Electrical Troubleshooting Guide; Smps Troubleshooting Flow - LG DP122NU Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS TROUBLESHOOTING FLOW

No +5 V
Is the
F501(T2AL) normal?
Is the D501/D502/D503/D504
normal?
Is the
U1(TNY176)
normal?
Is the D509
normal?
Is there
about 2.5V at the
U503 Pin1?
Is the U502
normal?
Power line of main
PCB(DVD) is short
YES
YES
YES
YES
YES
YES
YES
NO
(Use the same ICW)
NO
the D501/ D502/ D503/ D504
NO
NO
NO
NO
3-9
Replace the F501
Replace
Replace the U1
Replace the D509
Replace the U503
Replace the U502