My whole house video amp has conked out. It works for a while then quits. When it does the LED goes out. So I opened it up to see what I can see. There are three 'STONE' brand 'lytics (2x 100uf and 1x 10uf). They are a bad brand but read ok with a capacitance meter. I would just shotgun some new ones but It seems this board won't come out without un-soldering all of the connectors (I removed all the screws but it wasn't budging.
So I looked at it some more and the 4 pin SMD transistor looking thing with the markings "DL 28" looked a little suspect. I thought maybe it was just a bad solder joint so I touched it up and the amp came back to life. So I left it plugged in on the bench but when I came back after a while the LED was out again. So in looking at it some more, it looks like it got hot and touching it confirms this suspicion. It has a steady 12v going into it but the output is fluctuating. When it is working, 9v is coming out and feeding down to the LED and the row of 5 more SMD transistors above the two 'lytics.
So this seems like it could still be a easy fix if I could find a replacement for that flaky transistor. I have some chipquik so I think I could pull off replacing it.
Any thoughts? How would I track down an equivalent part on digikey?
So I looked at it some more and the 4 pin SMD transistor looking thing with the markings "DL 28" looked a little suspect. I thought maybe it was just a bad solder joint so I touched it up and the amp came back to life. So I left it plugged in on the bench but when I came back after a while the LED was out again. So in looking at it some more, it looks like it got hot and touching it confirms this suspicion. It has a steady 12v going into it but the output is fluctuating. When it is working, 9v is coming out and feeding down to the LED and the row of 5 more SMD transistors above the two 'lytics.
So this seems like it could still be a easy fix if I could find a replacement for that flaky transistor. I have some chipquik so I think I could pull off replacing it.
Any thoughts? How would I track down an equivalent part on digikey?
Comment