Toshiba 15VL56B Service Manual page 36

No Raster on PC Signal
Repeat Process A
Pass
Ref.3/3-1
Check the Input/
Output of IC701
Pass
Ref.4/4-1
Check the Input / Output
IC500(gm2221) of Main
Pass
Check input source cable
and Jack
Check R715
Level(LOW 0V)
Fail
Pass
Re-soldering or
Change IC701
Fail
H Sync Input :
Ref.3
IC701 (Swiching IC), #23
H Sync Input :
Ref.4
IC500 (Scaler IC), #181
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Check short circuits of
Main B/D
Fail
Re-soldering or
Change IC500
V Sync Input :
Ref.3-1
IC701 (Swiching IC), #13
V Sync Input :
Ref.4-1
IC500 (Scaler IC), #182