Showing posts with label keypad. Show all posts
Showing posts with label keypad. Show all posts
Nokia 1202 1203 1661 KeyPad Jumper Solutions
Monday, March 10, 2014
Nokia 1202 1203 1661 KeyPad Jumper Solutions
Nokia 1202 1203 1661 KeyPad Jumper Solutions
Nokia 1202 1203 1661 KeyPad Jumper Solutions
Nokia 1202 1203 1661 KeyPad Jumper Solutions
Nokia C2 01 Keypad IC Problem
Thursday, December 19, 2013
Nokia C2-01 Keypad
Nokia C2-01 Keypad Problem Solution By Changing Z2550 IC.
Nokia C2-01 Keypad IC Problem
Nokia C2-01 Keypad IC Problem
Nokia 7230 Keypad ic Jumper Solution
Monday, December 9, 2013
Nokia 1680c Keypad ic Jumpering Ways
Saturday, November 30, 2013
Nokia 1680 Keypad Not Workig Solution
Nokia Asha 201 200 Keypad Ic Jumper
Monday, November 18, 2013
Nokia Asha 201, Nokia Asha 200 Keypad Problem Repairing Solutions are available in the following article. Also you will find Nokia Asha 201, Nokia Asha 200 Keypad Ways and Jumpers information in the diagrams further in this post.
In Nokia Asha 201, Nokia Asha 200 Keypad problem can occur because of the faulty Keypad IC bad connection to the Cell Phone’s Motherboard. So first of all you should clean Nokia Asha 201, Nokia Asha 200 Keypad Ways and Motherboard of the Mobile Phone. If cleaning does not work then you can replace the Keypad IC.
Keypad Problen in China Mobiles Repairing Guide
Friday, November 15, 2013
China Mobiles Some Keys Not Working Guide
Keypad Problem in China Phones
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)
(C) 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.
(C) 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.
(C) 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.
Keypad Problem in China Phones
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)
(C) 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.
(C) 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.
(C) 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.
Asha 302 Keypad Not Working Problem Solution
Wednesday, November 13, 2013
Nokia Asha 302 Keypad Problem Solution
Asha 302 Keypad Not Working Problem Solution
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