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Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 11-28-2008, 11:00   #1 (permalink)
PSG
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K850: LCD display problem; picture atteched.


hi
i have K850 water damaged. phone working OK but there are some problems with mainboard.
i found one missed thing. i tried to make connection between that two solder points but after that step phone has got shortcirrcut and immediately power station display 0 volt of consumed power. i think it's not a fuse.

i attached picture so please advice me what part is missing there. maybe same parts are located at left connector which is near that one.
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Old 11-29-2008, 00:31   #2 (permalink)
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Quote:
Originally Posted by PSG View Post
hi
i have K850 water damaged. phone working OK but there are some problems with mainboard.
i found one missed thing. i tried to make connection between that two solder points but after that step phone has got shortcirrcut and immediately power station display 0 volt of consumed power. i think it's not a fuse.

i attached picture so please advice me what part is missing there. maybe same parts are located at left connector which is near that one.
Brother its empty point , check its pic
Rashid Ahmed Nadeem

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File Type: jpg K850.jpg (51.6 KB, 605 views)
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Old 11-29-2008, 09:55   #3 (permalink)
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not good, i thought there was a capacitor because that fielsd looks like there was something soldered.
what should i check for not displaying LCD ?
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Old 11-29-2008, 21:52   #4 (permalink)
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not good, i thought there was a capacitor because that fielsd looks like there was something soldered.
what should i check for not displaying LCD ?
Replace with good one LCD , and also read it
Rashid Ahmed Nadeem
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Old 11-30-2008, 19:40   #5 (permalink)
PSG
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i check all steps in 'display illumination problems" section of service manual. and here it's:
i don't have LCD backlights
i have 3.8V at MP 26 but when i press button to activate backlight i don't have 15V at mp 26 but i have 3,8V at MP 49 so i think i should replace V4200(manual steps)
questions:
1) i don't have new v4200 could you tell where i will find that v4200? which SE phones has got same v4200?

2) is it right thinking: v4200 operate only with backlight so i should see things on LCD but without backlight only, or when v4200 is damage i will not see anything like now?
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Old 11-30-2008, 21:23   #6 (permalink)
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v 4200 is also different , its true , its did not match with other models
Rashid Ahmed Nadeem
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