Overheat cap and MOSFET with no HV

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7 months 6 days ago - 7 months 6 days ago #7985 by BS_Jim
Yeah, that's the way it works.

Hmm... no change... Is it making a loud whine? It should be silent. I don't suppose you have an extra IRF840 laying around. Also D1 could be damaged too. Both of them got really hot. I would think the coil is ok if you didn't let the smoke out.
I'm just guessing here. Both Q1 and D1 will usually either work or fail completely.

edit: What is your PWM on-time (setting #23 or #24) ? It shouldn't be over 200 in most situations. My clocks have always calibrated around 160-170.

Jim
Last Edit: 7 months 6 days ago by BS_Jim.

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7 months 16 hours ago #7987 by TechGuy03
I'm afraid to report that after 3 days, I found the Mosfet overheating... So substantially that it melted the solder.

Removal of it took the through holes with it.

So my board is destroyed now.

Funny - it still works just fine but I noted the odd coloring on the Mosfet. Touching it revealed the solder was wet and the Mosfet was hot.

Unfortunate to say the least... Looks like my mistake lead to multiple component failures as well as destroying the pcb.

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7 months 9 hours ago #7988 by BS_Jim
Sorry to hear that. Hopefully, you've still got the half-unpopulated board and you can buy the rest of the parts. Save the tubes!!

Jim

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