Electronics > Repair

most broken equipment you run into?

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ifonlyeverything:

--- Quote from: Paceguy on December 10, 2023, 11:17:05 pm ---Lately, it's been much of the stuff that I purchase on ebay. Badly packaged by careless sellers

--- End quote ---

Went through this with SMPS transformer ferrites and AliExpress sellers. Three different sellers, in fact. Careless idiots.

DrijSkij:
I dumpster dived a TopWord 6306A from work a month ago. Both Master and Slave didn't work. When I got it home and turned it on there was some brief smoke coming out of the case.
After finding a schematic from this site that was pretty similar, but not exact to this power supply, I found that the first relay on the Master side was blown out. Then to find out the cause of it. It turns out one of the main power rectifiers coming off the big tramsformer was quite nicely shorted, and took out its anger on the poor relay.
So I replaced the relay(it cost about $1) and I found an old rectifier from work. Fixed it nicely.

Then on to the Slave side. This one took some time. After some serious examination, someone took out (desoldered) the two VERY necessary emitter feedback resistors following both of the large pass transistors. I couldn't believe it !  It was so neatly done and hardly noticeable. Initally I was angry and then it eventually became amusing.

AndyC_772:

--- Quote from: Zenith on December 09, 2023, 11:12:49 pm ---They said they almost all work. Most people get rid of them because they are too old.

--- End quote ---
I have a plasma TV in my spare room. It *almost* works perfectly, but under some circumstances shows a purple speckle pattern over bright parts of the screen.

Is it usable? Sure, I use it to watch Youtube videos whenever I ride my exercise bike. Most of the time it's perfectly fine. The image is a bit noisy, and of course it gets warm, but that's just normal for the age and technology of the set.

But is it worth *anything*? I doubt it. Couldn't sell it as "fully working" because it isn't. I think I paid something like £25 off Ebay for it, and that was about 4-5 years ago.

So, suppose I want the space, or a better TV. What would you do with it? I'm thinking the tip is a pretty attractive option.

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