Insignia ns-42pdp (lg pdp42x30000)

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Vy is still at 025..adjust the pot and nothing really happens..meter will bounce 024-025

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

wait...I was wrong on 2 of the mosfets...
1 of them is bad..on all G,D and S

Now for the other 2 FDA59N25 Mosfets,
I get NO readings at every configuration of test leads except when neg is on D and pos is on S...I get a reading of 507 on both of these mosfets..

There was a small layer of solder on the bottom of the mosfet that I didn't notice until I looked over them again..causing the short.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

When I reinstalled the Y board I got nothing on the screen...I then reinstalled the Y buffer and when I powered up the tv I got a small flash from the screen..you could see snow momentarily and then the screen would go black. I got this 3 times powering on the tv.

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok, that means only one is failed (which is expected)

Did you get -Vy when the short was removed?

If -Vy is good: There's no harm in trying if the circuit is already bad: Install the two good ones. See if you get an image on the panel. If you do, turn the TV off, and order all three as replacements (possible that the others have been "wounded" by the other failure so for continued longevity, I would always replace the set.)

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

The Vy was at 025...am I looking for a -200?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Hopefully -200V. But if it's still at ~25V there is a further fault on this board.
Maybe time to look at the -Vy module but I've never heard of a repair of one of the modules.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Just to make sure...what setting should be used on the meter to measure this?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

The highest available DC volts range (usually 600 or 1000V)

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok..I put the 2 FDA 59N25 mosfets back in..turn the power on and got a Vy reading at 024..
When the set powered up I have a screen showing snow and now I have the "no signal" message floating around the screen!

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Hmm, is the NO SIGNAL clear and OK, or is it very distorted, barely visible?

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

No, it is clear and very readable...
It also had the message in the upper right corner of "video" and then it goes off and the "no signal" then pops up and starts floating around the screen...all the messages are very clear

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

oh...while the "video" was on the was a darker band the same width of the video message that ran from top to bottom of the screen.

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Sounds like there's still a problem - try giving it an actual video source...

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Put a antenna on it and programmed the channels..turned it to a local HD channel and got a good picture and sound...you can see what looks like faint red snow in the picture..like red sparkle is the only way I can describe it..it doesn't over ride the picture but you can see it...does that my description may any sense?

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

Yes that's a common fault with LG plasmas. The control board needs to be reflashed with corrected firmware. There's a guy on here (capkid) doing the repairs for about $30.

I'd make sure to replace the missing MOSFET before running it too long.

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

I'm still not sure what to make of your -Vy voltage. With a very low -Vy I'd expect a lot of picture issues. I'm guessing that you are making a measurement error with that - perhaps your meter is in error? Maybe try using 200V range.

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

Ok...checking at the 200v range I get a reading of 16.7 to 17.00
Along with the faint red snow the picture will sort of flicker like the brightness is jumping..its not bold just sort of faint

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

At 1000 the reading is 16...

[tom66]

Re: Insignia ns-42pdp (lg pdp42x30000)

I think the -Vy module needs to be repaired/replaced.
Can you remove it? I need good pictures, unfortunately...

[DaveL]

Re: Insignia ns-42pdp (lg pdp42x30000)

I'll try..give me a moment