Thermaltake TR2-420 blown!

[goodpsusearch]

Re: Thermaltake TR2-420 blown!

They were blown and replaced with 2x 13009 TO-220 by stefos. The replacement transistors were tested by me and found good.

[c_hegge]

Re: Thermaltake TR2-420 blown!

Wow. Looks like you gave a few bad components there. I assume the switchers are blown too, as the PCB looks discoloured around where they were.

[goodpsusearch]

Re: Thermaltake TR2-420 blown!

The blown parts..

The resistor cut itself in half during desoldering..

[goodpsusearch]

This psu is identical with this, I already recapped and improved.

I got it from a friend (stefos) that already gave it a try but couldn't fix it.

I removed the caps except some not important small caps that tested good, removed the primary heatsink, then started testing parts.

As you can see in the following photos there is damage both in primary and secondary.

The diode with the red color in BOARD3.jpg is shorted and the transistor near it with orange color is bad, even though not shorted or open circuit.

On primary section (BOARD4.jpg) there are 2 resistors burnt and failed open. Their values were 1 and 10 ohm.

The 2 diodes with orange color have been tested and found ok but I am thinking about replacing them, as they might be leaky (?)

Any opinion / comment welcome