Troubleshooting - Zenith DVD5201 Service Manual

TROUBLESHOOTING

1. Power(SMPS) Circuit
A.
No Display
Is 5.2VA section working?
YES
Are D109, L103 open?
YES
Replace SMPS trans(T101).
Replace the inferior
components.
VR166 - 923-03461
ELECTRICAL
NO
NO
No 5.2VA.
Check R127, 128.
(SHUTDOWN
Is 5.2V applied to IC102
Pin 1?
NO
Is there a DC voltage at the
(+) terminal of BD101?
YES
Is R102(R104) normal?
YES
Is about AC 100V app;ied to
IC101 Pin 3.
NO
Check IC101.
18
B.
Is 5.2VA section working?
NO
(Is the POWER CT L at
Pin6 High/low?)
NO
Is oscillation present at the
Base of Q108?
CKT)
YES
Check D109, C123, R125,
R124.
NO
NO
No 5V_D
or 5V_ A .
YES
YES
Replace Q108.
Replace BD101.
(Bridge rectifier)
Replace R102.
DVD2 - SERVICING