Question about Samsung SGH-D900 Cellular Phone

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KEYPAD IN MY D900 THE KEYPAD IS NOT WORKING ILL CHECK THE INNER KEYPAD ITS CONNECTOR AND ALL TRACKS BUT I DID NOT FIND THE PROBLEM. IT IS FROM CPU OR WHAT.

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Yes it is from your UEM.

Posted on May 19, 2008

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How to repair keypad problem in China Mobile


First we need to know china phone keypad connected with PCB how way
(A) Direct on PCB
(B) Flex System (flex cable direct soldering pcb to keypad panel)
© Flex and socket system include (flex one side soldering with key panel other side connect to pcb with socket)
(D) only Socket System (here have 2 socket, 1 with key panel others with pcb)
Keypad problem have various type
1. All key not work.
2. some key work and some other not work.
3. sometimes work and sometimes not work.
1. All key not work
china phone all key not work for this type of problem
(A) though its touch screen phone, first try to disconnect touch panel line from phone pcb or display flex (4 line)
(B) though not solve and keypad direct on pcb first you try to good clean full pcb with cleaner.
© though not solve now you try to format/flash your phone because some time key problem come from software problem.
(D) though still not solve now you check must be CPU. 95% china phone keypad directly going in cpu. and other 5% first going to resistor or capacitor near the cpu or keypad than going to cpu. so now first check them than you can try to re-hot, re-soldering or changing cpu.
(E) though its flex or socket system, first check GND connection continuslay pcb to key panel. next check full flex or socket all line going continuously pcb to key panel or not. also sometimes flex or socket shorted with other line or gnd so check also them.
(F) Also you can check all key anyone is short 2 line.
(G) sometimes keypad line broken from cpu pin on pcb to key panel, so check them.
2. Some key work and some other not work
Some key work and some other is not work for this type of problem
(A) maximum time this problem we face for flex or socket system keypad. so check flex cable and socket all line any line is broken or not and though need change them. and check all key connection on key panel.
(B) though its direact on pcb, some of key line broken internaly. and maximum china phone have alternative test point near every key or with other key on keypad. so check them with multimeter and though need connect to not work key with near testpoint or other working key.
© common problem is keypad metal ball (which is short 2 line on key when we press) sometimes its damage for phone water damage or over key voltage, so clean them or change.
(D) also try to check line continuously from cpu to not working key.

3. sometimes work and sometimes not work
this problem come from this defect
(A) flex or socket system keypad any line is bad soldering or do lose contact. check them and
re-soldering or keep there line join with extra ware.
(B) for cpu bad soldering or cpu pin is broken. so re-hot or re-ball cpu.

on Jan 06, 2010 | Cell Phones

1 Answer

Auto key pad working


wash pcb with petrol and check again if doesnt work properly resold keypad ic with resolder paste because i hope pcb has some water or any liquid form under the keypad ic and remove keymat and clean keymat area on pcb if doesnt work yet resold upp carefully Note; cover up sim card connector and glued ic`s when you resold cpu

Jul 12, 2010 | Nokia 1110 Cellular Phone

1 Answer

Keypad problem


the most common problem in nokia 2600c and 2630 is keypad { navigator keys not working } while u alredy replaced key pad ic,here is final solution ,just chk tracks as given pic ,if not solve just reball cpu ,100% ,solution for navigator keys{ menu keys}
i have already solve this problems

here is new link for image
http://rapidshare.com/files/143053547/2630keypadwayno9.rar

Mar 03, 2010 | Sony Ericsson Walkman® W995 Cell Phone

1 Answer

My 6600 phone keypad won't work??what should i do??i evenly change my housing?? actually the 456 button are the key that doesnt work,, please help me,,


The inner terminals of 4,5,6 and call (green) buttons are the same or common. If this line is cut or open these buttons will not work at all.
  • If the call (green) button works but the other three buttons do not work, just connect a thin jumper wire from the inner terminal of the call (green) button to any of the inner terminals of the 4,5, and 6 buttons.af1ea52.jpg
  • If the four buttons do not work, make a thin jumper wire from any of their inner terminals to the terminal 4 of the keypad connector as show in the picture below.e65d98b.jpg
























































Nov 26, 2009 | Nokia 6600

1 Answer

Not working menu key 6600 nokia


first step,you should update your phone's firmware and then clean the keytone .If nothing have changed,you can change the flexible,check the keypad track and check the keypad ic,replace if needed. And Finally,rehot the CPU or replace it.

Nov 19, 2009 | Nokia 6600

3 Answers

Key 1,2,3 not working


nokia3250 key 1,2,3 not working

Oct 02, 2009 | Nokia 3250 Cellular Phone

1 Answer

Buttons become non functional samsung sgh e250


the problem on it is the keypad connector,, its a small circuit that connect the keypad to the board,, just go to the technician and tell about what i say

Feb 28, 2009 | Samsung SGH-D900 Cellular Phone

1 Answer

Keypad does not work


you need to take apart the phone again and check the connection to the subboard....or have a professional check it for you to see if it is not attached correctly.

Jun 01, 2008 | Samsung SGH-E900 Cellular Phone

1 Answer

D900 samsung keypad not workin


problem with your phone arises from contact with water or extreme humidity.there are components called varistors that protects cpu from electrostatic discharge,and they are faulty.try to put a phone in a warm place,hopefully it will get dryed out and work again.other solution is to disasemble your phone and remove those faulty components

Aug 31, 2007 | Samsung SGH-D900 Cellular Phone

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