Samsung SGH A707 Troubleshooting

Phone won't turn on ¶ 

No matter what you do, you can't get your phone to turn on.

Drained/bad battery ¶ 

1) Remove the battery.

2) Test the battery with a Volt meter.

3) If voltage is lower than 3.5V, the battery is bad.

Plug the charger to the phone and try to turn it on.

If phone turns on, either the battery is bad and and must be replaced or the connector between the battery and power pin is bad.

Bad Connector for battery ¶ 

1) Remove the battery.

2) Test the connector using Ampere meter.

3) if Amp is 0.0 the connector is bad and must be resoldered.

Display is bad ¶ 

It is possible that nothing appears to happen because the display is bad and must be replaced.

Check if there is any light flash when you try to turn on your phone.

Bad Logic board ¶ 

Even if the logic board is bad when try to turn the phone on, you should still be able to observe some reaction.

Just replaced Logic Board.

Bad Power key ¶ 

If there is no reaction when the power key is pressed and none of the problems above are detected it is most likely the power key is bad and must be replaced.

Phone is not charging ¶ 

The charger is connected but the phone does not charge.

Bad Battery ¶ 

1) Remove the battery.

2) Test the battery with a Volt meter.

3) If voltage is lower than 3.5V the battery is bad and must be replaced.

Bad Charger ¶ 

Test the charger with a Volt meter. There should be a sticker specifying the output voltage.

This is typically 5 Volts. If the voltage reads 0.0V, the charger is bad.

An alternative is to test with another charger of the same type.

If the phone chargers with a new charger, the old charger was the problem.

Bad Charging Port ¶ 

Perform an eye inspection of the charging port.

Check if the charging pin is bent or missing.

If so, the charging port is bad and must be resoldered.

Key Pad is not working ¶ 

Your key pad is not responding

Bad Circuit ¶ 

Check if none of the keys work or just some.

If none of the keys are working, it is likely a short circuit in key pad circuit replace the logic board should fix it.

Bad Key Pad ¶ 

If some keys still work, it could be water damage. The dome switch under the keypad is not working.

Bad Connection ¶ 

If keypad doesn't work horizontally or vertically, it must be a soldering problem. The small parts around the CPU are not connected and need re-soldering.

No Service ¶ 

''If you cannot connect or the bars are always very low.'

Antenna ¶ 

If there is still connection, but it is very weak, the antenna may not be connected properly.

Bad Oscillator ¶ 

If you recently dropped the phone, it is likely the oscillator is broken.

Bad Logic Board ¶ 

If none of above is the case, it is most likely a bad logic board and must be replaced.

No Sim ¶ 

Display shows No SIM after turned on

Bad SIM Card ¶ 

Try to test your SIM card on a different working phone. If No SIM is displayed on the other working phone, you have a bad SIM card and need to request a new SIM card from your service provider.

SIM pin is broken ¶ 

Perform an eye inspection of the SIM pin. If any of the pins are missing or bent, you need to replace the SIM pin.

Bad Connection ¶ 

If none of the above seem to be the problem, the SIM tray is likely not well connected to the main CPU and must be resoldered.

No Sound ¶ 

If your phone is not making any sound.

Bad Ear Speaker ¶ 

Try to connect an external speaker to the phone.

If the external speaker works, it is likely a bad ear speaker and must be replaced.

Bad Logic Board ¶ 

If the external speaker does not work, it is likely a bad logic board and replace the logic board should fix it.

Others Cannot Hear You ¶ 

If other people cannot hear you on the phone.

Bad Internal Mic ¶ 

Try to connect an external mic to the phone.

If the external mic works, it is likely a bad internal mic.

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