Colour Television Chassis: M123A
38
Check P25, P49 of IC201
and the relative circuit
No Picture
TV&AV
haven’t
Picture
Check RGB signal
Check +9V,
+200V
Ok
Check
Q501~Q503
Check R516 ~
R521 etc.
No
Ok
Replace IC201
TV has Picture. AV hasn’t Picture.
Check the waveform of
pin 14 of IC901
No
Q905 and its peripheral circuit
No
Check Pin61 of IC201
and peripheral circuit
Check the logic of
Pin9 Pin10 of IC901
Yes
Replace IC901
Yes
AV has Picture. TV hasn’t Picture.
Is the waveform at
P30 of IC101 ok?
Check Q208, Q209
and peripheral
circuit
Yes
Check IC201 and relative
circuit. please reference
the previous page named
Figure 5.
No
Figure 8 No Picture
5. Faultfinding and Test Point with Waveform Diagram
5.1 Faultfinding
Summary of Contents for CTR1042
Page 41: ...Colour Television Chassis M123A 41 6 Block Diagram and I2C 6 1 Block Diagram...
Page 49: ...Colour Television Chassis M123A 49 7 Electrical Diagrams 7 10 CRT Panel...
Page 52: ...Colour Television Chassis M123A 52 8 PCB 8 1 Main PCB...
Page 53: ...Colour Television Chassis M123A 53 8 PCB 8 2 CRT PCB...
Page 54: ...Colour Television Chassis M123A 54 8 PCB 8 3 MPX PCB...
Page 55: ...Colour Television Chassis M123A 55 8 PCB 8 4 SIDE AV PCB...
