ViewSonic VA720 Service Manual - Page 11

Power Ckt, Input Ckt

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POWER CKT POWER CKT START YES CHECK +5V,+2.5VDD, +3.3V_DVDD PNL_VCC NO CHECK POWER CKT (12V,+5V &+ 3.3V&+2.5V CKT) YES YES END REPLACE U6 INPUT CKT INPUT CKT START YES OK Check U2 O/P Data NO YES TO gm2121 CKT YES CHECK I/P R,G & B Video, HSYNC(pin 101),VSYNC(pin 100) U5 to U2 Signal NO CHECK Flash memory U5 CKT,D_SUB connector And U6(74LVC14) ViewSonic Corporation Confidential - Do Not Copy VA720-2 8

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YES
YES
NO
YES
START
CHECK
+5V,+2.5VDD,
+3.3V_DVDD
PNL_VCC
END
CHECK POWER CKT
(12V,+5V &+
3.3V&+2.5V CKT)
POWER CKT
POWER CKT
YES
YES
NO
NO
OK
YES
Check U2 O/P Data
TO gm2121
CKT
INPUT CKT
CHECK I/P R,G & B Video,
HSYNC(pin 101),VSYNC(pin 100)
U5 to U2
Signal
START
CHECK Flash memory U5
CKT,D_SUB connector
And
U6(74LVC14)
INPUT CKT
REPLACE U6
8
ViewSonic Corporation
Co
nfidential
- Do Not Copy
V
A
7
2
0-
2