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BD-HP16U
FLOW CHART No.3
Is AT_5V line working normally?
When the Power key (S1201) is pressed, is pin (73) of IC2503
at "L" level?
Is pin (57) of IC2503 (STANBY_CTL) at "H" level?
Is pin (74) of IC2503 (MAIN_P-CON) at "H" level?
Is pin (59) of IC2503 (DRIVE_P-CON) at "H" level?
Are DRIVE_12V and DRIVE_5V output?
Check or replace the peripheral circuits of IC2503.
The power does not come ON from power OFF status.
YES
YES
YES
YES
YES
YES
NO
Check the circuit of AT_5V.
NO
Check the line between S1201 and IC2503.
NO
Check the function of Microcomputer in IC2503 and its peripheral
circuits.
NO
Check the peripheral circuits of IC2503.
NO
Check the peripheral circuits of IC2503.
NO
Check the DRIVE_12V and DRIVE_5V circuits
(Q9014, Q9012, etc.).
4 – 9
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