Hello everyone,

I have several boards from my customer, and all of them have burned components on the high voltage side, including transistors, capacitors, and resistors. I replaced all the burned components, and the boards are back to working condition. However, in the output, I'm getting 10.5V, but when I connect the TEC, it drops to 3.3V.

I’ve already replaced all the electrolytic capacitors, but the problem remains the same. I'm testing the boards without any connections on the connectors, just plugging them into wall power and measuring the output voltage. I believe I should be getting 12.6V.

What could be the reason for this, and has anyone else encountered a similar problem?

 

Can you post photos of your boards?

 

Hello everyone,

I have several boards from my customer, and all of them have burned components on the high voltage side, including transistors, capacitors, and resistors. I replaced all the burned components, and the boards are back to working condition. However, in the output, I'm getting 10.5V, but when I connect the TEC, it drops to 3.3V.

I’ve already replaced all the electrolytic capacitors, but the problem remains the same. I'm testing the boards without any connections on the connectors, just plugging them into wall power and measuring the output voltage. I believe I should be getting 12.6V.

What could be the reason for this, and has anyone else encountered a similar problem?

My boards have sticker that says 10.5V, indicating that the assembly is set to 10.5 volts output. The 12v fans all run at 10.5 volts also.