Colour Television Chassis: M123A
39
Symptom:
Tuning Control
doesn’t work
Press
STANBY key
on R/C. Can
the TV be
turn on and
turn off?
Does the channel
number display
on the screen?
Yes
No
Start auto-
search. Is the
BUS ok?
Yes
After auto-search, Can
the searched program
be memorized?
Is the voltage at
P9 of IC201ok?
Replace IC201
Yes
Yes
Check/5V
power supply.
No
No
Is there sync
pulse at P62
of IC201?
No
Check the power
supply of IC201.
Are there H & V
flyback pulses at
P12 of IC201
No
No
Check
R408,R406,D404,C422
Yes
Check/Replace
IC201
No
Check the
waveform
at Pin57,
Pin58 of
IC201
No
Yes
Is the
+33V/+5
VA power
supply
ok?
Check/33V
power supply
No
Yes
Is there the
short circuit
around the
integration
circuit?
Check/Replace
the tuner
No
Check/Repair
the integration
Yes
Figure 9 Tuning Control doesn’t work
ķ
Is there sync pulse at B
of Q003?
Replace Q003
Yes
Check Q210, Q211
and the peripheral
circuit.
No
Yes
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...
