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 d500 white screen problem plz hlp

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peter
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PostSubject: d500 white screen problem plz hlp   8/9/2007, 12:56 pm

hi big brothers. i hav a fone samsung d500 na it was water damaged so shows white screen.
a mechanic tried but not done so the clien take to me.....
now i hav changed the flex, display flex connectors nd the charging jack.
but still white screen.
all keys working and also startup tone payed at startup.
means fone working all but white screen..........
what shud i do
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saw gsm helper
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 4:57 am

dear bro.
1st change flex cable
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peter
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 5:53 am

hey brothers. i traced out the ckt nd i found two big faults.
first is that U600(a3212elh) that is a MICROPOWER, ULTRA-SENSITIVE
HALL-EFFECT SWITCH
it was fully input to gnd short. now i replaced it with a same a3210elh from a diff. samsung fone.
second fault is in the pic that the prints on the board highlighed with red points r short even if the esd filter is removed. that fault is no removable by me. i tried to fix it but unable to do so. now i need ur hlp brothers, plz suggest me how to remove the faults.............
if anyone hav same hand set then plz chk these faults nd reply. ill b very thankfull to u brothers.......
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peter
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 6:16 am

CAN ANYONE give me solution for this problem trhat is shorting????????????????
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professor linux
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 7:17 am

possibly, the problem is in the flex
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peter
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 7:39 am

i hav change 2 flexes
but bro the shorting is found on the board while the fone is dissamble. it was water damage and a switch was short... that i hav shown in the above pic by me.......i hav chked the working board and ther is no shorting.........chk this. what shud i do
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peter
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 7:43 am

the transistor switch that i hav replaced is a flip ckt. can any budy find that thet the output of that flip ckt goes where.............i m attatching the pdf file with it
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peter
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PostSubject: Re: d500 white screen problem plz hlp   8/16/2007, 7:54 am

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i need to know that wher that output goen because tis switch was shoert so if i traced the output then perhaps the fault can be found. plz chk schematic and tell wher thi output goes........
here is file
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