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Service Manual
ViewSonic
VG181
July 2000 - Version 1.0
TROUBLE SHOOTING
No IMAGE DISPLAYED
1. Is adaptor's output +12V ?
2. Ie JP4 connected good ?
3. 1s DC-AC ok ?
4. ts UTS working ok ?
LED is fighting ?
It is in power saving
1. Check video cable
2. is the timing supported ?
3, Check GHS and GYS!
4. Check 41 if digital
5. Check U9 if analog (SOG)
6. Check DDC if digital
LED is green ?
1, Check J5 (VDD & VEE)
2. {8 inverter ok ?
ts backtight on ?
it means date to LYDS
1. Is J6 connected good ?
2. Check J6 {LVOG)
3. Check U32, Uaa
4. Is panel ok 7
U15 no data out ?
it means data from U1 or U9
1. Is U15 working good 2?
2. Is U13 working good 7
3. Is Ut4 data correct 7
U15 no data in 7
1. Check U4 if digital
2. Check power of U1 if digital
3. Check Pt if digital
4, Chock U0 if digitat
5. Check power of U9 if digital
6. Check P2 it anatog
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