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6. Trouble Shooting Flow Chart
Green + Orange
Check DC power
12V,5V,3.3V,2.5V
,MCU 3.3V
Check MCU
crystal
Check MCU or
Reprogram MCU
Check input source
Check 7414
B
ViewSonic Corporation
Use Analog Native mode
(Window Pattern )
Off
Green
Power LED
Orange
Check H/V sync
at 7414 output
Abnormal
OK
Check Scaler
(1)Scaler no power
(2)Scaler changed no OSC
START
Yes
Picture
visible?
No
On
Backlight
on?
key pad work?
(1)Panel no power
(2)Panel cable not connected
(3)H/V sync process to panel
(1)Check Scaler H/V sync correct?
(2)Measure at Scaler side
Check Inverter
Confidential - Do Not Copy
9
A
Green LED &
No
Yes
VG510b/s
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