAC_LRCK : IC501_pin5 > IC600_pin5 (44.1 kHz)
- DAC_DATA : IC501_pin85 > IC600_pin6, 9
- DAC_MCLK : IC501_pin3 > IC501_pin82
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
3) Check if “Digital audio AMP block”.
NO
SOUND
There is no sound output in the USB FUNCTION, repair the set according to the following guide.
Check and replace IC501, IC504 on MAIN board & IC3U01 on USB board.
How to troubleshoot
1) Check +5VU to USB board.
If +5.6 VA to pin2 of IC3U01(LDO) doesn’t come out, check pin4, 5 of CN502.
If +5.6 VA is normal & +5VU of IC3U01 pin3 doesn’t come out, and then replace IC3U01.
2) Check USB D± from main board to USB board.
a. Check USB_HUB_DN/DP signals to IC501(pin16, 18)
b. Check USB1/2_DN/DP signals from IC501 to CN502 (pin1, 2, 9 & 10)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
3) Check if “Digital audio AMP block”.
There is no sound output in the USB FUNCTION, repair the set according to the following guide.
Check and replace IC501, IC504 on MAIN board & IC3U01 on USB board.
How to troubleshoot
1) Check +5VU to USB board.
If +5.6 VA to pin2 of IC3U01(LDO) doesn’t come out, check pin4, 5 of CN502.
If +5.6 VA is normal & +5VU of IC3U01 pin3 doesn’t come out, and then replace IC3U01.
2) Check USB D± from main board to USB board.
a. Check USB_HUB_DN/DP signals to IC501(pin16, 18)
b. Check USB1/2_DN/DP signals from IC501 to CN502 (pin1, 2, 9 & 10)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
3) Check if “Digital audio AMP block”.
NO
SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the following guide.
Check and replace IC202 on MAIN board.
How to troubleshoot
1) Check AUX_L/R signals to IC202 (Pin7, 8).
2) Check if DAC_BCLK, DAC_LRCLK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
There is no sound output in the AUX FUNCTION, repair the set according to the following guide.
Check and replace IC202 on MAIN board.
How to troubleshoot
1) Check AUX_L/R signals to IC202 (Pin7, 8).
2) Check if DAC_BCLK, DAC_LRCLK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
NO
SOUND
There is no sound output in the PORT. IN FUNCTION, repair the set according to the following guide.
Check and replace IC202 on MAIN board.
How to troubleshoot
1) Check PT_L/R signal from JOG board to MAIN board.
2) Check if PT_LR is entered Pin4 & 5 of CN3J01 Ö Pin4 & 5 of CN3V02 Ö Pin21 & 20 of CN3V01.
3) Check POT_L/R signals to IC202(Pin21, 22).
4) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
5) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but ,
if the signal waveform to the IC is distorted or no signal, replace it with a new one.
7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
There is no sound output in the PORT. IN FUNCTION, repair the set according to the following guide.
Check and replace IC202 on MAIN board.
How to troubleshoot
1) Check PT_L/R signal from JOG board to MAIN board.
2) Check if PT_LR is entered Pin4 & 5 of CN3J01 Ö Pin4 & 5 of CN3V02 Ö Pin21 & 20 of CN3V01.
3) Check POT_L/R signals to IC202(Pin21, 22).
4) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
5) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but ,
if the signal waveform to the IC is distorted or no signal, replace it with a new one.
7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
NO
SOUND
There is no sound output in the TUNER FUNCTION, repair the set according to the following guide.
Check and replace IC202, TU801 on MAIN board.
1) Check if TUNER_LR is entered from Pin1 & 3 of TU801 to IC202(Pin23, 24).
If no signals, Check +3.3 V for Tuner power.
Check if the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC101 to TU801.
If it doesn’t work, replace TUNER with a new one.
2) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S audio signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
There is no sound output in the TUNER FUNCTION, repair the set according to the following guide.
Check and replace IC202, TU801 on MAIN board.
1) Check if TUNER_LR is entered from Pin1 & 3 of TU801 to IC202(Pin23, 24).
If no signals, Check +3.3 V for Tuner power.
Check if the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC101 to TU801.
If it doesn’t work, replace TUNER with a new one.
2) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S audio signal flow from IC501 to IC600. (Refer to Item 6-1.)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
NO
SOUND
There is no sound output in the MIC IN FUNCTION, repair the set according to the following guide.
Check and replace IC508, IC506 on MAIN board.
How to troubleshoot
1) Check MIC_SIG signal to Pin6 of CN506.
If no signal, Check the signal to Pin6 of CN3M01 on the MIC board.
Check if the signal is entered from Pin6 of CN3M01 to MAIN board.
2) Check if MIC_SIG is entered from Pin6 of CN506 to Pin3 of IC506 (MIC AMP).
3) Check if the amplified signal is entered from Pin4 of IC506.
If no signal output, check +12 V for IC506, replace IC506 with a new one if it has a problem.
4) Check if MIC_BCK, MIC_MLCK & MIC_LRCK is entered from IC501 to IC508.
Check if MIC_DATA is entered from Pin9 of IC508 to Pin7 of IC600.
If no signal, check +5 V & +3.3 V for IC508. If it is abnormal, change replace it a new one.
5) Check the following I2S signal flow from IC508 to IC600.
If there is any trouble; check the power for each IC. If the signals are abnormal, replace it a new one.
6) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
There is no sound output in the MIC IN FUNCTION, repair the set according to the following guide.
Check and replace IC508, IC506 on MAIN board.
How to troubleshoot
1) Check MIC_SIG signal to Pin6 of CN506.
If no signal, Check the signal to Pin6 of CN3M01 on the MIC board.
Check if the signal is entered from Pin6 of CN3M01 to MAIN board.
2) Check if MIC_SIG is entered from Pin6 of CN506 to Pin3 of IC506 (MIC AMP).
3) Check if the amplified signal is entered from Pin4 of IC506.
If no signal output, check +12 V for IC506, replace IC506 with a new one if it has a problem.
4) Check if MIC_BCK, MIC_MLCK & MIC_LRCK is entered from IC501 to IC508.
Check if MIC_DATA is entered from Pin9 of IC508 to Pin7 of IC600.
If no signal, check +5 V & +3.3 V for IC508. If it is abnormal, change replace it a new one.
5) Check the following I2S signal flow from IC508 to IC600.
If there is any trouble; check the power for each IC. If the signals are abnormal, replace it a new one.
6) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
NO
SOUND
There is no sound output in the BLUETOOTH FUNCTION, repair the set according to the following guide.
Check and replace IC501 on MAIN board and Bluetooth module on front panel.
How to troubleshoot
1) Check BT_RX, BT_TX signal to Pin5, 7 of CN504.
If no signal, check the signal to Pin5, 7 and Pin1(+3.3 V) of on the Bluetooth module and cable connection state.
If there are no signal out from module, replace new module.
2) Check if BT_RX/TX is entered from Pin5, 7 of CN504 to Pin169, 170 to IC501 (DSP).
3) Check if MIC_BCK, MIC_MLCK & MIC_O_DATA is entered from IC501 to IC600.
If no signal, check VCC12(+1.2 V) for IC501. If it is abnormal, change replace it a new one.
4) Check the following I2S signal flow from IC501 to IC600.
If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
There is no sound output in the BLUETOOTH FUNCTION, repair the set according to the following guide.
Check and replace IC501 on MAIN board and Bluetooth module on front panel.
How to troubleshoot
1) Check BT_RX, BT_TX signal to Pin5, 7 of CN504.
If no signal, check the signal to Pin5, 7 and Pin1(+3.3 V) of on the Bluetooth module and cable connection state.
If there are no signal out from module, replace new module.
2) Check if BT_RX/TX is entered from Pin5, 7 of CN504 to Pin169, 170 to IC501 (DSP).
3) Check if MIC_BCK, MIC_MLCK & MIC_O_DATA is entered from IC501 to IC600.
If no signal, check VCC12(+1.2 V) for IC501. If it is abnormal, change replace it a new one.
4) Check the following I2S signal flow from IC501 to IC600.
If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.
If AMP is damaged, replace it with a new one.
AUDIO
OUTPUT IS SMALL OR NO AUDIO OUTPUT
Audio signal output is small or not. when you power on the Middle Power Mini System.
Check and replace IC700 ~ IC706 & IC708 on MAIN board.
How to troubleshoot
1) Please check if this system is on bass blast mode.
RL and RR make sound only on bass blast mode.
2) Check the IC700 ~ IC706 & IC708 on your eyes.
3) Check the audio signal output check (Pin13 of IC700 ~ IC706 & IC708).
First, check the PWM Data input (Pin3 pin of IC700 ~ IC706 & IC708).
4) If the audio signal output has no output, try to change IC which has no output.
5) Lastly, check Speaker Terminal (CN702, CN703)
Audio signal output is small or not. when you power on the Middle Power Mini System.
Check and replace IC700 ~ IC706 & IC708 on MAIN board.
How to troubleshoot
1) Please check if this system is on bass blast mode.
RL and RR make sound only on bass blast mode.
2) Check the IC700 ~ IC706 & IC708 on your eyes.
3) Check the audio signal output check (Pin13 of IC700 ~ IC706 & IC708).
First, check the PWM Data input (Pin3 pin of IC700 ~ IC706 & IC708).
4) If the audio signal output has no output, try to change IC which has no output.
5) Lastly, check Speaker Terminal (CN702, CN703)
NO
POWER ON (STANDBY LED IS BLINKING)
Check and replace Q700 ~ Q705, Q708, Q709, Q714, Q716, Q719 ~ Q724 on MAIN board.
How to troubleshoot
1) This symptom occurs, when DC protection is detected. Main reasons are like below.
When Some of AMP FETs dead.
Check and replace Q700 ~ Q705, Q708, Q709, Q714, Q716, Q719 ~ Q724 on MAIN board.
How to troubleshoot
1) This symptom occurs, when DC protection is detected. Main reasons are like below.
When Some of AMP FETs dead.
Notice
for FET service
In case of RF6775, Metal case, FET Drain, has electric potential. So be careful when you deal with it.
In case of RF6775, Metal case, FET Drain, has electric potential. So be careful when you deal with it.
You
can see FET after removing heatsink.
Notice for Service
Before repair Main Assy, you need to discharge SMPS.
After then, open the connector.
You should try to change both of +/- FET and Driver IC as a pair.
Notice for Service
Before repair Main Assy, you need to discharge SMPS.
After then, open the connector.
You should try to change both of +/- FET and Driver IC as a pair.
SPEAKER
NO AUDIOAMP IC:
Check and replace the component on MAIN board.
How to troubleshoot
1) Check supply voltage of AMP(CN700, CN701) & PWM signal
Normal Supply voltage and signal. Check AMP IC.
Poor supply voltage Ö Check SMPS Assy.
Poor signal. Check PWM IC.
2) Check CSD of FET driver IC (IRS2092 : EAN60778301).
CSD has about 5 V on normal state. When AMP has problem, CSD is LOW state or keep change LOW to HIGH.
