ViewSonic VA720 Service Manual - Page 13
Osd Ckt, Panel Power Ckt
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UPC - 766907573237
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OSD CKT OSD CKT START OK YES OK CHECK OSD SWITCH S1~S8 CKT NO REPLACE YES CHECK OSD OSD SWITCH CABLE YES CHECK U2 PIN 8,9,13,16,33 NO REPLACE U2 YES END MENU/KEY GPIO17(pin 13) UP/KEY GPIO16(pin 9) SELECT/KEY GPIO22(pin 8) DOWN/KEY GPIO21(pin 16) POWER/KEY GPIO9 (pin 33) PANEL POWER CKT PANEL POWER CKT START YES YES CHECK PNL_VCC,FB2 END NO CHECK POWER CKT YES +5V ViewSonic Corporation Confidential - Do Not Copy VA720-2 10
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YES
YES
OK
YES
NO
YES
NO
OK
OSD CKT
END
CHECK OSD
CABLE
CHECK U2 PIN
8,9,13,16,33
START
OSD CKT
CHECK OSD SWITCH
S1~S8 CKT
REPLACE U2
REPLACE
OSD SWITCH
YES
YES
NO
YES
START
CHECK PNL_VCC,FB2
END
CHECK POWER CKT
+5V
PANEL POWER CKT
PANEL POWER CKT
MENU/KEY
GPIO17(pin 13)
UP/KEY
GPIO16(pin 9)
SELECT/KEY
GPIO22(pin 8)
DOWN/KEY
GPIO21(pin 16)
POWER/KEY GPIO9
(pin 33)
10
ViewSonic Corporation
Co
nfidential
- Do Not Copy
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