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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 output circuit.
High voltage develops but no raster appears: Video output circuits.
High voltage does not develop: Horizontal output circuits.
WAVE FORMS
NO POWER
.
Does proper AC 90-264
Voltage appear between
the positive pole of C605?
No
Check D662, D663, D664, D665,
L601 Power Button.
Yes
Check D606, D607, D696,
IC601, O602, 0603, T601
and power circuit.
Horizontal line on raster
Yes
Does DC 14 V appear at
pin 2 of 10301?
Check the power supply circuits.
(D617 and R301)
Check the power supply circuits.
(D620 and R302)
Does DC -12V appear at
pin 4 of IC301?
Does output pulse of
| 1 |
46 Vp-p appear
at pin 5 of 1C301?
Replace C301 or check its
related circuits.
(D301, 1C301 and R310}
Yes
Check IC301 and its
related circuits.
Samsung Electronics SyncMaster 17GLi
9-1
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