TCL CTR1042 User Manual

Colour Television Chassis: M123A
35
5. Faultfinding and Test Point with Waveform Diagram
5.1 Faultfinding
No raster +
B Voltage OK
Is the voltage
of in 25 of
IC201 3.3v
Is the resistance
to earth of pin25
if IC201 ok
No
Ye s
Is the H-out
waveform at PIN
13 of IC201 OK?
Ye s
Check the waveform
at static working
point of Q401.
Ye s
Check Q402
and LOT
No
Replace
IC201
NO
Ye s
Replace IC201 Replace Q401
Is the output
voltage of IC401
9V?
Check R233,C231
and C233
yes
No
Figure3 No Raster, +B OK
No
No
No picture, dense
noise dots
Is the antenna feed line
or the adapter broken
or unsoldered?
Handing the antenna
fault
Y
es
No
Is the signal at
Pin41, Pin42 of
IC201 ok?
Is the signal at IF
pin of the tuner
Is the signal at Pin
SCL, SDA of tuner ok?
No
Check signal at P57, P58, of
IC201 and replace the
abnormal relative circuit
Ye s
Check EEPROM
Y
es
Check/Replace
I
C
2
0
1
Y
es
Is the supply
volta
g
e of tuner
No
Check/Replace
power supply
circuit
Y
es
Check/Replac
e Tuner
Y
es
Check the relative
circuit of Q101,
Z101 etc
Figure 4 No Picture dense noise dots

TCL CTR1042 Specifications

General

Brand	TCL
Model	CTR1042
Category	TV
Language	English