ViewSonic VE710b-4 Service Manual page 45

6.2. NO DISPLAY
Check Power
Refer to NO POWER
trouble shoot flow char
ViewSonic Corporation
No
Display
Dark
Check LED Color
region
Green
Press Power key
ON/OFF is OK ?
(See LED is green or
dark.)
Press "1" key if OSD
menu is on display ?
Check X102 Crystal
14.318MHz(CPT Panel)
24.576MHz(CMO Panel)
is working ?
Check I101
Pin#73,74 data bus
have signal
Check panel Powers
VLCD_3V3(CPT Panel)
VLCD_5V(CMO Panel)
correct
Change LCD panel
Amber
Check IO cable is
connect OK ?
Amber & Green
Check X101 Crystal
12MHz is working?
Yes
No
Check uP I104
Reset is Ok ?
Yes
No
Check Keypad
pcb is OK ?
Yes
Check if
Inverter is Ok ?
Yes
No
Change X102
Yes
No
Change I101 LCD
controller IC
Yes
Yes
42
Confidential - Do Not Copy
Yes
Check I/P signal is in
pwr saving state?
No
Check I104 is OK ?
Yes
Change
I106
No
Check Reset circuit
C117,Q101
Check
No
Inverter
Circuit
VE710s-4_VE710b-4