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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Chinese Models & Cloned Phones

Chinese Models & Cloned Phones All China Phone Platforms like (MTK, Spreadtrum.. etc.) Cloned Nokia Nokla & Motorola . etc. Phones are included

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Old 08-12-2010, 13:37   #1 (permalink)
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g five keypad not working


in a g five change display after 1 day all keys not working formate set but same wash board give some heat but same plz guide m
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Old 08-12-2010, 13:47   #2 (permalink)
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dear 1st change keypad strip if not ok then rehot uem ic ur problem will b solved 100%
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Old 08-12-2010, 14:05   #3 (permalink)
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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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Old 01-30-2013, 16:50   #4 (permalink)
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which model


it's logic system or direct adjust pcb ???/
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