ViewSonic VA720 Service Manual - Page 12
Flash Memory, Gm2121 Ckt
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UPC - 766907573237
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FLASH MEMORY CKT FLASH MEMORY CKT START YES CHECK U5 (pin2~12 C ,23,25~29) ADDRESS ; (pin13~15,17~21) DATA YES SIGNAL END NO YES CHECK U3 RESET(pin 2),X1 (14.318MHZ ) SIGNAL NO CHECK U5 OK OR REPLACE GM2121 CKT GM2121 CKT START YES CHECK U2 RXE3+ , RXE3- , RXE2+ , RXE2- , RXE1+ , RXE1- , RXEC+ , RXECAnd RXO3+ , RXO3- , RXO2+ , RXO2- , RXO1+ , RXO1- , RXO0+ , RXO0- , RXOC+ , RXOC- NO YES END OK CHECK U6 INPUT CHECK U4 I2C SIGNAL YES REPLACE U4 NO CHECK FLASH MEMORY INPUT & H&V BUFFER CKT ViewSonic Corporation Confidential - Do Not Copy VA720-2 9
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YES
NO
NO
YES
YES
OK
FLASH MEMORY
CKT START
FLASH MEMORY
CKT
CHECK U3 RESET(pin 2),X1
(14.318MHZ
)
SIGNAL
C
C
HECK U5 (pin2~12
,23,25~29) ADDRESS ;
(pin13~15,17~21) DATA
SIGNAL
END
CHECK U5
OR REPLACE
YES
YES
YES
NO
NO
OK
GM2121 CKT
START
END
REPLACE U4
CHECK U2 RXE3+ , RXE3- , RXE2+ ,
RXE2- , RXE1+ , RXE1- , RXEC+ , RXEC-
CHECK U4 I2C SIGNAL
CHECK U6
INPUT
CHECK FLASH MEMORY
INPUT & H&V BUFFER
CKT
And RXO3+ , RXO3- , RXO2+ , RXO2- ,
RXO1+ , RXO1- , RXO0+ , RXO0- , RXOC+
, RXOC-
GM2121 CKT
9
ViewSonic Corporation
Co
nfidential
- Do Not Copy
V
A
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