Read LG 42LG70YD (CHASSIS:LJ83A) Service Manual online
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Check RF Cable
Check TP Clock, Data, Sync
R853 (38.1MHz), R804, R803
Check RF signal, PLL locking…
Maybe Tuner(TU800) has problems
Check BCM3553(2) Output TP Clock,
Data, Sync
R153, R155, R152
Check BCM7412 Clock, Hsync, Vsync
R1088 (Typ. 74.25MHz), R1087, R1086
Y
Y
N
Check Tuner 5V, +2.5V, D3.3V Power
TU800 #1,2,3 Pin
Power Problem
Y
N
Y
Maybe BCM3553(2)(IC100) has problems
N
Maybe BCM7412(IC1000) has problems
N
Check PLD Clock, Hsync, Vsync
R1102 (Typ. 74.25MHz), R1100, R1101
Y
Redownload PLD file or replace
N
Maybe BCM3553(2)(IC100) has
problems
Y
Check BCM7412 Input Clock
R107 (27MHz)
Replace it
N
Y
3. Digital TV Video
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