Yesterday afternoon, a Toshiba 37A3000C LCD TV was brought to me for disposal. This person is quite familiar to me since many of the used appliances in my store are bought from him at low prices and then resold. We have a cooperative relationship. The TV he brought this time looked relatively new. He told me he had recovered it from a user’s home for 200 yuan. The issue was a white screen — he could only see a faint background. He really liked the TV and wanted to fix it himself. Normally, the repair cost would be over 300 yuan, but because we work together and it was for his own use, I offered to fix it for 200 yuan without replacing any major parts. He was happy with the deal.
After he left, I tested the TV again and noticed that both the background image and the system menu were gray. My initial thought was that the problem might be with the logic board or the screen itself. I opened the back cover and located the logic board, which was enclosed under the upper metal plate.
Upon removing the logic board, I carefully examined it and noticed that the AS15 chip had a slightly dark and uneven surface, which made me suspect it had been overheated for a long time. That raised some red flags. I decided to replace it.
Before removing the AS15 chip, I made sure to secure the nearby small components like resistors and capacitors using masking tape. Otherwise, they could easily be blown away by the hot air gun. I set the hot air station to a high temperature but kept the airflow moderate so the heat would concentrate and reduce the heating time, protecting the circuit board better.
Once the chip was removed, I used a soldering iron to trim the pads for easier re-soldering. When placing the new chip, alignment was crucial. I started by fixing two corners, then applied solder around the edges using the drag welding method. I added rosin or solder paste continuously during the process to ensure good flow. If there were any leftover solder on the corners, I used a soldering iron with tin wire to clean them up carefully until everything was smooth.
After the soldering was complete, I used a magnifying glass to check for any short circuits or issues. Everything looked good. I then reinstalled the board and powered the TV on. To my relief, the blue screen appeared, and the previous white screen issue was completely fixed. The signal test also showed normal results.
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