Lcd Part; Lcd Electrical Troubleshooting Guide - LG DP450G Service Manual

LCD ELECTRICAL TROUBLESHOOTING GUIDE

Display condition?
YES
Fuse normal?
YES
+7.5V, 15V, -10V
YES
+5V normal?
YES
R G B signal output?
YES
VCOM signal?
(Vip 4.5)
YES
LCD MODE
CONT signal? All "LOW" (Normal
condition)
YES
TFT LCD
pressure voltage? +3.3V, +5V,
+15V, -10V
YES
TFT LCD normal?
YES
Color
adjusting normal?
YES
Each connector?
YES
END

LCD PART

Appear shadow form
interference in black background
NO
NO
NO
NO
IC(U2) Check and Replace
NO
Check and Replace
MPEG1389LP (Pin107, 108, 109)
NO
IC(U1) Check and Replace
NO
NO
Power source and
L909, L1, D1, D2 check
NO
NO
Readjust as adjustement standard
NO
Replace and Reassemble
NO
3-2
Inverter abnormal
Fuse Replace
D6, D1, D2
MAIN B/D Check
Replace
Replace