I used & worked OK red board the issue comes when I changed the power Tx, before 240VAC unknown power but surely 50W ore less now 200VAC 100W.
The leds must light up, nothing must poof, and the voltage across R3 should be ~279V for ~5mA through the leds, in case of success. You did not tell me if you have no continuity between Mosfet tabs and sinks. Your sinks touch and its dangerous if there is a leak there.
Also there is some weird grey thing between your MJE transistor and a sink in your photos, what is that? Clean that area. MJE's back should not touch anything around it.
No continuity between any pin mosfet & screw, also no continuity between tab (mosfet hole) & screws, that's OK?
Removed and soldered a new one, see attached pic, it's OK?
Attachments
Last edited:
Scratch the sinks a little so you have some shiny scratch. Put the Ohm meter between metal tab of each Mosfet and its exposed sink's metal. Must read very high (open circuit).
Looks much cleaner. From that angle seems it does not touch the sink although very near.
Gotcha, there is continuity between metal tab IRF9610 & his own heatsink also IRF840
Last edited:
LEDs lit a few seconds, R1 burned again😡
While connected I read 140V at the dummy load but fixed Vout value can not adjust with trimmer inmediately R1 burned.
While connected I read 140V at the dummy load but fixed Vout value can not adjust with trimmer inmediately R1 burned.
Last edited:
Have you taken out and measure ALL the semiconductors and make sure they are OK? Do that before next try.