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7-2. LCD Working
Insert Power
NG
LCD Display
OK?
YES
Back Light
OK?
YES
TSP
OK?
2pin in
NO
U200(Sub)
= High?
YES
1pin in
U200(Sub)
= High?
YES
4,5pin in U805
NO
= High?
YES
1pin in U805
= 12V?
When touch screen
NO
46pin in UCD501
YES
Check 1,3,4,6 pin in ZD717 &
neighboring circuits
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NO
NO
NO
NO
YES
= High?
7-9
Flow Chart of Troubleshooting
Check LCD Sub B'd &
Slide FPCB
6pin in
U200(Sub)
= High?
YES
Change U200(Sub)
Check
LCD Sub B'd & LCD
Check LCD Sub B'd &
Slide FPCB
Check U805 &
neighboring circuits
Check
LCD Sub B'd & LCD
Check
NO
LCD Sub B'd,
Slide FPCB & LCD
NO
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