Yesterday, I picked up a Panasonic color TV model TC-2588 from a collection of 50 units. The casing looks clean and well-preserved, which was a big plus. I opened it up last night after work, and the three main boards seem to be in good condition with no visible faults. The power supply uses a STR-S6307 IC, and the fuse is intact. I checked the voltage on Q804, Q826, and Q827, and they all look okay. However, the base voltage of each protection transistor fluctuates between 0.5V and 0.9V—this is unusual since it should normally be around 0V. When I connected a 100W incandescent bulb as a load, it didn’t light up at all, which suggests that the power supply is still not working properly. Since the power supply isn't functioning correctly, I decided to check the protection circuit. After carefully examining the board, I noticed that all three transistors are tripping simultaneously, which makes me suspect the optocoupler D836 (TLP621). I removed it and tested the resistance between pins 3 and 4, which came out to about 350 ohms—way lower than the normal value of around 10k ohms. The power supply itself seems fine, so I moved on to check the rear stage. There's no obvious short circuit, but when I connected the load, the screen showed a red raster with snowflake noise. Could this be due to an old CRT aging? The R-gun voltage is only around 60V, and the red picture tube appears darker and hotter than the other two. When I turned the TV on, the black-and-white image looked normal, and the AV input produced bright colors with good brightness and contrast. I'm a bit confused about whether this TV is worth keeping or if I might end up losing money on it. It’s an old machine, so maybe the CRT is just worn out. Still, I think it's worth trying to fix it further before deciding. I’m thinking about how much this unit is actually worth, and I’m not sure yet. Maybe I’ll try replacing the optocoupler first and see if that fixes the issue. If not, I might need to dig deeper into the power supply or even consider replacing the CRT if necessary. The residential energy storage battery Pack is designed to provide an efficient and reliable source of power for residential buildings. Our battery pack operates at a nominal voltage of 48V or 51.2V, providing enough energy to power your home for extended periods. Our Residential Energy Storage Battery Pack comes equipped with advanced technology that allows it to store energy from various sources, including solar panels, wind turbines, and the grid. This battery pack is perfect for homeowners looking to reduce their dependence on traditional power sources and take advantage of renewable energy. Residential Energy Storage Battery Pack,Lifepo4 Battery Pack Home Backup,Lifepo4 Battery Rack Home Energy Storage,Residential Wall-Mount Battery Storage JIANGMEN RONDA LITHIUM BATTERY CO., LTD. , https://www.ronda-battery.com