PN42A400C2D issue

[CLANKIRKPATRICK]

I have a Samsung PN42A400c2d that was working fine and then one day I turned it on and the blue power indicator light blinks a few times and the stays lit with no picture whatsoever. I have gotten some conflicting advice on whether its a power board issue or a Y-main issue. Help!

[capkid]

Re: PN42A400C2D issue

Do you have sound? If you have a multimeter, check your power supply's VS and VA voltages (labeled "VS-TP" and "VA-TP").

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

No sound

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

And I dont have a multimeter

[tom66]

Re: PN42A400C2D issue

You will need a multimeter to diagnose almost every TV problem. One can be purchased for under $10 in Harbour Freight, or other DIY shops. Make sure it is a digital type multimeter, that is, it has a digital display, not an analog needle.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

What should I test when I get the Multimeter?

[tom66]

Re: PN42A400C2D issue

You can check the Vs, Va voltages, as well as the PS-ON and VS-ON signals. If you provide clear pictures we can show you how to do this.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

Here are the pictures, sorry for the delay.

[tom66]

Re: PN42A400C2D issue

Do you have your meter?

Set it to the DC 600V or 1000V range. This is marked with "=". It is NOT the one marked "~".

At the top of this image
https://www.badcaps.net/forum/attach...1&d=1378642444

there is a point marked VS_TP. Your red probe goes on there.

The black probe touches some part of the metal frame such as the wall mount bracket.

Then, the TV is turned on (you can touch Vs TP after turning TV on, but do not touch any other part while it is on.)

You should get a Vs of 207V within 2 volts.

Then switch to the Va TP. You should get 54V.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

I got 208 and 54

[tom66]

Re: PN42A400C2D issue

And those stay steady, they do not drop out?

OK, next step, follow these instructions:
https://www.badcaps.net/forum/showpo...61&postcount=2

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

So I have to solder a connection? I have literally never done that before.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

The numbers do stay steady also.

[tom66]

Re: PN42A400C2D issue

Nope, you just have to take a jumper pin block, like what you'd find on a hard disk drive, or a piece of carefully bent wire, and place it across pins 3 and 4.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

Ok, so what am I looking for when I do this, the link didn't say. Also, can I assume 3 and 4 are the bottom two? Last, can the bent wire touch the board itself or does it need to only touch 3 and 4, because mine has the pads? Sorry for all the questions!

[tom66]

Re: PN42A400C2D issue

1-2-3-4 are labelled. Use the labels.
Test pattern sequence should appear on panel
http://www.youtube.com/watch?v=JCtF5...9BzGSA&index=2

Does yours have no connection block? I can clearly see one in the photo. CN2007?

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

Ok I did that, and it still did the same thing, blue power light flashes a couple times and the stays lit with no picture...I did notice on the control board that when I turn it on led 2 flashes continuously and led 1 flashes once and the goes out.

Also I noticed on the plasma troubleshooting thread about disconnecting the z board and then the y board and seeing if the sound returns. Should I try that, or do you have something else?

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

I have sound with the Z board (the one on the right) disconnected...does that solve the problem or should I investigate more?

[tom66]

Re: PN42A400C2D issue

Try with "Z" (X-main on this model) connected again. If Vs/Va are present then it shouldn't be shutting down sound too. Wait 5 minutes after power removed before reconnecting due to high voltage.

[CLANKIRKPATRICK]

Re: PN42A400C2D issue

No sound when it is connected