Hi guys, I wanted to share with you my latest "repair".
I've bought a TDS744a oscilloscope from ebay that kept repeating the pattern of turning on, and then off in a quick cycle (you could hear the fan and see briefly the leds turning on right before it turned off)
Suspecting the power supply I went directly to it and sure enough, lots of damage around 3 caps (see attached pictures)
Remebering Dave's video on the shorted cap from a portable power supply, I kept removing the PCB until there was no more carbonisation (keep in mind that I'm learning electronics relying on what I learn from the internet, I have no formal studies on it, so my "knowledge" is 100% empirical)
I then replaced those caps and all the other ones from the power supply with the best brands I could find (I'm argentinian but living in Colombia, not easy to get parts around here) and rebuild the traces with wires and what do you know? It works!
I still feel that the repair was a bit ugly in terms of the wiring and the scrapping of the PCB but in the end, it's a nice addition to my hobbiest bench
The next step should be to upgrade it to a tds784 by removing the caps and resistor on the acquisition board, but I'll wait until I really need it (or have probs that could benefit from that...)
Sent from my Galaxy S8