I have achieved the greatest feat of my project life. A family had a big screen tv, a 1997 Hitachi, and their house got hit by lightning. They got the tv appraised to be fixed for 500 bucks, so they just got it replaced with a plasma. They put the old one on craigslist, and I picked it up and proceeded to repair it. I actually only spent 50 cents on replacement fuses. The feeling of achievement is awesome, I know that not even my biggest supporters believed I could do it; people recognize I have lots of talent and experience but still think I'm an amateur. A tv must be far too complicated. Well, I figured it out and now it works so BOO YA.

This is the TV so you can see it, it's 52 inches and all put back together.

Here you can see us playing Wii on it. The yellow bar on the top is a normal progressive scan, take a photo of any big screen tv or tube tv and you'll see something similar. Like how we have 2 huge TV's right next to each other, one for games and one for tv.

This is a diagram from the service manual which explains the diagnostic LED system, I had to understand about 60 pages of this.

Here, you can see the 2 main fuses, both fine. S901 is a relay switch for the power, it's ok. T901 is the transformer, it gets warm. Also, I901 is the mystery part all of my functional diagnosis flow charts point to, so for a while I thought that was the problem.

Here's what was strange. The protect LED was on, but leading to this circuit is F903, a fuse, which is circled on the left. I've never seen a fuse like this, how do I know if it's blown? It has no continuity across it, so I think that's it, and I'm gonna replace it with a socket and real fuse as my next step.

More pics of the board, I had to replace those 2 fuses and that did the trick. Hardly a 500 dollar fix, wouldn't you say?

This is another view of the board, as a reference. It's the whole power circuit.

This entry was posted on Saturday, March 3rd, 2007 at 4:32 pm and is filed under Projects.
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