SHARP 32HW53 SERVICE MODE AND TROUBLESHOOTING

SHARP 32HW53 service mode and Troubleshooting

SHARP 32HW53 

SERVICE MODE
The service mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted in the set.
Note that these adjustments may vary from one receiver to another.
To enter the service mode, carry out the following procedure.
1. Connect a test pattern to the antenna terminal.
2. Tune the receiver to this signal.
3. Turn the receiver off using the mains switch.
4. Press volume down and channel up buttons on the front of the receiver at the same time.
5. Keeping these buttons pressed, turn the mains on.
6. When the set starts up it will be in service mode.
7. Release the two buttons.
Use the channel up and down buttons to move between the options.
Use the volume control buttons to change the data.
To store the data, use the stand-by button on the remote control.
To exit the service mode, turn the receiver off using the mains switch.

AGC Adjustment
To correctly align the Automatic Gain Control, follow the procedure outlined below:
1. Tune the set into a pattern generator on CH10.
2. Adjust the signal strength of the pattern generator to 57uV
3. Enter the service mode.
4. Enter the AGC Adjustment menu.
5. Press the standby button on the remote control.
6. The adjustment will be carried out and stored automatically.

AFT Adjustment
To correctly align the Automatic Fine Tune, follow the procedure outlined below:
1. Tune the set into a pattern generator on CH69.
2. Enter the service mode.
3. Enter the AFT Adjustment menu.
4. Press the standby button on the remote control.
5. The adjustment will be carried out and stored automatically.

 1.SYMPTOM 

Set shuts down at start up (EHT sometimes comes up, but then the set shuts down). This can be intermittent. Once the set has started up, it will run until the mains is removed.
CAUSE 

Dry joints on IC2402. This IC is mounted on the print side of the PWB, underneath the Teletext Processor (IC2401). Note that IC2402 may not be fitted on some sets.
ACTION 

Resolder all pins on IC2402.

2.SYMPTOM 

Ragged verticals at the top and bottom of the screen
CAUSE 

C528 (10uF 63v)
ACTION 

Replace component

3.SYMPTOM 

During the sub-title mode the set may intermittently revert to page 100. This may happen after changing channels or while watching a particular channel for any length of time.
ACTION 

Please change the EEPROM software as detailed in the table below.

REF NO	DESCRIPTION	PART NUMBER	FILE VERSION	PRICE CODE
IC 1002	EPROM SET 4M 3V FLASH 28HW53H	CH-IX1841CJH0	H0-00x25	AM
IC 1002	EPROM SET 4M 3V FLASH 56FW53H	CH-IX1841CJH5	H9-04x07	AM
IC 1002	EPROM SET 4M 3V FLASH 66FW53H	CH-IX1841CJH3	H5-04x07	AM
IC 1002	EPROM SET 4M 3V FLASH 66GF63H	CH-IX1841CJH7	H7-02x04	AM

4.SYMPTOM

Low Scart Input levels after replacing the NVM
ACTION 

Re-write the data as shown below in the NVM

Page 08 Address 60 Value 00

Page 08 Address 61 Value 2A

5. SYMPTOM

Failure of Q601 and/or Q506
CAUSE

Dry joints on C613
ACTION

Clean and resolder legs on C613. In severe cases arcing from the joint may have caused failure of R610 and L603 in addition to the transistors Q601 and Q506. If Q506 runs very hot when replaced L603 must be changed.

Q601 Transistor Line o/p RH-TX0144BMZZ

Q506 Transistor E/W RH-TX0151BMZZ

L603 Coil RCILP0286BMZZ

R610 Safety Resistor RR-XZ0200BMZZ

6.SYMPTOM

RGB lines at top of screen / picture brightness ramps up to white screen or down to black screen.
CAUSE

A number of faults can cause the above symptom. 1. Corrupt NVM data. 2. Incorrect compensation of the RGB signal due to errors in the sense feedback circuitry. This can be due to Q912 being leaky. 3. Incorrect setting of the screen control on the line output transformer.
ACTION

Take action as required. 1. Reflash the NVM with the default data from this site – ensuring the correct data is applied for the CRT type and Device permutations (see CTV 2002 04 01) 2. Replace Q912 with correct type (this is imperative) 3. Set up the screen setting (G2) as per the bulletin CTV2000 01 04.

Notes: If Q912 gets hot during operation fit a 68Ω, 0.5W resistor on the print side of the PWB between the collector and emitter of this device. Use part number VRD-RA2HD680J to obtain the resistor.

# Although Q912 may read correct, replacement is recommended where intermittent picture problems have been reported.

# The RGB lines at the top of the screen are a definite indicator of NVM corruption (unless a clear frame foldover has occurred).

# The picture brightness will appear to correct itself in service mode.

# In some severe cases the RGB driver IC1801 may need to be replaced. 

REASON

 Simplified procedure for the G2 and Grey Scale adjustments.
ACTION

Follow the procedure below to set the G2 and Grey scale.
1. Tune the set to the output of a RF signal generator.
2. In the user menu, set the picture levels to the FACTORY settings.
3. In the user menu, set the tint control to its central position.
4. Enter the test mode (see the service manual for procedure).
5. Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read
80. Store each location by pressing the standby button on the remote control.
6. When the ABL levels have been set, adjust the G2 and grey scale (if necessary).

Grey Scale Adjustment
i. Using a grey scale pattern set the Red Cut-off value to 32 and the Red Gain value to 50.
ii. Leave the Red Cut Off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve
correct grey scale tracking. As with all grey scale adjustments it will be necessary to re-adjust the
settings to achieve good tracking.
Notes
1. There is no need to store any of the gain or drive settings.
2. When adjusting the grey scale, the figures displayed in the boxes are an indication of the CRT’s performance only.
3. These adjustments are for guidance only. If any problems should be encountered the adjustments should be carried out using a Colorimeter as explained in the service manual.

7. SYMPTOM

 Volume goes up when a non-Sharp (e.g. SKY) remote is used in the vicinity
ACTION

 Replace software (IC1002)
Take care to note the CRT maker, the Device type fitted as IC1002 and also the device used for IC801

8.SYMPTOM

Set fails to come on (HT present), Text position incorrect, AV audio levels low or other peculiar symptoms associated with software CAUSE Possible Data corruption to the NVM, or poor default values written after blanking or
replacement.

ACTION

1. Reflash the NVM with the default data from this site – ensuring the correct data is applied for the CRT type and Device permutations.

9.SYMPTOM

IC1300 on the centre speaker PWB runs hot or the set is dead set due to IC1300 or IC1302 causing a short circuit on the +/-16V supplies.
ACTION

Carry out the following as necessary.

1. Add jumper wires JL2 and JL3

2 below to reduce the running temperature of IC1300. 2. Check IC1302 for short circuit across the supply and replace as necessary.

3. Check for and if necessary re-solder dry joints on C1306.
4. Also check the condition of IC1300 and replace if necessary.
Notes 

1. If the track is cut below IC1300 and jumper link JL1 is fitted it is not necessary to carry out the modification.

2. There are two versions of this PWB. Pro Logic models are not fitted with IC1300.

3. In the case of a dead set, caused by short circuit IC1300, it is possible to run the set by completely disconnecting the centre speaker PWB.

10. SYMPTOM

Set Resets whilst being watched or Switches on from Stand-by on its own.
CAUSE

Problem with Slave microprocessor ON TIMER function.
ACTION

Remove the parts listed below (IC701, R708, and C728).

Faults in the East/West Circuit
When fault finding in the east/west circuit, it is important to ascertain in which part of the circuit the fault lies. Check the control output of IC801 – pin 32. There should be a parabola waveform on this pin at a base frequency of 50Hz. It will change wave shape depending upon the amount of correction applied, so it is important to enter the service mode and ensure that none of the adjustments are at minimum or maximum.

If this waveform is present, and changes as adjustments are made, then the fault will lie in the drive or output circuitry. Faults in this area include:
1. R519 going high or open circuit – it is a 100kΩ connected to the 150V supply.
2. Q506 going short, open or overheating – change L603, L604, D502, D503, D504, D516 and C528.
3. D603 and D604 going open or short-circuit.
4. Dry joint on C601 and/or C610.
If the waveform is not present, or is severely distorted, or the adjustment range is poor, then the fault could be caused by the memory IC – IC1003 or the VDP - IC801. It is recommended that if this is the case, then the NVM is blanked or re-flashed first. If this does not cure the problem, then it is probable that IC801 is at fault. Sometimes it will not be possible to set the geometry correctly in all modes after blanking he NVM. In this case it will be necessary to ensure that the EPROM (IC1002) is correct (see CTV2001 05 04). When the correct EPROM is fitted, the NVM will have to be blanked to enable the correct information to be downloaded into it. Replacement EPROM’s have been produced so that minimal geometry adjustments are required. If the picture geometry is very poor after following the above procedure, the fault will be elsewhere in the east/west circuitry.