LG 42LG30 (CHASSIS:LA85D) Service Manual ▷ View online
- 17 -
Analog TV Video
Check RF Cable
Check CVBS signal
TU400 #16 Pin
Replace Tuner(TU400)
Y
N
Check Tuner 5V Power
IC710 #3 Pin
Replace IC710
Y
N
Check IIC Line
Check other IC (ex : LGDT, NTP, I/O)
Y
N
Check Mstar LVDS output
Replace Mstar(IC100)
N
Y
- 18 -
Component Video
Check input signal format
Is it supported?
Check signal
C1708, C1709, C1710
C1711, C1712, C1713
Replace it.
Check signal IC903 output
R990, R991, R993
Y
N
Check JK900 / JK901
Replace Jack
Y
N
Y
Replace IC903
N
Y
Check Component Cable
Check Mstar LVDS output
Replace Mstar(IC100)
N
Y
- 19 -
RGB Video
Check input signal format
Is it supported?
Check signal, Hsync, Vsync
R633, R634
Check other set.
If no problem, check signal line.
Check R/G/B signal
R640, R641, R642
Y
N
Check JK605
Replace Jack
Y
N
Y
Check other set.
If no problem, check signal line.
N
Check RGB Cable conductors for
damage
Y
Check Mstar LVDS output
Replace Mstar(IC100)
N
Y
- 20 -
AV Video
Check input signal format
Is it supported?
Check signal
C635 (Composite), C634 / C633 (S-Video)
(Rear)
R615 (Composite) (Side)
Check other set.
If no problem, check signal line.
Y
N
Check JK600 (Rear)
Check JK602 (Side)
Replace Jack
Y
N
Check AV Cable / S-Video Cable for
damage or open conductors
Y
Replace Mstar(IC100)
Y
Check Mstar LVDS output
N
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