Showing posts with label mobiles. Show all posts
Showing posts with label mobiles. Show all posts
China Mobiles MTK 6302n 20 Pin Sim IC Jumper Solutions
Sunday, March 2, 2014
China Mobiles MTK 6302n 20 Pin Sim IC Jumper Solutions
China Mobiles MTK 6302n 20 Pin Sim IC Jumper Solutions
All China Mobiles MTK PA Jumper Repair Solutions
Sunday, February 9, 2014
All China Mobiles MTK PA Jumper Repair Solutions
All China Mobiles MTK PA Jumper Repair Solutions
All China Mobiles MTK PA Jumper Repair Solutions
CELKON China Mobiles All Models Schmetic Diagrams
Friday, November 29, 2013
Model List
- A1 Schmetic Dig
- A7 Schmetic Dig
- A9 Sechmetic Dig
- A19 Schmetic Dig
- A88 Schmetic Dig
- A95 Schmetic Dig
- A97 Schmetic Dig
- C1 Schmetic dig
- C9 Schmetic dig
- C10 Schmetic dig
- C10+ Schmetic dig
- C17 Schmetic Dig
- C24 Schmetic Dig
- C33 Schmetic dig
- C44 Schmetic Dig
- C50 3D Schmetic Dig
- C60 Schmetic dig
- C70 Schmetic Dig
- C75 Schmetic Dig
- C88 & C88 I Schmetic dig
- C90 Schmetic Dig
- C100 Schmetic Dig
- C101 Schmetic dig
- C102 Schmetic dig
- C105 Schmetic Dig
- C111 Schmetic dig
- C201 Schmetic dig
- C202 Schmetic dig
- C203 Schmetic Dig
- C206 Schmetic Dig
- C207 Schmetic dig
- C260 Schmetic Dig
- C303 Schmetic dig
- C305 Schmetic dig
- C309 Schmetic Dig
- C337 Schmetic Dig
- C349 Service Data
- C350 Schmetic Dig
- C359 Schmetic Dig
- C360 Schmetic Dig
- C369 Schmetic dig
- C404 Schmetic dig
- C504 Schmetic Dig
- C550 Schmetic Dig
- C555 Schmetic dig
- C570 Schmetic Dig
- C606 Schmetic Dig
- C660I & C770I Schmetic Dig
- C705 Schmetic Dig
- C769 Schmetic Dig
- C770 DJ & C770N
- C770 Star Schmetic Dig
- C770, C66 ,C770M Schmetic dig
- C770N Schmetic Dig
- C909 Schmetic Dig
- C999 Schmetic dig
- C2000 Schmetic dig
- C2010 Schmetic diag
- C3030 Schmetic dig
- C5050 Schmetic Dig
- C5050i Schmetic Dig
- CT-1 Schmectic Dig
- i4 Schmetic Dig
- i9 Schmetic dig
- DOWNLOAD
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.
Subscribe to:
Posts (Atom)
