LG RT-29FA35RB, Service Manual, Page: 14 / 33

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No Picture / No Sound
Is any OSD displayed?
Check receiving system in MENU
& execute Auto - Program.
Does the auto - Program
Operate properly.
Store on manual - program MENU
Check / Replace
CPT Board component
Go to
No Sound /
Picture OK
Check IC11 pin71,72,73
(R,G,B out)
No
No
OK
OK
OK
OK
Check pin40(V out 1)
1V
p-p
Check 1.8V, 3.3V,
5V DC Voltage
No
Check SMPS Trans
Secondary Voltage
Q501, Q503, Q504
(R, G, B out of IC11)
No
No
Check pin18
Reset Voltage
OK
Check IC13
(Reset IC)
No
Check pin57, 58
SCL, SDA
OK
Check IC12(EEPROM)
& SCL, SDA, Line
No
Relace IC11
OK
3.3V swing
3.3V DC