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10-1-4. LCD Display part
LCD display is abnormal
Check LCD connection
and replace LCD
LCD Backlight is on?
YES
C501, C500 is 2.9V?
YES
pin#6 of ZD501
is LOW?
YES
Are there anysignal
at pin#5 of ZD501?
YES
IS there any
problem at F501,
F502, F504, F505
NO
Check U302
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NO
pin#2 of CN1
is high?
NO
pin#5 of U704
is high?
NO
C517 > 3.5V?
YES
pin#2 of U704
is high?
YES
CHeck U704
NO
Check U102
NO
Check F507 & U302
NO
YES
Replace or resolve
F501, F502, F504, F505
10-9
Flow Chart of Troubleshooting
Check LCD
YES
Check CN1
YES
Check C517
NO
Recharge Bat
NO
Check U201
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