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Old 3rd Dec 2023, 12:18 am   #1
Join Date: Mar 2015
Location: Lefkada, Greece
Posts: 969
Default Sony SL-T50ME dead after power surge

Hello. As the title says, my precious Beta VCR's power supply died after a problem with my area's power grid which caused the mains voltage to flactuate. There is a really bad burn mark on the mains fuse, and I found the two switching transistors completely shorted. After removing the transistors from the board I can no longer measure any shorts in the primary. Luckily I had a spare power supply from a scrap machine and I confirmed the machine is working fine with that installed, but it would still be nice to repair this one. Does anybody know of a reliable source for these transistors, as I see lots of Chinese knock-offs flooding the market lately? They are both 2SC3158.


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dj_fivos_sak is offline   Reply With Quote
Old 3rd Dec 2023, 12:46 am   #2
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,151
Default Re: Sony SL-T50ME dead after power surge

Please note that these are 2SC3158L with the letter L designating the hFE class which is usually important in those Sony designs. Replacements by Inchange Semiconductor are usually unsuitable. You might be able to use genuine MJE13006 as a substitute, but pay attention to the hFE.
Maarten is offline   Reply With Quote

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