ViewSonic VG800-2 Service Manual page 48

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