DOWNLOAD Sharp LC-37GA5E (serv.man6) Service Manual ↓ Size: 142.87 KB | Pages: 14 in PDF or view online for FREE

Model
LC-37GA5E (serv.man6)
Pages
14
Size
142.87 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Tables
File
lc-37ga5e-sm6.pdf
Date
PREV: Sharp LC-37GA5E (serv.man5) Service Manual

Sharp LC-37GA5E (serv.man6) Service Manual ▷ View online

45
 LC-26GA5E
 LC-32GA5E
    LC-37GA5E
The backlight does not go on.
NO
YES
NO
NO
YES
NO
YES
YES
Inside the power supply unit: Has the fuse 
F705 1A on the inverter circuit burnt out?
Is power supplied to the INVERTER PWB? 
(Vin, 3.5VAC)
Are PWBs properly connected with 
harnesses?
(Power supply unit, INVERTER PWB, 
INVERTER-GND PWB, LCD 
CONTROLLER PWB)
Connect properly or replace harnesses.
Check the inverter circuit behind the burnt 
fuse.
Inside the power supply unit: Is each 
control signal sent to CN704? (Pin (11) of 
OFL1, pin (13) of INV.OSC)
Check the connectors of each fluorescent 
lamp and inverter circuit.
Check IC4501 (LCD CONTROL) and its 
peripheral circuits.
Troubleshooting Table (continued)
46
 LC-26GA5E
 LC-32GA5E
    LC-37GA5E
YES
YES
YES
NO
NO
No picture in the LCD section
Is the power supplied to the LCD CONTROLLER PWB? (P7707: +6/+4/+13V)
Check if the REG output -D3.3V_1/2 of IC7706/IC7704 (REG-IC) is sent properly.
Is the output signal of IC4601 (GAMMA) sent properly?
Check the FFC (LV, SC2201 - SC4601) between MAIN 
PWB and LCD CONTROLLER PWB and input circuit of 
IC4601.
NO
Check the connection between SC4651 and SC4652 and 
peripheral circuits of IC4501 (LCD CONTROL).
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second llayer of 
"LCD CONT" to "02"?
Check IC4902 (FIFO) and its peripheral circuits.
NO
Check IC4501 (LCD CONTROL) and its peripheral circuits.
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Data bit drop (gradation-related)
Noise is caused to the moving picture with the QS drive on.
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"?
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second layer of 
"LCD CONT" to "02"?
Check IC4601 (GAMMA) and its peripheral circuits.
NO
Connect the harness correctly or replace it.
YES
Check the video signal circuits (IC4501, IC4901, IC4601).
NO
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Is the harness connected correctly between the inverter GND 
PWB and LCD CONTROLLER PWB?
Is the input voltage at pin (62) (OS-TEMP) of IC2004 
(microprocessor) 5V?
The thermistor on the INVERTER GND PWB is faulty. Or 
check the peripheral circuits.
The whole screen is whitish (LCD power supply).
NO
YES
Disconnect the FPC from SC4651 and SC4652.  (To protect 
the panel against damage)
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"? (Is it whitish or dark?)
Check the power supply voltage supplied to the panel (check 
at SC4651 and SC4652).
Troubleshooting Table (continued)
46
 LC-26GA5E
 LC-32GA5E
    LC-37GA5E
YES
YES
YES
NO
NO
No picture in the LCD section
Is the power supplied to the LCD CONTROLLER PWB? (P7707: +6/+4/+13V)
Check if the REG output -D3.3V_1/2 of IC7706/IC7704 (REG-IC) is sent properly.
Is the output signal of IC4601 (GAMMA) sent properly?
Check the FFC (LV, SC2201 - SC4601) between MAIN 
PWB and LCD CONTROLLER PWB and input circuit of 
IC4601.
NO
Check the connection between SC4651 and SC4652 and 
peripheral circuits of IC4501 (LCD CONTROL).
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second llayer of 
"LCD CONT" to "02"?
Check IC4902 (FIFO) and its peripheral circuits.
NO
Check IC4501 (LCD CONTROL) and its peripheral circuits.
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Data bit drop (gradation-related)
Noise is caused to the moving picture with the QS drive on.
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"?
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second layer of 
"LCD CONT" to "02"?
Check IC4601 (GAMMA) and its peripheral circuits.
NO
Connect the harness correctly or replace it.
YES
Check the video signal circuits (IC4501, IC4901, IC4601).
NO
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Is the harness connected correctly between the inverter GND 
PWB and LCD CONTROLLER PWB?
Is the input voltage at pin (62) (OS-TEMP) of IC2004 
(microprocessor) 5V?
The thermistor on the INVERTER GND PWB is faulty. Or 
check the peripheral circuits.
The whole screen is whitish (LCD power supply).
NO
YES
Disconnect the FPC from SC4651 and SC4652.  (To protect 
the panel against damage)
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"? (Is it whitish or dark?)
Check the power supply voltage supplied to the panel (check 
at SC4651 and SC4652).
Troubleshooting Table (continued)
46
 LC-26GA5E
 LC-32GA5E
    LC-37GA5E
YES
YES
YES
NO
NO
No picture in the LCD section
Is the power supplied to the LCD CONTROLLER PWB? (P7707: +6/+4/+13V)
Check if the REG output -D3.3V_1/2 of IC7706/IC7704 (REG-IC) is sent properly.
Is the output signal of IC4601 (GAMMA) sent properly?
Check the FFC (LV, SC2201 - SC4601) between MAIN 
PWB and LCD CONTROLLER PWB and input circuit of 
IC4601.
NO
Check the connection between SC4651 and SC4652 and 
peripheral circuits of IC4501 (LCD CONTROL).
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second llayer of 
"LCD CONT" to "02"?
Check IC4902 (FIFO) and its peripheral circuits.
NO
Check IC4501 (LCD CONTROL) and its peripheral circuits.
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Data bit drop (gradation-related)
Noise is caused to the moving picture with the QS drive on.
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"?
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN1" in the second layer of 
"LCD CONT" to "02"?
Check IC4601 (GAMMA) and its peripheral circuits.
NO
Connect the harness correctly or replace it.
YES
Check the video signal circuits (IC4501, IC4901, IC4601).
NO
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
YES
Is the harness connected correctly between the inverter GND 
PWB and LCD CONTROLLER PWB?
Is the input voltage at pin (62) (OS-TEMP) of IC2004 
(microprocessor) 5V?
The thermistor on the INVERTER GND PWB is faulty. Or 
check the peripheral circuits.
The whole screen is whitish (LCD power supply).
NO
YES
Disconnect the FPC from SC4651 and SC4652.  (To protect 
the panel against damage)
Adjustment process menu: Is the gradation pattern displayed 
properly when setting "PATTERN2" in the second layer of 
"LCD CONT" to "1"? (Is it whitish or dark?)
Check the power supply voltage supplied to the panel (check 
at SC4651 and SC4652).
Troubleshooting Table (continued)
Page of 14
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