Toshiba SD-2815 - Electrical Troubleshooting Guide; Power(Smps) Circuit

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ELECTRICAL TROUBLESHOOTING GUIDE
No 5V_D
or 5V_A .
No 5.2VA.
Is 5.2VA section working?
(Is the POWER CTL at
Pin6 High/low?)
Is oscillation present at the
Base of Q108?
Replace Q108.
Check D109, C123, R125,
R124.
Replace R102.
Replace BD101.
(Bridge rectifier)
Is R102(R104) normal?
Is about AC 100V applied to
IC101 Pin 3.
Check IC101.
Is 5.2V applied to IC102
Pin 1?
Is there a DC voltage at the
(+) terminal of BD101?
Check R127, 128.
(SHUTDOWN CKT)
1. Power(SMPS) Circuit
No FLD
Is 5.2VA section working?
Replace SMPS trans(T101).
Replace the inferior
components.
Are D109, L103 open?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
A. B.
NO
NO