Samsung SGH-E720 Service Manual page 6

2-1-2. Initial
Initial Failure
The voltage at the C415=1.8V?
The voltage at the C419=2.8V?
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 ?
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YES
YES
YES
YES
YES
YES
YES
END
2-3
SGH-E720 Flow Chart of Troubleshooting
Check the U401
NO
(If it has some problem,
it has to be replaced.)
Check the U401
NO
(If it has some problem,
it has to be replaced.)
NO
Check the U201
NO
Check the U201
NO
Check the U401
NO
Check the LCD part
NO
Check the Audio part