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Samsung Hardware Repair Post here your Hardware Repairing Hints or Problems with Samsung Phones. |
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08-23-2005, 19:15 | #1 (permalink) |
No Life Poster Join Date: Mar 2001 Location: Croatia Age: 46
Posts: 723
Member: 3508 Status: Offline Thanks Meter: 71 | SGH-D500 - keys 2,5,8,0,6 don't work!! Does anyone know what can be the problem!? Keys 2,5,8,0 and 6 don't work, all other keys work perfectly! Sometimes they work perfectly and then again don't work...it drives me crazy!! Phone wasn't water damaged but I cleaned PCB, removed C766-775 which are linked to the kepay, removed microphone, and again the same!! Can flat cable be the problem!? Or any other idea!? BR |
08-23-2005, 19:20 | #2 (permalink) |
No Life Poster Join Date: Mar 2004 Location: Midlands, UK
Posts: 782
Member: 57937 Status: Offline Thanks Meter: 34 | Its usually the flat cable, but from my experience its been the upper slide keys that don't work, when the flat cable is at fault but I guess while doing you other repairs you have disconnected it and reconnected it, if it is the flat cable, usually disconnecting and reconnecting sorts the problem out |
08-23-2005, 20:05 | #4 (permalink) | |
No Life Poster Join Date: Mar 2001 Location: Croatia Age: 46
Posts: 723
Member: 3508 Status: Offline Thanks Meter: 71 | Quote:
Maybe will try to power on the phone without keyboard and membranes and try keys with screwdriver to see what will hapend! BR | |
08-23-2005, 20:32 | #5 (permalink) | |
No Life Poster Join Date: Aug 2004 Age: 47
Posts: 966
Member: 76257 Status: Offline Thanks Meter: 77 | Quote:
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08-23-2005, 20:43 | #6 (permalink) |
Freak Poster Join Date: Jul 2004
Posts: 461
Member: 71751 Status: Offline Thanks Meter: 3 | check the board for current reading on each of those keys it could be due to current failing to reach those keys,then ofcourse you'll have to trace the resistors necessary for that. |
08-31-2005, 06:08 | #8 (permalink) | |
No Life Poster Join Date: Mar 2001 Location: Croatia Age: 46
Posts: 723
Member: 3508 Status: Offline Thanks Meter: 71 | Quote:
Is there any IC for keyboard or it goes directly to CPU!?!? BR | |
09-02-2005, 03:43 | #10 (permalink) | |
No Life Poster Join Date: Mar 2001 Location: Croatia Age: 46
Posts: 723
Member: 3508 Status: Offline Thanks Meter: 71 | Quote:
BR | |
09-02-2005, 13:24 | #11 (permalink) |
Insane Poster Join Date: Feb 2003 Location: Belgrade,Serbia Age: 55
Posts: 64
Member: 23157 Status: Offline Thanks Meter: 0 | You must to mesure with your instrument. Keypad is broken because CPU is confused with the strange information,he think that is more keypad is pushed on. |
09-02-2005, 16:07 | #12 (permalink) | |
No Life Poster Join Date: Mar 2001 Location: Croatia Age: 46
Posts: 723
Member: 3508 Status: Offline Thanks Meter: 71 | Quote:
You didn't read all my posts!! Phone is open, without membranes and make contact with screwdriver, and when I press harder PCB keys work, if I realese it a little bit they stop working!! BR | |
09-02-2005, 17:28 | #13 (permalink) |
No Life Poster Join Date: Jun 2001 Location: Uranus Age: 53
Posts: 731
Member: 5072 Status: Offline Thanks Meter: 91 | By the info that you have given it seems that you have 1-2 tracks broken. Probably because the phone fell down or something like that .Please check all the main keypad tracks ....that should solve the problem. Rgds |
09-04-2005, 00:02 | #14 (permalink) | |
Freak Poster Join Date: Jul 2003 Location: UK Age: 56
Posts: 168
Member: 33320 Status: Offline Thanks Meter: 6 | Quote:
B.R. Dusko | |
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