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ioanna.getfit
ioanna.getfit
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Tuesday 09 November 2021 07:52:48 GMT
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napoleonl
User🔞❌ :
🥰🥰🥰🥰
2021-11-18 06:24:36
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maria_livas
Livmar13 :
απο που προμηθευομαστε σκονη πρωτεινης;
2021-11-09 09:31:49
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Resurrecting a Dead iPhone 12 Pro Max: The Hidden Fault Revealed A fan sent us an iPhone 12 Pro Max that appeared brand new externally. He reported that the phone suddenly became extremely hot in his pocket and, after a while, wouldn't turn on. After speaking with him, we learned that he had purchased this carrier-locked device from a second-hand store. He now suspects there's something fishy about it, believing the seller might have sold him a refurbished or previously repaired phone. Determined to uncover the truth, we decided to open up the phone. Upon removing the screen and inspecting the internals, everything was exceptionally clean with no signs of prior repairs. We continued by removing the screen completely and connecting the phone to a power supply meter for testing. Pressing the power button, we observed the current jumping to 800mA before dropping back repeatedly - a clear sign that the phone wasn't turning on. Suspecting a short circuit within the motherboard, we proceeded to remove it for a closer look. The motherboard looked brand new, with no indications of disassembly or repair - contradicting the fan's suspicions. Testing the bare motherboard yielded the same 800mA current jump and fluctuations. This pattern typically suggests an internal short circuit. To investigate further, we needed to separate the double-layered motherboard. We carefully removed the waterproof foam and protective stickers, then used a hot air gun set to 350 degrees Celsius with a wind speed of 100 to evenly heat the motherboard edges and separate the layers. Focusing on the upper layer, responsible for logic and boot functions, we supplied power but still faced the same issue. Using a microscope, we meticulously examined the motherboard but found no visible abnormalities. Based on our repair experience, such current irregularities often point to a short circuit in the power supply paths of the hard drive or CPU. We removed the black adhesive near the hard drive and tested each surrounding capacitor with a multimeter - no issues there. Testing around the CPU yielded the same non-results. Puzzled, we placed the motherboard under a thermal imaging camera. Typically, with a high starting current, the motherboard should heat up upon booting. We noticed that only the CPU area heated up at the moment of the current jump. Could the CPU be damaged? Unlikely under normal circumstances. Before considering CPU replacement, we decided to test every capacitor on the motherboard. Finally, we discovered a problem with a small capacitor next to the USB management IC - it was grounded on both ends, indicating a short circuit. Checking the schematic diagram, we found that this path connected through the power supply to the ringtone IC and then to the CPU via a resistor. The shorted capacitor would pull down the CPU's operating conditions at startup, causing it to heat up and fail to boot. To confirm, we applied rosin to the shorted path and supplied power directly to it. A small capacitor melted quickly before our eyes. We removed it and tested the motherboard again. This time, pressing the power button showed that the phone could now turn on. Reconnecting the screen, we successfully booted into the system. A tiny faulty capacitor had almost led us to a misdiagnosis involving the CPU. We cleaned the lower motherboard thoroughly, re-balled it with solder, and reattached the upper and lower layers. After reassembling the phone, we tested all functions sequentially - everything worked perfectly. Finally, we reattached the waterproof foam and shielding stickers, installed the motherboard back into the casing, and reassembled all components.
Resurrecting a Dead iPhone 12 Pro Max: The Hidden Fault Revealed A fan sent us an iPhone 12 Pro Max that appeared brand new externally. He reported that the phone suddenly became extremely hot in his pocket and, after a while, wouldn't turn on. After speaking with him, we learned that he had purchased this carrier-locked device from a second-hand store. He now suspects there's something fishy about it, believing the seller might have sold him a refurbished or previously repaired phone. Determined to uncover the truth, we decided to open up the phone. Upon removing the screen and inspecting the internals, everything was exceptionally clean with no signs of prior repairs. We continued by removing the screen completely and connecting the phone to a power supply meter for testing. Pressing the power button, we observed the current jumping to 800mA before dropping back repeatedly - a clear sign that the phone wasn't turning on. Suspecting a short circuit within the motherboard, we proceeded to remove it for a closer look. The motherboard looked brand new, with no indications of disassembly or repair - contradicting the fan's suspicions. Testing the bare motherboard yielded the same 800mA current jump and fluctuations. This pattern typically suggests an internal short circuit. To investigate further, we needed to separate the double-layered motherboard. We carefully removed the waterproof foam and protective stickers, then used a hot air gun set to 350 degrees Celsius with a wind speed of 100 to evenly heat the motherboard edges and separate the layers. Focusing on the upper layer, responsible for logic and boot functions, we supplied power but still faced the same issue. Using a microscope, we meticulously examined the motherboard but found no visible abnormalities. Based on our repair experience, such current irregularities often point to a short circuit in the power supply paths of the hard drive or CPU. We removed the black adhesive near the hard drive and tested each surrounding capacitor with a multimeter - no issues there. Testing around the CPU yielded the same non-results. Puzzled, we placed the motherboard under a thermal imaging camera. Typically, with a high starting current, the motherboard should heat up upon booting. We noticed that only the CPU area heated up at the moment of the current jump. Could the CPU be damaged? Unlikely under normal circumstances. Before considering CPU replacement, we decided to test every capacitor on the motherboard. Finally, we discovered a problem with a small capacitor next to the USB management IC - it was grounded on both ends, indicating a short circuit. Checking the schematic diagram, we found that this path connected through the power supply to the ringtone IC and then to the CPU via a resistor. The shorted capacitor would pull down the CPU's operating conditions at startup, causing it to heat up and fail to boot. To confirm, we applied rosin to the shorted path and supplied power directly to it. A small capacitor melted quickly before our eyes. We removed it and tested the motherboard again. This time, pressing the power button showed that the phone could now turn on. Reconnecting the screen, we successfully booted into the system. A tiny faulty capacitor had almost led us to a misdiagnosis involving the CPU. We cleaned the lower motherboard thoroughly, re-balled it with solder, and reattached the upper and lower layers. After reassembling the phone, we tested all functions sequentially - everything worked perfectly. Finally, we reattached the waterproof foam and shielding stickers, installed the motherboard back into the casing, and reassembled all components. "OK, brother, your phone is fixed." Hashtags: #iPhoneRepair #TechFix #iPhone12ProMax #MobileRepair #TechSupport #ElectronicsRepair #PhoneRepair #DIYTech #GadgetFix #TechTutorial

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