Faultfinding - Philips M123A Service Manual

Colour Television
5. Faultfinding and Test Point with Waveform Diagram
Fuse Blown
Is the drain of
Q801 shorted
to earth?
Yes
Cheek /
Replace
Q801
No raster
abnormal + B
Is the + B,
resistance to earth
ok ?
No
Check the load of
B+

5.1 Faultfinding

Figure 1
No Is D815~D818
OK?
Check IC801 and
the peripheral
components.
Figure2 No Raster Abnormal +B
Check IC802 and their
peripheral components
Yes
34
Chassis: M123A
Fuse Blown
No
Replace
D815~D818
Yes
Yes
Check Q830
Q831, Q832
etc.