My first plasma, RCA 42PA30RQ - Sound but no picture

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

gEDA gschem - more or less Linux only.
I use Cadence Allegro at work, and Eagle/gEDA at university.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

I'm going to look into that. I have my laptop set up as dual boot Windows 8.1/Ubuntu 12.04. I don't know Linux very well but am learning.

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Try opening attached *.sch if you like. (Rename *.txt to *.sch as forum won't let me upload a *.sch)

From terminal:

sudo apt-get install gschem

will install gschem

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Nope, I need an app that can open it.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Oh, it's Linux. OK, I'll try this afternoon. I have to take some stuff to the post office and take care of a few things. I'll get back to the board this afternoon as well. Again, thanks.

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

?
Just open the terminal and type "sudo apt-get install gschem" no quotes.
Then after it has installed, "gschem <filename>" will open it or you can double click any *.sch file.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

I tried to open it in windows.

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Oh OK I think someone compiled an old gEDA for Windows but it's not maintained any more so I doubt it will work.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

I actually love Linux. It just takes me a while to figure out how to do stuff. Once I get it figured out though, I'm good.

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

I use it everyday for nonprofessional engineering, sadly Cadence not made for Linux so can't use that. Still using XP on work PC, crazy.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

I liked XP way better than this 8.0, 8.1 version. All they've managed to do is make the simplest tasks complicated. User friendliness went right out the window.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Can't seem to find the one marked 5K. If it's the HN4B101J nobody has it. Is it possible to substitute it?

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Try opening attached *.sch if you like. (Rename *.txt to *.sch as forum won't let me upload a *.sch)

From terminal:

sudo apt-get install gschem

will install gschem

That didn't work. Googled it and I figured it out. It's

sudo apt-get install geda

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Been a long time; using same Linux PC for over 3 years (still stable...)

[tw2005]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Can't seem to find the one marked 5K. If it's the HN4B101J nobody has it. Is it possible to substitute it?

looks to be a tough one. Doubt you can get just one from here.

http://www.vyrian.com/search.php?sea...%29+&x=38&y=12

RS Components had them but just says backorder but a lot of the time it means out of production or they just won't be stocking these.

Allied Electronics don't(RS USA)

May have to try these guys http://www.utsource.net/ic-datasheet...F-4501788.html

2-3weeks usually from china

[tw2005]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

In case you bail out of this, this is cheap but as you'd know always a risk of getting DOA.

http://www.ebay.com.au/itm/XSUS-Boar...item20df9c1753

Ymain , Xmain , buffer same seller 100%. Picture is wrong for the buffer but description and numbers correct.

http://www.ebay.com.au/itm/Samsung-B...item3cd0821b47

http://www.ebay.com.au/itm/Samsung-B...item3cd2eb2c03

http://www.ebay.com.au/itm/Samsung-L...item3a866b610b

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

A few sellers on Alibaba have them listed, I'm waiting on a reply. How would I test the one I have? The one marked 46 tested ok.

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Can't believe I've had this TV for 2 months waiting on parts. Well, I rebuilt the x-main and it fried right away. So something is wrong with the Y-main too. So I put it aside for a while because I haven't had time lately. Yesterday, out the blue, someone contacts me and has a Samsung PN42C450B1D with a broken screen. They only want $15 and will bring it to me. So I look on Ebay to see what the parts are worth and realize that it has the same parts as this RCA. So I get the TV. My plan now is to take the panel from the RCA and put it in the Samsung. I figure it will be worth more this way. Before doing so, I decide to test it with the RCA parts. I replace the x and y mains in the RCA with the ones from the Samsung. I get 1click and it stays powered on, but no picture. I turn it off, kill the lights, power back on. I see a few flickers. I figure it's the Y buffer. So I replace that with the one from the Samsung. Power on, and I get smoke and a hole burns through one of the r2a20292bft chips. Upon closer inspection it appears that there is a hole in two of them. I have a mosfet that appears shorted, I removed it and still have a short between the pads. I remove both of the r2a20292bft chips and the shorted pads aren't shorted any more. Does it sound like I can just replace the two r2a20292bft ICs and the MOSFET? Or should I replace all 8 r2a20292bft ICs?

[lookimback]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

Here's some pictures.

[tom66]

Re: My first plasma, RCA 42PA30RQ - Sound but no picture

KA78=not a FET, it's a 7805 regulator.

Having a short between the pads is odd, could indicate more ICs are bad (floating 5V or such...) Need exact pinout of the IC to confirm.

If possible I would use the RCA buffer as these Samsung panels are well known to eat the buffer board if the screen is smashed and it's powered on with a smashed screen.