6-11
5. Switching Regulator Circuit Failure
Check the output voltages.
Check other circuits
1. Turn off the power switch (SW901).
2. Disconnect the AC Power cable and CN951. And wait 1 minute.
3. Short CN951 pin 12 (PMS) and pin 13 (5VA) on the SW.REG PWB.
4. Soldering the dummy resistor (3W, 330
Ω
) between CN951 pin 7 (GND) and pin 1 (18VC).
5. Connect the AC Power cable. And turn on the power switch (SW901).
6. Check the output voltages again.
CONTINUE
Make sure that the voltage of between CN951 pin 12 (PMS)
and pin 14 (GND) approx. 0V.
Check the MAIN PWB circuits
Check other circuits
+5VA output is 0V.
And other outputs are 0V.
1.Make sure that the voltage of between CN951 pin 1
(18VC ) and pin 7 (GND) approx. +18V.
2.Make sure that the voltage of between CN651 pin 13
(5VC ) and pin 14 (GND) approx. +5V.
Passed
Failed
NO
YES
Passed
Failed
NO
YES
Check the following parts
C9A2, C9A3, C9A4, C9A7, C9E1, C9E2, C9E3,
D9A1, D9A2, D9E1, IC901, IC9A1, IC9E1, L9A1,
L9E1, L9X2, PC9A1, Q901, R915, R9A3, R9A6,
R9E1, R9E2, R9E3, R9E4, T9A1, ZD910, ZD9A4,
F901.
If Fuse F601 is broken. Check the following parts.
C901, C902, C906, C9X1, R909, R917, D901,
T901, IC901, IC9A1, Q901, Q913, ZD918, ZD919,
VD901.
Содержание LCD2080UX - MultiSync - 20.1" LCD Monitor
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