LG L15V26 - 32 Power Supply Troubleshooting

Directview LCD Training 31 Circuit Descriptions
CIRCUIT DESCRIPTIONS
No power
O.K
Connect the connectors
Replace Power_board
Replace the Power_board
Replace D_board
Push the POWER ON key
Check
the condition of power
Related connectors.
Measure the
stand_by voltage :
D_board P1401 5 th pin
ST_ 6V
Measure D_board
Standby voltage:
D_board P1401 8th
6V
Dose the set turn
on normally?
Check
Power_board
analog ref. voltage
A_board P801
1th pin 24V
Measure Power
On signal level :
A_board P801 2nd
pin > 5V
Measure D_board
supply voltage :
P1401 1th pin 3V 8th
6V, 10th 12V
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
FAIL
PASS
PASS
PASS
PASS
PASS
Replace Power board
Check the
power board
Digital ref. voltage :
Power board CN804
1th pin 24V
No Digital TV (Cable or OTA)
Problem: Snow on all digital cable and OTA channels.
Resolution: Check the digital tuner on the digital tuner PCB. Check circuitry and connections,
replace the PCB if necessary.
32” POWERSUPPLY
TROUBLESHOOTING
General Troubleshooting
Problem: Doesn’t go into standby mode (no red LED)
Resolution: Check power supply circuity (and fuse).
Problem: LED blinks but stays red after pressing power.
Resolution: Check power supply or main PCB. Power supply is trying to turn on but doesn’t receive any
feedback from the TV, so it turns back off.
Problem: LED blinks green but then goes back to red.
Resolution: Check fan.