Eliminating the inverter board

[hansen01]

Re: Eliminating the inverter board

Good news. The lcd and sound still run without the inverter. Makes sense. The only thing connecting the inverter to the main board are two connectors with a bunch of grounds, an on/off, and some other things (VIN, Vsel, VEPWM, VIPWM). No clue what those are. I suppose they are to control the light level.

As a side note I may have found the original problem. There is a tiny fuse or something that seems to be burned out on the main board. It bridges away from one of the connectors coming from the inverter. I noticed it looked a little burned when I first opened the tv up but really took notice when it sparked every time the ccfls tried to light up.




I suppose if anyone knows what this is I could try to fix it. Otherwise with that issue (which may not fix the problem) plus a new ccfl bulb it may cost the same to install leds.

If I do install leds all I need to do is figure out which is the hot wire on that connector.

[tom66]

Re: Eliminating the inverter board

That's an inductor

Value ~1-4.7µH 1206.

[hansen01]

Re: Eliminating the inverter board

Any consistent reason why these go bad.

[budm]

Re: Eliminating the inverter board

Under sized, cold solder joints, shorted load?

[hansen01]

Re: Eliminating the inverter board

That sounds like a generic answer. :-)

BTW: Anyone have a good led supplier. I've shopped around but can't really find that "you can find any led here" type of place.

[budm]

Re: Eliminating the inverter board

Well it cannot not any more generic than that, all three of the above can cause it to burn up.

[cashkennedy]

Re: Eliminating the inverter board

If theres a short on the board replacing the inducor will be dangerous as it will likely explode again once you try the monitor again.

Im thinking , though budm knows more then me, that you should try testing the dc voltages to ground with the board disconnected and your meter on resistance? Try aranging the probes in both orders (red on ground vs black on ground)

If you are getting really low resistances from the voltages to ground then there probably a short. I think under 1000 ohms would be a bad sign?

If the part just went bad cause it was a little undersized / low quality, then replacing it should be fairly safe ... as in it will last a few more years