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Chinese Models & Cloned Phones All China Phone Platforms like (MTK, Spreadtrum.. etc.) Cloned Nokia Nokla & Motorola . etc. Phones are included |
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08-12-2010, 14:05 | #3 (permalink) |
No Life Poster Join Date: Nov 2008 Location: Anwar Telecom .DHAKA Age: 38
Posts: 1,581
Member: 896667 Status: Offline Sonork: 100.1586139 Thanks Meter: 1,596 | 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. |
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