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Flow Chart of Troubleshooting
SAMSUNG Proprietary-Contents may change without notice
7-6
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7-1-3 Abnormal Backlight Operation
Press any button on the phone
"H"level
@ U200 pin5 ?
Check U100
3.3Volt
@U200 pin4 ?
Check Battery and its neighboring circuits.
Replace if required.
Is the output of
U200 pin7 >=180 volt ?
Check U200, ZD201, EL sheet.
Replac if required.
No
No
No
Yes
Yes
Yes
Yes
END
Press any button on the phone
"H"level
@ U200 pin5 ?
Check U100
3.3Volt
@U200 pin4 ?
Check Battery and its neighboring circuits.
Replace if required.
Is the output of
U200 pin7 >=180 volt ?
Check U200, ZD201, EL sheet.
Replac if required.
No
No
No
Yes
Yes
Yes
Yes
END