Help identifying a blown transistor
On Friday, 30 August 2019 20:32:02 UTC+1, wrote:
If it's just the supply that's fried who knows, might work. Can you not find other dumped electronics?
So I have some good news ... I managed to find AC-DC adapter that I could change the output voltage on and changed it to 15V and figured I have nothing to loose, so I connected it to the main intercom board, which then power up and the screen came on. Seems to be working 100%.
This means that either I have to take out the old SMPS board and just wire this adapter directly to the main board (I suppose not ideal) or I need to find a 220V to 15VDC PCB that will fit in the intercom shell/body (seems to be a bit of a low profile board, since the intercom is very flat).
Thanks for the help and I'll definitely try to find some other e-waste that I could use to learn while trying to fix it as well.
Great news. Reminds me of a Sony TV with a large PSU board. Replaced the lot with a rectfier, caps & lightbulb.... as an experiment. It worked, but not ideally.
NT
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