Samsung PN42C430 Plasma no picture please HELP

[1997eclipsegst]

Re: Samsung PN42C430 Plasma no picture please HELP

You may have just received a defective board as a replacement.
I am not sure if anything else goes bad on these boards. I just replaced the 2 RJH30E2 components on the 3 boards I have and when I tested VS to ground it no longer reads shorted. I haven't had a chance to test them in a tv though.

Double check the RGP30E2 on your Y-Main. All 3 were shorted on mine as well. Also check you Y-buffer as well. I had issues with multiple boards in my set that gave me the multiple clicks when turning on.
Here is a video Tom66 made about testing buffers:http://www.youtube.com/watch?v=51SZsfH60EY

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

This may be helpful: https://www.badcaps.net/forum/showpo...74&postcount=5

I would not waste time trying to replace the RJH30E2 transistors or any other transistors/components on the heat sink, since you most likely have shorted SMT components on the backside of the board that killed them; trust me...I've been there and done that. You can get into a infinite loop very quickly on these Samsungs. One month is WAY too long to be working on this TV. At this point, you may be looking at replacing the Y-main, Y-buffer, and X-main. Of course, testing will confirm.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

You may have just received a defective board as a replacement.
I am not sure if anything else goes bad on these boards. I just replaced the 2 RJH30E2 components on the 3 boards I have and when I tested VS to ground it no longer reads shorted. I haven't had a chance to test them in a tv though.

Double check the RGP30E2 on your Y-Main. All 3 were shorted on mine as well. Also check you Y-buffer as well. I had issues with multiple boards in my set that gave me the multiple clicks when turning on.
Here is a video Tom66 made about testing buffers:http://www.youtube.com/watch?v=51SZsfH60EY

Ok will do, what are those 2 components that failed on my X-Main called? just going to call an electronics supplier to see if they have them.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

This may be helpful: https://www.badcaps.net/forum/showpo...74&postcount=5

I would not waste time trying to replace the RJH30E2 transistors or any other transistors/components on the heat sink, since you most likely have shorted SMT components on the backside of the board that killed them; trust me...I've been there and done that. You can get into a infinite loop very quickly on these Samsungs. One month is WAY too long to be working on this TV. At this point, you may be looking at replacing the Y-main, Y-buffer, and X-main. Of course, testing will confirm.

Oh ok I understand, but I have already replaced the Y-Main, Y-Bufffer and just replaced the X-Main, but I guess I got a bad one from ebay.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Oh ok I understand, but I have already replaced the Y-Main, Y-Bufffer and just replaced the X-Main, but I guess I got a bad one from ebay.

Your Y-main may have been damaged by the faulty X-main; the part you got on eBay was probably fine...before it was installed in your TV. It probably got damaged by the Y-main, which was probably damaged by your original X-main. It can become an infinite loop. Trust me, you need to be very careful when testing these particular TVs. I'd do most of the testing with a meter and skip the voltage tests in relation to the mains. I'd only test the power supply with none of the mains connected to it.

Edit: Again, you may be looking at replacing the Y-main, Y-buffer, and X-main ALL AT ONCE again to get it working.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Your Y-main may have been damaged by the faulty X-main; the part you got on eBay was probably fine...before it was installed in your TV. Trust me, you need to be very careful when testing these particular TVs. I'd do most of the testing with a meter and skip the voltage tests. I'd only test the power supply with none of the mains connected to it.

No, your not understanding, I ordered a new Y-Main and a new Y-Buffer from shop jimmy as a set, and I put them in and the TV would power up and stay on, without the X-Main connected, with the old parts it would not stay on even with the X-Main disconnected, but now with the new ones it does, but as soon as I plug the X-main it wont power on. got a new x-main from ebay, and it still wont power on

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Hmm, interesting. I know Tom was helping you, and I don't want to muddy this thread if what I mentioned is not applicable to your situation. You mentioned that the newest X-main has shorted components, correct?

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Hmm, interesting. I know Tom was helping you, and I don't want to muddy this thread if what I mentioned is not applicable to your situation. You mentioned that the newest X-main has shorted components, correct?

That's correct, the same 2 transistors are shorted on the new one as my old one. Now I don't know if something in the set shorted it or if it was like that already

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

That's correct, the same 2 transistors are shorted on the new one as my old one. Now I don't know if something in the set shorted it or if it was like that already

Ok. Are your VS and VA voltages staying up with the Y-main connected to the PSU (without the X-main)?

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Ok. Are your VS and VA voltages staying up with the Y-main connected to the PSU (without the X-main)?

Nope they are not.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Nope they are not.

So, like I mentioned, it looks like your Y-main, Y-buffer, and X-main need to be replaced all at once to get this working. I'd pull the Y-main and check for shorts; I'll bet you have shorts. I went through this on one of my first Samsung thin-profile TVs - very frustrating. The boards keep killing each other until you finally put good boards in all at once. If when you first open one of these TVs and discover that, for example, ONLY the X-main is bad, you can just replace the X-main. Once you get deep into testing and start blowing boards, it's a pain in the neck. That's why I advocate not connecting these up to the power supply and doing most of your testing out of the TV.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

So, like I mentioned, it looks like your Y-main, Y-buffer, and X-main need to be replaced all at once to get this working. I'd pull the Y-main and check for shorts; I'll bet you have shorts. I went through this on one of my first Samsung thin-profile TVs - very frustrating. The boards keep killing each other until you finally put good boards in all at once. If when you first open one of these TVs and discover that, for example, ONLY the X-main is bad, you can just replace the X-main. Once you get deep into testing and start blowing boards, it's a pain in the neck. That's why I advocate not connecting these up to the power supply and doing most of your testing out of the TV.

I took the Y-Main out just now and did a VSS to ground test and the meter just says OL no beeps or anything

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

I took the Y-Main out just now and did a VSS to ground test and the meter just says OL no beeps or anything

Try testing the components on the heat sink. There are probably a couple shorted.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Try testing the components on the heat sink. There are probably a couple shorted.

Nope nothing is shorted

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Nope nothing is shorted

Weird. Can you post readings?

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Weird. Can you post readings?

Well I don't know its really odd, because not all components give a reading most of them say OL if I flip the leads then it may give a reading on some and not on others, but it doesn't beep

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Well I don't know its really odd, because not all components give a reading most of them say OL if I flip the leads then it may give a reading on some and not on others, but it doesn't beep

OK. It would be nice to see those readings to make a determination. You're in diode mode, correct?

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

OK. It would be nice to see those readings to make a determination. You're in diode mode, correct?

yes its in diode mode. Ok im going to take the readings give me a few min. ill post back as soon as im done.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

OK. It would be nice to see those readings to make a determination. You're in diode mode, correct?

First 2 leg device

black on first leg red on second leg = 0.442

reverse the probes and all i get is OL no beeps
.......................................................................

Second 3 leg Device

red pin 1 with black on pin 2 = OL

red pin 2 with black on pin 3 = OL

red on pin 1 black on pin 3 = 2.069

black on pin 1 red on pin 2 = OL

black on pin 2 red on pin 3 = OL

black on pin 1 and red on pin 3 = 1.421

.............................................

3rd Device 3 legs

red on pin 1 black on pin 2 = OL

red on pin 2 black on pin 3 = OL

red on pin 1 black on pin 3 = 1.585

black on pin 1 red on pin 2 = OL

black on pin 2 red on pin 3 = OL

black on pin 1 red on pin 3 = 1.093

................................................

4th Device 2 legs

red on pin 1 black on pin 2 = OL

black on pin 1 red on pin 2 = 0.366

............................................

5th device 3 legs

red on pin 1 black on pin 2 = 1.773

red on pin 2 black on pin 3 = OL

red on pin 1 black on pin 3 = 1.556

black on pin 1 red on pin 2 = OL

black on pin 2 red on pin 3 = 0.365

black on pin 1 red on pin 3 = 1.070

.....................................................

6th device 3 legs

red on pin 1 black on pin 2 = OL

red on pin 2 black on pin 3 = OL

red on pin 1 black on pin 3 = 0.612

black on pin 1 red on pin 2 = OL

black on pin 2 red on pin 3 = OL

black on pin 1 red on pin 3 = 0.603
...........................................

7th Device 2 legs

red on pin 1 black on pin 2 = OL

black on pin 1 red on pin 2 = 0.440
............................................

8th device 3 legs

red on pin 1 black on pin 2 = 1.640

red on pin 2 black on pin 3 = OL

red on pin 1 black on pin 3 = 1.420

black on pin 1 red on pin 2 = OL

black on pin 2 red on pin 3 = 0.482

black on pin 1 red on pin 3 = 0.765

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

ok, one sec. I have the LJ41-08592 Y-main in front of me.