K 750 Keypad Stress - GSM-Forum

mobilecell084 · 11-18-2006, 18:53

Keypads:1,2,3,call,down,right & Power Switch - Don't Work.
The Rest Of Them Work Properly.no Visable Liquid.

nassim111 · 11-19-2006, 09:51

a problem is on a key ic crystal change it
goodluk

fonegeeks · 11-19-2006, 14:00

Common fault with k series phones. Keypad I.C. needs inspection .If pad is corroded , it's curtains, if not replace or reball...

Jeffyoh88 · 11-19-2006, 19:41

try check beside that joystick 4 resitor

nassim111 · 11-20-2006, 09:36

Quote:

Originally Posted by Jeffyoh88

try check beside that joystick 4 resitor

hi
the problem the problem is not a resistance
the problem is 1000000% keypad ic tested by me in a many seri kxxx

fonegeeks · 11-20-2006, 12:26

Not sure if inunderstand your post correctly, but did you mean that you tested the keypad on another K series phone? if resistance o.k ., and keypad is o.k. , then flux and flow the I.C , but clean thoroughly with Alcohol first , dry , then flow. From personal history, the pad under the I.C is usually corroded, so you may need one of the guru's in here to post a pin out diagram ,and bypass..-good luck , it's a hard one.......

Y2ksalman · 11-20-2006, 12:31

Quote:

Originally Posted by mobilecell084

Keypads:1,2,3,call,down,right & Power Switch - Don't Work.
The Rest Of Them Work Properly.no Visable Liquid.

buddy 1st use the search button if u got not any answer then gave a new post here ur answer
/vbb/showthread...=273060&page=3

salman

mobilecell084 · 11-20-2006, 13:39

The Problem Was Deffinitly That Keypad Ic.successful Repair!
Thanks!

indefix123 · 12-08-2006, 16:58

Hello I have the same problem with my k750i as you. With which tools is it possible a reflow or rehot of the keypad ic? Can I use my 25W soldering iron on the crystal surface of the ic and reflow the solder on the connectors underneath?
Thank you for your answer.

edi_vladut · 12-09-2006, 21:59

Quote:

Originally Posted by indefix123

Hello I have the same problem with my k750i as you. With which tools is it possible a reflow or rehot of the keypad ic? Can I use my 25W soldering iron on the crystal surface of the ic and reflow the solder on the connectors underneath?
Thank you for your answer.

No man, you need hot air station....you can learn how to use it on your local GSM service lab....

11-18-2006, 18:53	#1 (permalink)
mobilecell084 Junior Member Join Date: Jun 2005 Age: 43 Posts: 7 Member: 150846 Status: Offline Thanks Meter: 0	K 750 Keypad Stress Keypads:1,2,3,call,down,right & Power Switch - Don't Work. The Rest Of Them Work Properly.no Visable Liquid.

12-08-2006, 16:58	#9 (permalink)
indefix123 Junior Member Join Date: Nov 2006 Posts: 3 Member: 395835 Status: Offline Thanks Meter: 0	k750i howto Hello I have the same problem with my k750i as you. With which tools is it possible a reflow or rehot of the keypad ic? Can I use my 25W soldering iron on the crystal surface of the ic and reflow the solder on the connectors underneath? Thank you for your answer.

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11-19-2006, 09:51	#2 (permalink)
nassim111 Freak Poster Join Date: Jan 2005 Location: algeria Age: 39 Posts: 156 Member: 102469 Status: Offline Thanks Meter: 3	a problem is on a key ic crystal change it goodluk

11-19-2006, 14:00	#3 (permalink)
fonegeeks Freak Poster Join Date: Oct 2005 Location: perth aust. Posts: 125 Member: 188959 Status: Offline Thanks Meter: 7	Common fault with k series phones. Keypad I.C. needs inspection .If pad is corroded , it's curtains, if not replace or reball...

11-19-2006, 19:41	#4 (permalink)
Jeffyoh88 Freak Poster Join Date: Jul 2006 Posts: 194 Member: 320354 Status: Offline Thanks Meter: 48	try check beside that joystick 4 resitor

11-20-2006, 12:26	#6 (permalink)
fonegeeks Freak Poster Join Date: Oct 2005 Location: perth aust. Posts: 125 Member: 188959 Status: Offline Thanks Meter: 7	Not sure if inunderstand your post correctly, but did you mean that you tested the keypad on another K series phone? if resistance o.k ., and keypad is o.k. , then flux and flow the I.C , but clean thoroughly with Alcohol first , dry , then flow. From personal history, the pad under the I.C is usually corroded, so you may need one of the guru's in here to post a pin out diagram ,and bypass..-good luck , it's a hard one.......

11-20-2006, 13:39	#8 (permalink)
mobilecell084 Junior Member Join Date: Jun 2005 Age: 43 Posts: 7 Member: 150846 Status: Offline Thanks Meter: 0	The Problem Was Deffinitly That Keypad Ic.successful Repair! Thanks!