Hello, all! I just found this forum and I think I'm gonna like it here :) I have been tinkering around with arcade video game monitors for a while, and have a fair grasp on the basic concepts. A couple weeks ago, someone posted a free non-working projection HD TV set (Toshiba 46HX83) in the local CL, and I figured what the heck, might as well see if I can do anything with it.

It looks like there's a little issue with the power supply board. Take a look at the attached schematic if you wouldn't mind.. C809 and C810 are ruptured, F860 is blown to kingdom come (can't even find it!), and Q801 (the big multi-function voltage regulator) has a big hole in it. The rest of the board, the whole TV in fact, looks pristine. Everything upstream of this circuit is just passive components.. The incoming AC line voltage goes through two transformers, and then two relays before it gets to the part you see, with a handful of caps and resistors here and there. The first solid state part it sees is the rectifier, D801. The AC from the transformers feeds a bunch of other circuits too, all of which look fine, so I'm assuming this failure can't be explained by a lightning strike or power surge.

Anyway, I'm thinking I'll replace the obviously-damaged parts, and probably the bridge rectifier too. The caps and fuse can obviously be found anywhere, but the regulator IC and possibly the bridge rectifier (or is there nothing special about this one?) are proving to be a little harder to find. Do I have to buy these from Toshiba, or is there a better alternative?

There's a chance the set will work find after changing those parts. That's one of those situations where you just have to take a chance. If lightning or a power surge hit the set, it could have stopped with these parts or it could have gone deeper. The only way to know would be to replace the known defective parts.

www.tritronicsinc.com may have that regulator. Also, use caution when buying these types of parts. Many discount parts houses sell inferior generics or rejects at reduced prices. I've found out the hard way that such parts will often bite you in the butt. I've had them short either instantly or after a few minutes of operation and I've had them to simply not do anything. It's best to stick with first rate parts in this situation.

F860 is blown to kingdom come reminds me of a bad lightning strike come to think of it thats more than likely what happened. steve

well what makes me hopeful that this didn't happen is the fact that several other circuits that are fed from the same transformer pair, with much less beefy-looking components, look fine. so i'm naively hopeful that the damage is localized to this one circuit.