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6. Trouble Shooting Flow Chart (VE510s-4/VE510b-4)
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~R816 broken or
not
No
With power
but power saving mode more
than 1 Watts
Check Q903,
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 D814,Q802,Q804 failed
or not
If there had Sawtooth
waveform on DC output
Check I802,I803
If there had Sawtooth
waveform on DC output
Check D809,D810,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 Q905.
Check I901,I902,
R904,R905
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
41
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VE510s-4_VE510b-4
Summary of Contents for VE510b-4
Page 70: ...11 2 MAIN PCB BOTTOM VIEW 67 ViewSonic Corporation Confidential Do Not Copy VE510s 4_VE510b 4...
Page 71: ...11 3 CON PCB TOP VIEW 69 ViewSonic Corporation Confidential Do Not Copy VE510s 4_VE510b 4...
Page 72: ...11 4 CON PCB BOTTOM VIEW 69 ViewSonic Corporation Confidential Do Not Copy VE510s 4_VE510b 4...
Page 74: ...11 6 POWER PCB BOTTOM VIEW 71 ViewSonic Corporation Confidential Do Not Copy VE510s 4_VE510b 4...