This is a common accessory problem. It can originate from a damaged capacitor or other passive element (even on flex cables). Unfortunately, diagnostics require several devices, as well as the repair itself. I suggest you find a good repair shop (the previous one is not good, since you were treated like that. Besides, I don't think anyone there knows what to do).
If you decide to repair on your "own kitchen table", you need to know that some workshop equipment would be useful, which will effectively speed up or even enable the correct diagnosis. However, the costs will be high, so repairing in an already existing repair shop is a better idea.
''tip: always start and finish job with disconnecting the power source (battery or workshop power supply). A mistake can cost you dearly - this is one of the most important rules for safe work in a microelectronics workshop. The second - to protect the device against ESD - put on nitrile gloves or an effective anti-ESD armband on your hands. Most of the ESD damage cannot be repaired.''
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However, if you are stubborn and you want to do diagnostics yourself (which I encourage you to do), disconnect everything from the motherboard except for two screen tapes (touch + video) and the battery. Start the phone and check its operation. If it's ok, turn off the phone, disconnect the battery and connect the next element to the system. Of course, at the end, connect the battery and start the phone. Check its operation. Follow these steps until you run into a problem. I would expect problems with the one of camera, but the charging tape can also be the cause. Your experiences you write about at the beginning will be important. It is all very important. More tips can be found on my blog [link|https://studionapraw.pl|studionapraw.pl] (use the translator - I am writing this for my local community in the EU).
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However, if you are stubborn and you want to do diagnostics yourself (which I encourage you to do), disconnect everything from the motherboard except for two screen tapes (touch + video) and the battery. Start the phone and check its operation. If it's ok, turn off the phone, disconnect the battery and connect the next element to the system. Of course, at the end, connect the battery and start the phone. Check its operation. Follow these steps until you run into a problem. I would expect problems with the one of camera, but the charging tape can also be the cause.
hello brebdeb,
This is a common accessory problem. It can originate from a damaged capacitor or other passive element (even on flex cables). Unfortunately, diagnostics require several devices, as well as the repair itself. I suggest you find a good repair shop (the previous one is not good, since you were treated like that. Besides, I don't think anyone there knows what to do).
If you decide to repair on your "own kitchen table", you need to know that some workshop equipment would be useful, which will effectively speed up or even enable the correct diagnosis. However, the costs will be high, so repairing in an already existing repair shop is a better idea.
''tip: always start and finish job with disconnecting the power source (battery or workshop power supply). A mistake can cost you dearly - this is one of the most important rules for safe work in a microelectronics workshop. The second - to protect the device against ESD - put on nitrile gloves or an effective anti-ESD armband on your hands. Most of the ESD damage cannot be repaired.''
However, if you are stubborn and you want to do diagnostics yourself (which I encourage you to do), disconnect everything from the motherboard except for two screen tapes (touch + video) and the battery. Start the phone and check its operation. If it's ok, turn off the phone, disconnect the battery and connect the next element to the system. Of course, at the end, connect the battery and start the phone. Check its operation. Follow these steps until you run into a problem. I would expect problems with the one of camera, but the charging tape can also be the cause. Your experiences you write about at the beginning will be important. It is all very important. More tips can be found on my blog [link|https://studionapraw.pl|studionapraw.pl] (use the translator - I am writing this for my local community in the EU).
regards, fingers crossing