Chosen Solution

Dear Community, My phone doesn´t turn on! No light on the screen and no one at the buttons! I tried to get into the download mode, (with button-combinations) didn´t work! Bought a USB-JIG adapter (also for download mode), hasn´t work! My battery is not defective. COMMUNITY, I REALLY REALLY WANT TO SAFE MY DATA, WHAT SHOULD I DO?? Since 3-4 months my phone doesn´t turn on!!! :( I would be really happy for any response from you guys! (Ich spreche auch deutsch) JOJO

Is the phone, when plugged into a computer, seen by the computer? have you tried charging the battery from a different phone and then putting in the battery ? The charger port could be the issue .This shows how to replace it Samsung Galaxy S II Micro-USB Port Replacement You can by anew one from ebay oramazonHope this helps

If you want to test it down further more hardware wise. Get a multimeter and measure the positive and negative pins on the battery (It should be around 3.7-4.2v to indicate that it has enough charge to turn the phone on). Also check the positive and negative pins at the same spot on the battery connector pins on the phone while the charger is plugged in and they should read a good voltage amount somewhere around 4.2v probably, if there is like 1v or a very low number or even 0v then there is a charging circuit issue, usually it’s the charging port if it’s physically damaged.

So to check power management chip IC you will need to:

  1. Plug the phone into charger (use the charging cable)
  2. Make sure no battery installed
  3. Get a digital multimeter
  4. Set it to digital voltage mode (The icon with the up and down square and not wavy line) For the next step there are 4 terminals, just match to the battery’s positive and negative symbols on the battery itself.
  5. Put black probe on the negative symbol (from battery) lining up for the battery connector terminal on the phone.
  6. Put red probe on the positive symbol (from battery) lining up for the battery connector terminal on the phone.
  7. Read what is on the digital multimeter it should be reading some voltage like 3.7v-4.2v to indicate that it is charging the battery fine.
  8. If no read voltage like that then power management chip is most likely bad. For the step below, the first and last charger port pins need to be measured (leftmost and rightmost pin)
  9. To confirm this you will need to measure the charging port pins itself, if they read between 4.0v to 5.0v then power management ic is bad.

@helpmejojo just to augment the two prior answers. You need a multimeter so that you can measure the components. Follow the troubleshooting from Samsung for a “No-Power” situation.