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SGH-E720 Flow Chart of Troubleshooting
2-
3
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2-1-2. Initial
The voltage at the C415=1.8V?
The voltage at the C419=2.8V?
Initial Failure
The voltage at the ZD405
" Low --> High" ?
There is 32.768KHz wave
form at the C216, C217 ?
The voltage on R412 is
"Low --> High" ?
The voltage is 2.8V
at the C416,C418,C419 ?
LCD Display OK ?
Sound operation OK ?
END
Check the U201
Check the U201
Check the U401
Check the LCD part
Check the Audio part
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
YES
Check the U401
(If it has some problem,
it has to be replaced.)
Check the U401
(If it has some problem,
it has to be replaced.)
