Lcd Electrical Troubleshooting Guide - LG DP271, DP271B, LPA-837 Service Manual

LCD ELECTRICAL TROUBLESHOOTING GUIDE

Display condition?
YES
Fuse normal?
YES
IC(U1) normal operate
YES
7.5V, 15V, -10V normal?
YES
+5V normal?
YES
RGB signal output?
YES
VCOM signal? (4.5V)
Appear shadow form
interference in black background
NO
NO
NO
IC(U1) Check and Replace
NO
NO
IC(U901) Check and Replace
NO
Check and Replace
MPEG1389. (Pin : 184, 185, 187)
NO
IC(U902) and Replace
3-3
Inverter abnormal
Fuse Replace
D907, D901, D902
Main B/D on located