Philips 21PT5027/69 - Page 9

Service Modes, Error Codes, and Fault Finding
EN 9TC8.1A CA 5.
5.3.2 No Picture, No Sound, No Raster, B+ OK
Figure 5-2 Flow chart “No Picture, No Sound, No Raster, B+ OK”.
5.3.3 No Picture, Raster and Sound OK
Figure 5-3 Flow chart “No Picture, Raster and Sound OK”.
H_17130_011.eps
070507
No Picture, no sound, no raster, B+ OK
Check
5V supply
pin 9 of IC 201
OK?
Check
H out waveform
Pin 13 of IC 201
OK?
Check
waveform
C of Q401
OK?
Check
waveform
C of Q402
OK?
Is IC201
Pin9 shorted to
earth ?
Yes
Replace
Q401or R401
Yes
Replace
IC 201
Yes
oNoN
No
Replace
Q402
No
Check
+5V,+9V Circuit
No
Yes
H_17130_012.eps
070507
No Picture, Raster & Sound OK
Check RGB O/P
Pin 49,50,51,52
of IC 201 OK?
Check
RGB drive O/P
Q501, Q502 &
Q503
Check
9 volt Supply
& Q208
Replace
IC 201
Yes
No
No
Yes
Is Pin ,50,51,52
shorted to
earth?