LG L15V26 - 32 Video Troubleshooting

Directview LCD Training 32 Circuit Descriptions
CIRCUIT DESCRIPTIONS
32” VIDEO
TROUBLESHOOTING
No video/Audio ok
Problem: Audio but no video.
Resolution: If the backlight is turning on, then most likely the problem is with the main PCB or LCD
driver. If the backlights don’t turn on, the ballast or lamps are most likely the problem.
Slow motion/Ghosting
Problem: Intermittent slow motion on analog.
Resolution: Install firmware version 3.18 or newer or replace main PCB.
Green Tint on Component
Problem: Bad color or green tint on component inputs.
Resolution: Install firmware version 3.18 and then adjust color settings in the service menu. Write
down original settings in case you need to return to those. Make sure you are in component input
mode before entering the service menu. Some recommended color settings for component:
Red Gain 139 Red Offset 54
Green Gain 155 Green Offset 45
Blue Gain 139 Blue Offset 58
No raster
Replace D_board
Standby
voltage check :
D_board P1401
5th 6V
Check No power
(Go to No power)
Measure
Standby voltage :
A_board P804 7th 6V
Measure
Standby voltage :
A_board P801
2 nd pin 5V
Measure
module T-con voltage :
D_board C933 12V
FAIL
Replace A_board
Replace A_board
Check No power
(Go to No power)
FAIL
Replace D_board
Check No power
(Go to No power)
FAIL
FAIL
Replace D_board
FAIL
Measure
Analog supply
:
A_board P804 7th 6V,
10,11th 3.3V
Replace A_board
FAIL
PASS
PASS
PASS
PASS
PASS
PASS
Measure
D_board supply voltage
:
P1401 1th pin 3V
8th 6V, 10th 12V
PASS
PASS