Problem with Samsung ps43d490 PDP

[Taterbug]

Re: Problem with Samsung ps43d490 PDP

Which boards have you already replaced?

[Brentsky]

Re: Problem with Samsung ps43d490 PDP

Which boards have you already replaced?

I had replaced X-sus 3 times and Y-sus once and Y-buffer as u suggested. it turns out that all the X-sus boards received from ebay were all DOA's I got a working X-sus board and the Tv is working. now the problem is when I try to upgrade the Firmware it's telling me it can;t find a valid image file. and I got the file from samsungs site and follwed it's instructions to a t. it see's the usb thumb drive so I know that's working. Does anyone here have a pn43d490 they have updated that can tell me what there FW virsion says or take a photo of it even. I'm wondering if it's because the Firmware was updated prior to z-sus failing especially being that the z-sus didn;t fail in the standard spots or my rebuild should have been fine.

[tom66]

Re: Problem with Samsung ps43d490 PDP

Make sure your USB drive uses FAT format.

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

I have similar problems with a ps43d450a2wxxu. There is sound and some times the screen comes on for a bit then goes off, other times it won't come on.

If I have all boards plugged in, y&x buzz (x more) and va is 58 and vs is 208. The green light in the logic board flashes every second. If I unplug x main, it comes on for 5 seconds and off for 2, and the boards stop buzzing. Also, with either x, y or both unplugged from the psu, the voltage drops from 58 and 208 down to zero over a few seconds.

I cannot see any bulging caps but that doesn't always mean they are fine.

[tom66]

Re: Problem with Samsung ps43d490 PDP

Sounds possibly like a main board issue... So occasionally, the TV -does- work?

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

Yes, I turn it on and the screen comes on. It lest you watch for a bit then goes off and doesn't come back on for a while. It's worse on he channels. Sometimes only lasts for a few minutes. I had similar on my other lg and replaced the capacitors on the main board and it's been fine since (those weren't domed) but this one doesn't have any on its main board...

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

Just watched about 5 mins of a hd film on hdmi then screen went black but sound still there. Turned tv off and on again, sound comes back but screen doesn't. Are there any caps that could affect this before I replace the board?

[tom66]

Re: Problem with Samsung ps43d490 PDP

When the screen goes black, does the minimum luminescence (low "black glow") continue to be visible, or does that go too?

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

I have just tried to turn it on and the screen won't come on at all now. When I give power from the wall, the standby light is on. When I press the power light on the remote, the red light flashes on and off every second but the screen stays off, no luminance / glow at all from the tv?

[tom66]

Re: Problem with Samsung ps43d490 PDP

OK, time to take the cover off your TV and get some nice clear pictures of the boards in your set.

I ask for the boards in your set because Samsung changed the design of this TV mid way through production so your TV could have one set of boards or another.

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

I watched a video on YouTube about this model shutting down, for him it ended up being bad solder joints on the 42dh ym so I took it off, re soldered most of the joints, put it back in ant it is working at the minute. I refined the voltages using the pots, now I'm just waiting to see if it goes off, while having a go on the ps3 hope the picture uploads properly

The heatsinks on the transistors get red hot though, don't know if that normal

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

Just for info, before I just did this, voltages were round 207 and 58 on standby, as soon at I took it out of standby, the voltages dropped slowly and the screen didn't come on. I have also updated the firmware now the screen is working a bit In case there was an issue there

[tom66]

Re: Problem with Samsung ps43d490 PDP

Could you link us to this video...?

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

http://youtu.be/PC1Fo1Huipg

[tom66]

Re: Problem with Samsung ps43d490 PDP

Useful video, thanks. Hope it works for you. Never heard of this problem before.

[guy_hall]

Re: Problem with Samsung ps43d490 PDP

It seems to have worked, I have given it about 5 hrs of testing and had no issues compared to 10mins max before but time will tell. It's certainly done something and hopefully it helps someone else too.

[Sabenhaz]

Re: Problem with Samsung ps43d490 PDP

Hi all
Hoping someone can help. Have been messing around with this telly and replaced most parts
Clicking 5 times then nothing. Lastly replaced the x board and now thats stopped the clicking but only have half the picture...The right side as you look at it...Any ideas
Cheers
Sabenhaz

[tom66]

Re: Problem with Samsung ps43d490 PDP

Could you share a picture of the exact fault?

[Sabenhaz]

Re: Problem with Samsung ps43d490 PDP

Ok scratch that last message. Silly me left the connector between the bottom two buffers disconnected
Anyway now I have a fine black line going from left to right all the way across the screen. About two thirds the way down...Any suggestions?
Cheers
Sab

[tom66]

Re: Problem with Samsung ps43d490 PDP

Did you plug that cable in while the set was running or shortly afterwards...
You probably just fried the plasma panel if so. (Sorry!)