Service manual

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FIG 19. AUDIO SINE SIGNAL IN FIG 20. AUDIO SINE SIGNAL OUT
A2. No Display on Screen (Screen is black, LED is off)
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Check that CM16 positive is at 5V. ( FIG 2.)
Check that the voltage level of JM1 is
approximately 12V
Check JM2 pin1
is12V, pin5 is 5V
ICM1 failure LM1,2 failure
Adapter failure
YES NO
YES NO
YES NO
Inverter failure ICM10 failure
YES NO
ViewSonic Corporation
Confidential – Do Not Copy
VG800b
45
Check that the voltage level of ICM1 pin8 is
approximately 12V. ( FIG 1.)