LG BD 690 BLU RAY POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING

LG BD 690 BLU RAY POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING

    POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING

NO POWER

No power problem occurs when you power on the unit.
F101, BD101, R101
Solution
How to troubleshoot (Countermeasure)
1) Look at the physical of fuse.
2) Check the bridge diode.
3) Check the R101 short or open.

NO POWER PROBLEM

No power problem occurs when you power on the unit.
C124
Solution
How to troubleshoot (Countermeasure)
Check all of voltage.

NOT DISPLAY OR NO BOOTING WHEN YOU TURN ON THE
POWER BUTTON

VFD does not display or no booting problem occurs when you power on the BD player.
IC301
SolutionPlease check and replace IC301 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check 5.3 VA of C213 (CN201).
Please check 3.3 VA of IC208 pin1.
2) Check the 1.2 V, 1.5 V, 3.3 V.
If 1.2 V, 1.5 V, 3.3 V voltage doesn’t come out,
check P_CON_5.3V1 (IC301 pin33) and P_CON_5.3L1 (IC301 pin32).
--> If you figure out those power control doesn’t come out any signal level (or voltage), please replace IC301 of MAIN board.
3) If X301 does not oscillate as the frequency of 12 MHz, first, check X301 and then replace IC301.
4) After changing it, if the set is still not booting, check MPEG IC(IC500). After changing it, if VFD is not displayed, check SMPS power (-29VA, FD+, FD-).

NO BOOTING WHEN YOU TURN ON THE POWER BUTTON

When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
IC601, IC602
SolutionPlease check and replace IC601, IC602 on MAIN board.
How to troubleshoot (Countermeasure)
1) please check 1.5 V of C651.
2) If 1.5 V voltage doesn’t come out, check P_CON_5.3V1 of IC301.
--> If you figure out those power control doesn’t come out any signal level (or voltage), please replace IC301 of MAIN board.
3) Check DDR3_VREF of C619, DDR3_VREF must be 0.75 V. If DDR3_VREF is not 0.75 V, check the R581 and R582.
4) If the set is still not booting, check DDR IC (IC601, 602).

NO BOOTING WHEN YOU TURN ON THE POWER BUTTON

When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
X501, IC500
SolutionPlease check and replace X501, IC500 on MAIN board.
 How to troubleshoot (Countermeasure)
1) Please check the soldering status of 27 MHz crystal (X501).
2) Please check the frequency of 27 MHz crystal (X501).
3) If the crystal doesn’t oscillate, replace X501.
4) After changing it, if the set is still not booting, check MPEG IC (IC500).

NO BOOTING WHEN YOU TURN ON THE POWER BUTTON

When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
IC603
SolutionPlease check and replace IC603 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check the IC603 on your eyes.
2) Check the /CE signal of pin9 of IC603.
First, If the /CE signal is not operating normally during booting, try to change IC603.
3) After changing it, if the set is still not booting, check MPEG IC (IC500) or DDR IC

AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

When disc is played, audio signal is small or audio output is not.
IC805
SolutionPlease check and replace IC603 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check the IC805 on your eyes.
2) Check the 1.2VRMS level of pin20 of IC805.
If the 1.2VRMS is OK, check C806 (VBIAS).
3) If the set is still no audio output, try to change IC805.