Read LG 55LEX8-SA (CHASSIS:LJ03S) Service Manual online
8. Trouble shooting - No video (FRC - TM480Hz with 3D FPGA)
Check 4Ch DC-DC Converter IC Output
ok
Check LG1120 Input Signal(60Hz)
Check LG5111 Output Signal
Check LG1120 Output Signal(240Hz)
Check 240Hz T-con IC Output Signal
Check X-Tal Output(X100, 25MHz)
Check 12V Power
L902, L903
ok
ok
ok
ok
No
No
No
Check Input Voltage
-. 3.3V(L401, L501)
-. 1.8V(L400, L500)
-. 1.8V(L400, L500)
T-con B/D 12V Line
Short Check
No
Check 24V Line Check
C1316, C1317
ok
Check FFC Cable(80P, T-con to Module)
ok
Check P-Gamma Data
Change Module
ok
Replace T-Con B/D
ok
Check LG1120 I2C Line
ok
Check Input Voltage
-. 3.3V(L104)
-. 2.5V(L309)
-. 1.0V(L303)
-. 2.5V(L309)
-. 1.0V(L303)
ok
ok
Replace LG1120
(IC102)
Check T-con IC I2C Line
ok
ok
Replace T-con IC
(IC400 or IC500)
No
Check DC-DC Output Voltage
-. VGH / VGL / VCC
No
Replace T-con B/D
(Output voltage setting is different for each model)
No
Check P-Gamma IC
VCC Input (L800)
ok
Check P-Gamma IC
I2C Line
Check output Data
ok
Replace P-Gamma IC
(IC801)
No
Check FPGA(IC11400) Output Signal(240Hz)
Check X-Tal Output
(X11400, 54MHz)
ok
No
Check FPGA I2C Line
ok
ok
ok
Replace FPGA
(IC11400)
Check Input Voltage
-. 2.5V(IC303, 6pin)
-. 1.2V (L308)
-. 1.2V (L308)
Check STDP4020 Output Signal
No
Click on the first or last page to see other 55LEX8-SA (CHASSIS:LJ03S) service manuals if exist.