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7 Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. 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.
7-1 No Power
Does proper DC 110-366 Volts
appear between the positive and
negative poles of C606?
Yes
Does the appear 2'nd voltage
of T601 (45V, 72V, 14.7V and so on)?
(The condition BD602, BD603,
JW71, JW63 are desoldered)
Yes
Does the appear 45V at D617's
Cathode pin? (the condition L501's
are pin is desoldered)
No
Does the appear 45V at D617's
Cathode pin? (the condition L403's
are pin is desoldered)
No
Does the appear 45V at D617's
Cathode pin? (the condition
JW71, JW63 are desoldered)
No
Does the appear 45V at D617's
Cathode pin? (the condition
CN102 is disconnected)
CKG7507L
No
Check the Fuse, Bridge Diodes (D601~D604),
IC601, C617 and D614.
Check D605, C616, C618, components in primary
No
part, the power feedback circuit (IC602, IC603,
and its related circuits), D617, D618, D610, D615,
D612, D620, D619, IC606 and IC607.
Check the Q503, Q504 and those are related High
Yes
Voltage control circuits. (IC501, Q510, Q501,
Q502, Q506, D508, D517 and D524)
Check the Q406, Q403, Q411 and those are
Yes
related Horizontal control circuit. (IC401, IC402,
Q404, Q401, Q402, Q405, Q408 and Q409)
Yes
Replace the IC301.
No
Check the IC102, IC101 and another components
in Video Part (IC103, IC104, etc).
7-1
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