![background image](http://html.mh-extra.com/html/samsung/sgh-s400i/sgh-s400i_service-manual_1191045008.webp)
SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-
5
This Document can not be used without Samsung's authorization
2-1-2. Initial
Initial Failure
pin#C12 of UCD307 = 1.8V
Check the UCD307
(if it has some problem, it is to be replaced.)
Yes
No
Is the pin #K9 of UCD307
"Low
→
High" ?
Yes
No
Check the UCD307
(if it has some problem, it is to be replaced.)
There is 32.768kHz wave
forms at the C220 and
C221
Yes
No
Check the UCP201
The voltage is "High" at
the C328,C329,C332
Check the UCD307
LCD display is O.K
No
Yes
Yes
Yes
Check the LCD part
No
Sound is O.K
Yes
No
Check the Audio part
END
Yes
pin#10 of U311 = 1.8V
Check the U311
(if it has some problem, it is to be replaced.)
No
pin#10 of U312 = 1.6V
Check the U312
(if it has some problem, it is to be replaced.)
No
pin#J12 of UCD307 = 2.9V
Check the UCD307
(if it has some problem, it is to be replaced.)
No
Yes
Yes