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.
Summary of Contents for LCD2080UX - MultiSync - 20.1" LCD Monitor
Page 4: ...1 1 User s Manual 1 A Version MultiSync LCD2080UX TM ...
Page 30: ...1 27 2 B Version MultiSync LCD2080UX User s Manual ...
Page 439: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 1 14 10 1 ...
Page 440: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 2 14 10 2 ...
Page 441: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 3 14 10 3 ...
Page 442: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 4 14 10 4 ...
Page 443: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 5 14 10 5 ...
Page 444: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 6 14 10 6 ...
Page 445: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 7 14 10 7 ...
Page 446: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 8 14 10 8 ...
Page 447: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 9 14 10 9 ...
Page 448: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 10 14 10 10 ...
Page 449: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 11 14 10 11 ...
Page 450: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 12 14 10 12 ...
Page 451: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 13 14 10 13 ...
Page 452: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 14 14 10 14 ...
Page 453: ...SCHEMATIC DIAGRAM LCD2080UX POWER PWB 1 1 10 15 ...