Insignia ns-42pdp no power

[TimT]

I have a Insignia ns-42pdp power LED comes on red then when i turn on the TV the led is blue. there is a buzzing for one of the caps for about 3 seconds the TV turns off..any suggestions? should I replace the cap? or could something else be causing the cap to buzz..

[TimT]

Re: Insignia ns-42pdp no power

also there is a red LED light on power board. when I turn Tv on and hear the buzz from the cap the blue light changes to red on front of Tv and the LED on power board lights up. I assume this means there is a problem on power board. LED is marked LED601

[tom66]

Re: Insignia ns-42pdp no power

Unplug the two large connectors on the top left of the board then power it up again. See if it stays on.

[TimT]

Re: Insignia ns-42pdp no power

with both unplugged the Tv stays on! I tested pin 5vctr at 5.2v if I plug in x601 connector then Tv goes to standby and red led lights up. but if i just plug in connector X602 the Tv stays on and I get a picture on half the screen. X601 run over to the right side of tv.. I guess it controls the backlight and the other half of screen?

[tom66]

Re: Insignia ns-42pdp no power

You have a bad Z-sustain, I suspect.
https://www.youtube.com/watch?v=Y8MNQYXw8E0

A plasma panel doesn't have a backlight. It works entirely differently from an LCD. Each pixel independently emits its own light compared to an LCD which uses a uniform light source and blocks/allows through out the light at the pixel level.

[TimT]

Re: Insignia ns-42pdp no power

this is the board that if connected will cause tv not to work.

[tom66]

Re: Insignia ns-42pdp no power

Yeah. That's the Z-sustain. Picture now looks purple, or dim, and/or slow to update, with that board removed?

[TimT]

Re: Insignia ns-42pdp no power

one half is very slow to update. the other half is not working... looks like alot of trouble to fix

[tom66]

Re: Insignia ns-42pdp no power

Remove the leftmost fuse from this image.
You should still have a dim/blur/ghosty picture but all of it should work now.
https://www.badcaps.net/forum/attach...0&d=1353864469

[TimT]

Re: Insignia ns-42pdp no power

yes it works but it very slow refresh rate.. so I need to replace the Z sustain?

[tom66]

Re: Insignia ns-42pdp no power

Yes, or do the repair in the video if you have the equipment. If you can remove it, soldering a new one on is easy. But not everyone can as it takes a lot of heat.

[tom66]

Re: Insignia ns-42pdp no power

Note you only need to replace the Z-sustain, the Y-sustain is fine for now.

[TimT]

Re: Insignia ns-42pdp no power

is that a part that digikey would have? thank you!

[tom66]

Re: Insignia ns-42pdp no power

Unfortunately not.

[TimT]

Re: Insignia ns-42pdp no power

I picked up a used sustain board from a television repair shop in town! and I'm happy to say that what's the problem. however I did notice that when the screen is black there are red speckles.. they only show up when there's a black screen other than that works fine. from what I read the voltage needs turn down?

[tom66]

Re: Insignia ns-42pdp no power

It looks like LG plasma tech... Red sparklies can mean control board needs new firmware but sometimes you can get lucky.

Post a picture of the Y-sustain and power supply so I can highlight the adjustments.

[TimT]

Re: Insignia ns-42pdp no power

there seems to be some ajustment " knobs " on both boards..

[tom66]

Re: Insignia ns-42pdp no power

OK, first you want to drop Vs slightly.
With the TV running, slowly adjust Vs and measure it with a multimeter. Drop it by about 5V.

If the sparklies do not go away, try "setdn" adjustment -- tweak one way, if it gets worse, go the other way.

[TimT]

Re: Insignia ns-42pdp no power

that did the trick! thanks you!" learning something everyday :-)

[tom66]

Re: Insignia ns-42pdp no power

What did you end up adjusting in the end?