Sharp Aquos LC-32G4U, Service Manual

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28
LC-32G4U/G4D
LC-37G4U/G4D
A
data bit is missing.
When P
A
TTERN1 is selected from
the adjustment process menu and it is set to 2, is the gradation pattern displayed correctly?
Connect SC4651 and SC4652, and check the IC4501 peripheral circuit.
When P
A
TTERN1 is selected from
the adjustment process menu and P
A
TTERN3 is set to 1, is the
gradation pattern displayed correctly?
Check IC4702, IC4902, and their peripheral circuits.
When P
A
TTERN3 in the adjustment
process menu is set to 4, is the pattern correctly displayed at one- dot intervals?
Check between IC4701 and IC4501.
When P
A
TTERN3 in the adjustment
process menu is set to 5, is the pattern correctly displayed at one- dot intervals? Check the IC2206 peripheral circuit.
Check between IC4901 and IC4501.
No
Ye
s
No
Ye
s
No
Ye
s
Ye
s
No
When the QS driver is activated, noise is seen in the images.
Check IC4701, IC4901, and the peripheral circuits.
Are the GND1 PWB and the LCD CONT
PWB properly connected
with a cable? Is the OSTEMP
AD value on the
third page of the process adjustment mode set to 255?
Connect them properly or replace the cable.
Are the GND1 PWB and the GND2 PWB properly connected with a board-to-board connector?
Connect them properly
.
Is 5V present at pin 62 on IC2004 (the microcomputer)? The thermistor on the GND2 PWB is defective.
Pin 62 on IC2004 is defective.
No
Ye
s
No
Ye
s
No
Ye
s
Ye
s
No
The backlight does not light.
Has the fuse for F7401 or F7501 blown?
Check the circuits after replacing the fuse.
Is power supplied to each inverter PWB?
Is the control signal being output at pins 3, 4, and 5 of P7705 on the LCD CONT
PWB?
Check the fluorescent lamp connector and the inverter circuit.
See if the cable is connected between PWBs.
Check the IC4501 peripheral circuits.
Ye
s
Ye
s
Ye
s
Ye
s
No No
No