In July 2010, I received a repair request from a Thomson customer. The issue was with their Thomson TP4312D projection TV, which wouldn’t turn on at all. Typically, when a TV doesn’t power up, there are two main scenarios: either the power indicator is on but the TV doesn’t boot, or the indicator is completely off and the TV doesn’t respond. After contacting the customer, they confirmed that there was no power display and the TV didn’t turn on at all.
Based on my experience, this kind of issue often points to problems in the power supply or system control unit. When I arrived on-site, I checked the +5V power supply and found it to be normal. The CPU’s power supply also seemed fine. However, during a static resistance test, I noticed that the resistance on the CPU and RAM address lines was unusually low. I replaced the RAM, but the problem persisted. Given that the CPU had over a hundred SMT pins, it was possible that some of them were not properly soldered.
After removing the peripheral components and testing again, I still couldn't get the TV to power on. So I decided to replace the CPU. I carefully desoldered the old one using a proper tool, installed a new one, cleaned the board thoroughly, and let it dry before powering it back on. To my relief, the power indicator lit up normally, and the TV booted up with a clear image and sound.
One important note: the CPU in this model is surface-mounted, and the copper traces underneath are very thin. It's crucial to manage the soldering time carefully—too long and you risk burning out the board. Also, avoid applying too much solder near other components, as it can cause short circuits. The CPU is located very close to other parts, so precision is key.
Although I have extensive experience working with Thomson devices, I always welcome the chance to learn more. If anyone is interested, feel free to reach out to CSC for further discussion.
Unfortunately, I've been frustrated by others copying and altering my work without permission. A few years ago, a repair company called Hongsheng copied my content, and this behavior continues to happen. It's disappointing to see such actions in the repair community, where people usually share knowledge openly and honestly. I strongly condemn this kind of behavior. If it keeps happening, it will discourage people from sharing their experiences and harm the overall growth of the industry.
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