Re: Repairing Bestec TFX0250D5W

Momaka, Thanks for your help with this PSU. The lamp worked wonderfully, although turns out I didn't have any issues when the PSU came to life. I ended up replacing the two MOV, using parts you suggested, the fuse, bridge rectifier and TNY276PG. Overall I'd say the PSU took the lightning strike pretty well. Momma "O" will be tickled pink to get her computer back .

Re: Repairing Bestec TFX0250D5W

I love J.R.R. Tolkien!!!!!!!!!!!

Re: Repairing Bestec TFX0250D5W

PeteS, the inrush thermistor measured 3.4 ohm. There is no damage on it but some white adhesive is on it.

BTW, tried to do some testing while waiting for the MOVs to come in and blew the 5v stand-by control chip, U2 (TNY276PN). Ordered some of these too. I had replaced the bridge rectifiers diodes and fuse and the chip blew as soon as I plugged the PS into the outlet. I hope it was already damaged and I don't end up blowing up the new chip.
The hot side power was normal when I checked it after the chip blew....

Re: Repairing Bestec TFX0250D5W

Finally, pics attached....

Re: Repairing Bestec TFX0250D5W

Thanks momaka, this is good info. The computer, and several household appliances and the air conditioner sufferd from a surge during a thunderstorm. Not my house, my brother-in-law's mothers house. If that wasn't bad enough, the power company was trying to restore power while her power meter box was ripped off the house by a tree limb, and exposed wires were on the ground shooting sparks. I'm trying to get the PC running again so she can play her games. Also, I know I could just replace the power supply, but this is a bit of hands on education for...

Re: Repairing Bestec TFX0250D5W



Not able to upload pics right now...

Re: Repairing Bestec TFX0250D5W



I also have a Bestec TFX0250D5W and need some info on replacement MOV. I have two blown MOV and I can see some info on one of them, TRV 07241, but I'm not finding this available in the USA. Shipping from outside the USA takes too long right now so I would like to find an equivalent replacement.

The MOV are ZR1 & ZR2, they are connected to the wire coming from the voltage selection switch, and to + voltage and ground, after the bridge rectifiers. Pics attached....