6600 keypad problem - Page 2 - GSM-Forum

romydgr8 · 01-19-2005, 08:04

try to flash it. i ve done many nok phones this way.
good luck.

Keke · 01-19-2005, 08:18

Only solutio is to replace this part and unless you have some very special equipment, you cannot reball this chip because of the size, (Very small).

replace new one and solution solve 100%

BR

riprex · 01-21-2005, 16:16

To everyone who's wondering where the 2 chips are:

Open the phone. You will see the keypad is connected to the phone board through a connector. On the left side of the connector you will see 2 small square BGA chips. If some of your keys are not working and you have already tried the keypad itself and you don't find a problem there, then try these chips. If one of the chips is chipped or broken you don't have to look for the problem anywhere else.
First try to reflow the chips. If that doesn't work then take the chips from another phone, reball them, using a mask and solder them on the phone to be repaired.
The 2 chips are controlling different keys, so if you are lucky you will do it only by replacing one chip. Test the phone after each replacement and take notes of which keys are working. If after replacement the condition of the phone is worse then you haven't soldered the chip properly.

Good Luck!

baraka42 · 01-23-2005, 07:41

the chips is EMI Filter more about it is here.

http://news.thomasnet.com/fullstory/457467

w.b.r.

TONYTONY · 01-25-2005, 12:27

Thanks for the info barak. As we can see in the pdf it is used for protection and as a filter only.

So if we find input and outputs of chip, then we can put short and see what happens.

Anyone can help me find these please?

tonytony

TONYTONY · 01-25-2005, 12:58

Visit this link for a detailed account of this ic.

http://www.st.com/stonline/press/mag...i99/pnews1.htm

But we still need pinouts to perform any repair..

thanks

tonytony

kailash_gm · 01-25-2005, 20:49

Quote:

Originally Posted by Keke

The phone dropped and the sreen will only show ligth , but the bit problem that keys 1,4,7 and menu will not work after force normal mode and will some time boot with no problem

rehot upp but no help .

I need assistance please.

[email protected]

if problem is not solved then u must replace the new glass ic at the bottom of the pcb which is white colour

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01-19-2005, 08:04	#16 (permalink)
romydgr8 Freak Poster Join Date: Dec 2004 Location: Calcutta (India) Age: 44 Posts: 116 Member: 96867 Status: Offline Thanks Meter: 1	try to flash it. i ve done many nok phones this way. good luck.

01-19-2005, 08:18	#17 (permalink)
Keke No Life Poster Join Date: Jun 2002 Location: CT SA Age: 52 Posts: 1,387 Member: 12733 Status: Offline Thanks Meter: 26	Only solutio is to replace this part and unless you have some very special equipment, you cannot reball this chip because of the size, (Very small). replace new one and solution solve 100% BR

01-21-2005, 16:16	#18 (permalink)
riprex Junior Member Join Date: Dec 2004 Posts: 13 Member: 95872 Status: Offline Thanks Meter: 0	To everyone who's wondering where the 2 chips are: Open the phone. You will see the keypad is connected to the phone board through a connector. On the left side of the connector you will see 2 small square BGA chips. If some of your keys are not working and you have already tried the keypad itself and you don't find a problem there, then try these chips. If one of the chips is chipped or broken you don't have to look for the problem anywhere else. First try to reflow the chips. If that doesn't work then take the chips from another phone, reball them, using a mask and solder them on the phone to be repaired. The 2 chips are controlling different keys, so if you are lucky you will do it only by replacing one chip. Test the phone after each replacement and take notes of which keys are working. If after replacement the condition of the phone is worse then you haven't soldered the chip properly. Good Luck!

01-23-2005, 07:41	#19 (permalink)
baraka42 No Life Poster Join Date: Aug 2002 Location: india Age: 63 Posts: 1,476 Member: 14578 Status: Offline Thanks Meter: 831	the chips is EMI Filter more about it is here. http://news.thomasnet.com/fullstory/457467 w.b.r.

01-25-2005, 12:27	#20 (permalink)
TONYTONY No Life Poster Join Date: Jul 2003 Location: BahaMAS Age: 40 Posts: 557 Member: 35975 Status: Offline Thanks Meter: 19	Thanks for the info barak. As we can see in the pdf it is used for protection and as a filter only. So if we find input and outputs of chip, then we can put short and see what happens. Anyone can help me find these please? tonytony

01-25-2005, 12:58	#21 (permalink)
TONYTONY No Life Poster Join Date: Jul 2003 Location: BahaMAS Age: 40 Posts: 557 Member: 35975 Status: Offline Thanks Meter: 19	Visit this link for a detailed account of this ic. http://www.st.com/stonline/press/mag...i99/pnews1.htm But we still need pinouts to perform any repair.. thanks tonytony