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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 12-21-2009, 06:50   #1 (permalink)
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@@@...How To Repair A Dead China Phone by [email protected]@@

How To Repair A Dead China Phone by mobi_soft

may be its helpfull to u all and all new members....

First we need to know why a phone is dead

1. For Software

2. For Hardware

1. For Software Flash is its final solution, but mtk cpu 90% phone done by format. if its MTK,SPD,AD, SI4904 cpu first try to format than try to full flash your phone with a good and perfect flash file. and other cpu haven't format option, so direct flash them. when you flash careful about original flash file version.

A. what you do before format or flash Always remember, before format or flash of your any china phone must first backup your currentflash file if phone is dead, also do it. because it will help to find its original flash file version and many other.

B. What you need for flash or format a china phone(1) Connecting device (also your can do it with usb to serial cable but a device/box can give you full/final solution)

(2) Phone TX and RX.
(3) Need to know phone cpu type/model, flash chip type/model, Flash file version.
(4) For Flash need a good flash file which same to your phone original flash file version.

C. What problem you face for wrong flash file

(1) phone still dead
(2) white screen
(3) keypad not work
(4) phone hang after power on
(5) keep restarting
(6) no network
(7) etc.

2. For Hardware
when a dead phone not possible to repair only with software you need to repair phone hardware.

Which hardware you need to check for dead phone(1) when you try to flash if phone not boot check power source/battery voltage/V+ pin in phone connector. just do confirm phone found enough voltage forsoftware operation.
(2) if phone power source is ok but still not boot, do confirm your tx and rx is 100% working/tested.
(3) if tx rx is ok, than check your phone connector, its tx rx pin is confirm connect with cable and internal connector pin is joint on pcb perfectly.
(4) if pin is ok, maximum china phone tx rx going to cpu after crossing a resistor or capacitor so check them.
(5) if resistor is ok now you need to check boot diod, all phone have no boot diod so last try is check cpu tx rx pin.
(6) if boot is ok but phone not receive flash file, maximum time this problem coming from flash ic or ram (maximum china phone flash memory and ram have in one chip). so you need to try first re-hot it if still not solve change it.
but its true flash chip/ram always show error not only for them, sometimes cpu to flash chip/ram connection lost for bad cpu pin or bad cpu soldering on pcb. so check both of them.
(7) phone flash ok but not power on (although file is 100% correct) , for it you need to check

Flash chip/ram (95% include in 1 chip)
Clock crystal and battery
26mhz (near rf ic)
Rf ic,
Power ic and v+/b+ way
Bt ic
Last try is cpu.

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Old 12-21-2009, 06:56   #2 (permalink)
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nice sharing brother
keep it up
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Old 12-21-2009, 07:02   #3 (permalink)
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thanks Brother Nice Post.............
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Old 12-21-2009, 07:14   #4 (permalink)
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@@...if u like my post,

just press "thanks"

[email protected]@
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Old 01-21-2010, 11:53   #5 (permalink)
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i changed cpu in x1i with new cpu6233ca . after changed not boot start , actul problem was mobile power on before change ic and i read flash file from this phone , now after replace cpu boot not taking , any other way to boot after change cpu?
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Old 02-03-2010, 02:58   #6 (permalink)
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mam what ru asking

endimam adugutunnadi?,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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Old 02-14-2010, 18:51   #7 (permalink)
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please help

i cant flash my 6300
ive found TX RX pinouts
im using UFS with FlashTool_v3.0936
cant read back or flash or format also tried spiderman , didnt work....
do i need to plug the battery or charger?
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Old 07-21-2014, 08:51   #8 (permalink)
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which box is perfect for all china mobile?
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