LG 29FU1RLX Service Manual page 18

4) No Picture/ No Sound
OK
Check IC501 pin 83,
84, 85 (R, G, B out)
NO
Check the waveform
pin73(H-out)
OK
P20A (R, G, B out of
IC501)
NO
NO
Check IC501 pin 83,
84, 85 (R, G, B out)
Check pin3 Reset
Voltage
Check pin7, 8 SCL,
SDA
Replace IC501
Is any OSD displayed?
Check receiving system in MENU
& execute Auto - Program
Does the auto - Program
operate properly
Store on manual -program MENU
NO
Check SMPS Trans
Secondary Voltage
OK
OK
NO
Check IC12(EEPROM)
& SCL, SDA, Line
OK
P20A (R, G, B out of
IC501)
- 18 -
OK
OK
OK
Go to No sound/
picture OK