TCL 21F1 NX56E-LA - Sound and Picture Issues

Colour Television Chassis:
No
Is it mute at
Pin 7 of
IC601?
Ye s
No sound
Is the speaker OK ?
Replace the speaker
Apply the pointer of multimeter at
RX1K
¡
connect one probe to
GND, use another to touch P12, P4
of IC601, Is there interference noise
from the speaker.
No
Check power
supply of
IC601
Ye s
Is the waveform
at P57 P58 of
IC201 ok?
Ye s
Replace
IC601
Check/Replace
Q602,Q600.
No
Figure 4 No Sound
No raster +
B Voltage OK
Is the voltage
of Pin8
IC202 5v
Is the resistance
to earth of pin8
if IC201 ok
No
Ye s
Is the H-out
waveform at PIN
56 of IC201 OK?
Ye s
Check the waveform
at static working
point of Q402.
No
Replace
IC201
NO
Replace IC201 Replace Q402
No
Figure3 No Raster, +B OK
Ye
NO
Replace IC201
Ye s
Check the circuit between
IC601 and IC201
NX56