A cellular smart-phone can get useless for several motives:
If the cell cell-phone receives dropped down on the floor or
on a few difficult floors.
If the cell phone gets moist or is dropped in rain or water.
If there is any kind of quick (in + and –) or shorting
inside the Mobile Phone PCB.
Mobile Phone Dead
Problem and Solution – How to Repair a Dead Mobile Cell Phone
1. Remove the
battery and see if it gets charged or no longer. Check voltage the use of a
Multimeter. Voltage ought to be three.7-four.2 Volt DC. Use a Battery Booster
to Boost the Power of the Battery and Charge it once more.
2. Check Battery
Point and Battery Connector. Clean Battery Point and Battery Connector to
dispose of any carbon deposits.
3. Resold or
exchange the Battery Connector.
4. Insert charger
and see if the “Battery Charging” seems or no longer. If there's an icon of
“Battery
Charging” but the cellular smart-phone does not get switched ON then
check ON / OFF Switch. The voltage of ON / OFF Switch needs to be 2.5 to three. Five
Volt (DC). Clean or alternate the ON / OFF Switch. Check to the music of ON / OFF
Switch and Jumper if required.
5. If the
charging icon is not there then take a look at the voltage of ON / OFF Switch.
If the voltage is between 2.5 to three.7 Volts DC, then RELOAD Software in the
Phone (Software Flashing).
6. If the cell-phone
gained’t get switched ON even after reloading software program then Heat the
C.P.U, Power IC and Flash IC.
7. If there is no
voltage at the ON / OFF Switch then test tune of the ON / OFF Switch. Jumper if
required.
8. If the problem
isn't solved then Heat, Reball or Change the Power IC and CPU to fix the
problem.
9. Keep the
Multimeter on Buzzer Mode and Check + and – of the Battery Connector. If there
is Buzzer Sound then the Phone is brief. If there is brief on the Battery The connector then cleans the PCB with thinner. Apply Flux and Heat the PCB.
10. If this
doesn't restore the Mobile Phone Dead trouble then eliminate the PFO and test
for short. If there is brief then update the PFO.
11. Remove the
charging connector and check for shorts. If there is brief then exchange the
connector.
12. Remove the
charging IC and take a look at for shorts. Change if required.
13. Remove the
Bluetooth IC and check for shorts. Replace if required.
14. Remove the
Power IC and check for shorts. Replace with a brand new one if required.
15. Remove the
CPU and check for shorts. Replace if required.
16. Remove all of
the Big Electrolytic Capacitors and check one by one. Replace capacitors if
required.
Important Note
• Some the cellular phone receives lifeless if the RTC (Real Time Clock) is defective. This takes place frequently in China Mobile Phones. Change the RTC to fix the
hassle.
• If the
cellular smart-phone receives hang after reloading software then alternate the
RTC.
• If the
cell-phone remains useless then test by means of changing the 26 MHz Crystal
Oscillator.
1 Comments
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