Today, I have an exciting challenge on my hands: an LG device that has stopped working after overheating excessively. Since LG Electronics' announcement in 2021 to shut down its mobile phone division, many users have had concerns about the support and updates their existing devices will receive.
So I have decided to clarify if the overheating of this device is related to this decision or if it is a technical issue.
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The first step to understanding the problem is to use a multimeter. Connecting the charger and measuring the voltage at the battery connector, I found that there was no detectable voltage. However, when measuring the test points on the motherboard, I found a voltage of 4.66 volts. This tells me that current from the charger is getting to the motherboard. By measuring the bottom of the motherboard, I found a voltage of 1.75 volts at the power button.
In order to perform a full diagnosis, I decided to disassemble the motherboard for a visual inspection. That's when I noticed little tin balls on the SMD components. These spheres were scattered all over the board, suggesting that the device had overheated quite a bit. In other sectors of the device, I found the same pattern.
Although I would normally prefer not to work on a device under these conditions, I decided to take this opportunity to identify the problem and perhaps unravel a larger issue related to the planned obsolescence of LG devices.
The next step was to remove the shields with a mini Dremel and air station. Under a microscope, I could see more tin spheres. This observation led me to suspect that a software update may have caused damage to the motherboard.
When measuring next to the PM7250B IC, I discovered a short circuit across the capacitors. This caused a significant drain on the motherboard when I connected the charger to the mobile. Using a thermal camera, I was able to detect areas of overheating, particularly in the memory area.
After removing the memory, I found that the short on the motherboard was gone. I proceeded to reball the memory, but when I soldered it again, the short circuit reappeared. This suggests that the memory is internally corrupted, possibly from a shorted internal component.
That is all for today. My name is Leonardo and I'm here to help you understand mobile device problems and solutions. Stay tuned to my channel for more content like this and, of course, feel free to leave me your comments and questions. See you in the next video!
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17 окт 2024
