(VA521/VE510s-2/VE510b-2)
6.1.
NO POWER or BACKLIGHT
NO POWER
3.3V on P801
pin5,6 to GND
12V on P802
pin3 to GND
NO BACKLIGHT.
Check P802 pin2 with
3.3V or not
CHECK C805
with voltage more than
150volts or not
Check R813~R815 broken or
not
No
With power
but power saving mode more
than 1 Watts
Check Q903,I804
without connecting main board,
with main board more than
1Watts
check main board.
Yes
CHECK
D801~D804 failed or not,
F801 broken or not,
R802 failed or not
Check main board
backlight_on signal
Check Q801 D & S short or
not,I801 failed,
R807 broken or not
Check Q802,D813 failed or not
If there had Sawtooth
waveform on DC output
Check I802,I803
If there had Sawtooth
waveform on DC output
Check D809,D811.
If there had Sawtooth
waveform on DC outputr
Check 5V on I901 pin6
Check I901 pin1 voltage
>1.0volts,<3.0volts
while inverter turn on
Check
Q901,Q902,D903,D904
Check Q903,D906
Check R925,F901
broken or not
Check Q905.
Check I901,I902,
R904,R905
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
17
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
VA
521
VE510b/s-2
6. Trouble Shooting Flow Chart
Summary of Contents for ve510b/s-21
Page 55: ...11 2 MAIN PCB BOTTOM VIEW 52 ViewSonic Corporation Confidential Do Not Copy VA521 VE510b s 2 ...
Page 57: ...11 5 POWER PCB TOP VIEW 54 ViewSonic Corporation Confidential Do Not Copy VA521 VE510b s 2 ...
Page 58: ...11 6 POWER PCB BOTTOM VIEW 55 ViewSonic Corporation Confidential Do Not Copy VA521 VE510b s 2 ...