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Tulip TCX17 AT Power supply

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First post, by PD2JK

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Dear Vogoners,

I'm trying to repair a dead Tulip TCX17 AT power supply. I already replaced that capacitors because they were leaking. I tested the remaining caps on ESR and capacitance, they are fine.

At the moment I am running the power supply with two old HDDs as load. The +5V rail is ok, but the +12V starts with 8V and now 10 minutes later, it reached 11,96V and is still rising a bit.

It looks like a transistor is having trouble to deliver the voltage? Does anyone have experienced such behaviour?

i386 16 ⇒ i486 DX4 100 ⇒ Pentium MMX 200 ⇒ Athlon Pluto 700 ⇒ AthlonXP 1700+ ⇒ Opteron 165 ⇒ Dual Opteron 856

Reply 1 of 1, by PD2JK

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Replaced everything with a TO-220 package (MOSFET, thyristor, diode IC). Also measured all the diodes and resistors, all good.
It's up and running again.

The attachment DSC_6315.JPG is no longer available

(286 16MHz, 1MB RAM, WD90C31-LR 1MB VGA card)

I was amazed how fast I got all the stuff from Digikey. Within 44 hours the package went from the US to Köln, Germany, to NL.

i386 16 ⇒ i486 DX4 100 ⇒ Pentium MMX 200 ⇒ Athlon Pluto 700 ⇒ AthlonXP 1700+ ⇒ Opteron 165 ⇒ Dual Opteron 856

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