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No picture with "VIDEO1"
S-VIDEO input source
No
No picture with
"VIDEO1/2/3" Video
input source
No
No picture with TV input
source
Yes
Check AV source selecting stage;
S-video signal (Y/C) is selected in IC3001(Selector IC) and sent to
IC3101 and then decoded to component signals.
S_SW signal (S-Video cable is connected:L) is applied on pin 7 of
IC3001, and S_Video source has priority over Video source.
--> Check S-video signal (Y/C) on IC3001 and IC3101, and peripheral
circuit.
The stage after IC3101 is the same route as Component source.
Yes
Check AV source selecting stage;
Composite video signals(Input_1/2/3) are sent to IC3001 and selected
signal is sent to IC1101 (3D-Y/C sep. & DNR IC).
IC1101 is performed 3D-Y/C for NTSC and 3L-Y/C for PAL.
Y/C separated signals are sent to IC3101, and then decoded to com-
ponent signals.
--> Check IC3001, IC1101, IC3101, and peripheral circuit.
The stage after IC3101 is the same route as Component source.
AV_H/V_SYNC signals are output from IC3101 and sent to IC6301,
sync separated signals HS/VS_AV from IC6301 are sent to IC1201.
H/V_AD signals output from IC1201 are sent to IC2201.
--> Check sync signals at test points TP-H/V_AD.
Y
Yes
Check TV source processing stage;
V
RF signal is converted to IF signal in A201 (TUNER).
IF signal is sent to IC201(VIF/SIF IC) through SAW filter X202.
Composite video signal from IC201 is sent to IC3001.
--> Check IC201 and peripheral circuit
OSD_R/G/B signals from IC8504 (TV CPU) are sent to IC3101 and
super-imposed in IC3101.
The stage after IC3101 is the same route as Video input source.
If no OSD --> Check OSD_R/G/B form IC8504 to IC3101.
If snow noise or saturated picture appears --> Check IC201 and peripheral cir-
- 85 -
Troubleshooting
cuit and RF AGC adjustment.
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