LG L15V26 Training Manual page 32

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
Green Gain 155
Blue Gain 139
No raster
Standby
voltage check :
D_board P1401
PASS
Measure
Standby voltage :
A_board P804 7th 6V
PASS
Measure
Standby voltage :
A_board P801
2 nd pin 5V
PASS
Measure
D_board supply voltage :
P1401 1th pin 3V
8th 6V, 10th 12V
PASS
Measure
module T-con voltage :
D_board C933 12V
PASS
Measure
Analog supply :
A_board P804 7th 6V,
10,11th 3.3V
Directview LCD Training
Red Offset 54
Green Offset 45
Blue Offset 58
FAIL
5th 6V
FAIL
Replace A_board
FAIL
FAIL
Replace D_board
FAIL
Replace A_board
FAIL
Check No power
(Go to No power)
PASS
Check No power
(Go to No power)
PASS
Check No power
(Go to No power)
PASS
32
Replace D_board
Replace A_board
Replace D_board
Circuit Descriptions