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9 Troubleshooting
Notes:
1. If picture does not appear, fully rotate the brightness and contrast controls
clockwise before inspection.
. Check the following circuits:
©No raster appears: Power circuit, horizontal output circuit, H/V control circuit and H/V out-put circuit.
High voltage develops but no raster appears: Video output circuits.
eHigh voltage does not develop: Horizontal output circuits.
WAVE FORMS
NO POWER
Does proper AC 90-264
Voltage appear between
the positive pole of C606?
No
f Check D601~D804,F601,LF601
Power Button.
Yes
Check D607,D601,1C601-IC603,
Q601-0604,R608,T601
and power circuit.
Horizontal line on raster
Check the power supply circuits
(D621, 1C604 and R303)
Does DC 12V appear at
pin 2 of 10301?
Check the power supply circuits
(D615 and R304)
Does DC -12V appear at
pin 4 of 1C301?
Does output pulse of
i
47 Vp-p appear
at pin 5 of 10301?
Replace IC301 or check its
related circuits.
(D301, 1C301 and R310)
Yes
Check IC301 and its
related circuits.
Samsung Electronics SyncMaster 15GLi
9-1
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