29
BDP-120
5
6
7
8
5
6
7
8
A
B
C
D
E
F
The power does not come ON from power OFF status.
Is AT_5
V
line working normally?
Check the circuit of AT_5
V
.
Check the function of Microcomputer in IC2503 and its peripheral
circuits.
When the Power key (S1201) is pressed, is pin (73) of IC2503
at "L" level?
YES
N
O
N
O
N
O
Is pin (57) of IC2503 (STA
N
BY_CTL) at "H" level?
Is pin (74) of IC2503 (MAI
N
_P-CO
N
) at "H" level?
Check the line between S1201 and IC2503.
N
O
Check the peripheral circuits of IC2503.
YES
YES
Is pin (59) of IC2503 (DRI
V
E_P-CO
N
) at "H" level?
N
O
Check the peripheral circuits of IC2503.
YES
Are DRI
V
E_12
V
and DRI
V
E_5
V
output?
N
O
Check the DRI
V
E_12
V
and DRI
V
E_5
V
circuits
(Q9014, Q9012, etc.).
YES
Check or replace the peripheral circuits of IC2503.
YES
FLOW CHART No.3
www. xiaoyu163. com
QQ 376315150
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TEL 13942296513
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
