Samsung PS43D450A2WXXU power on fault

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

100 ohm to ground? It still clicks? Try with both Y-Main and X-Main unplugged.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

Voltage @ PSON 0.21v
with both x & y out clicks on, but used to do this before

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

That's good it should be turning on.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

There is a whinnying noise coming from the power supply, presume its the transformers, changes pitch when the LED switches on & off

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

I am suspecting somehow both X and Y are dead, shorted. Test the resistance across Vs and GND for both boards. Expecting >500 ohms.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

Vs to Grnd on Y-Main is all over the place over 20M then going down then up again
Vs to Gnd on X-Main is 0.04

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

So X-Main is dead, Y-Main is possibly OK but you say without X-Main, TV still clicks?

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

with just Y-Main connected PSU clicks once, if everything but the X-Main was reconnected would I expect to see anything on the panel?

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

Yes I'd expect a dimly lit picture, possibly with distortion. Like this.
http://www.youtube.com/watch?v=Bmu12mCOKcU

(my video.)

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

ok I notice that you get the samsung sound when powering on?off, I dont have this.
When I press anything on the remote the signal is getting to the infra red receiver because the LED is flashing just nothing happens.
No picture of any kind.

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

Check in a dark room, may be very slight glow.
The design on this model may be different, you may not see any glow, but most plasma displays glow slightly and have purple picture with bad X-Main/Z-Sustain.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

Ok darkened the room plug in, one click then flash of a few white lines then back to black. It can't be anything to do with the Y-buffers can it?

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

I've had no experience with this chassis & am aware Samsung have changed the design of their plasmas. It may be normal. I would advise you to swap X-Main (usually very cheap, around £20 for most), then see if it works. If not, we can have a closer look at the Y-Buffer and Y-Main.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

ok thanx Tom will do Nice to put a face to who I'm talking to

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

Got ahold of friend's plasma (also PS43D450) and diagnosed the fault as being the Y-Main. Buffers and X-Main both appear OK, as does plasma panel.

However his just clicks on and off, no power whatsoever.

New Y-Main is £14, so I've just ordered that, not worth troubleshooting too far if it's that cheap!

Amazing just three transistors on a heatsink on Y-Main and just two on the X-Main! Everything else SMD. Probably why it failed... running too hot.

[jgrimshaw01]

Re: Samsung PS43D450A2WXXU power on fault

Hi Tom
Just to let you know received replacement X-Main today put it in worked
Thanks for all your help my mother in law loves me now

[tom66]

Re: Samsung PS43D450A2WXXU power on fault

Great! Enjoy the TV.

[latics33]

Re: Samsung PS43D450A2WXXU power on fault

Hi All, First post on here so please bear with me.
I have a Samsung PS43D450A2W that is 2 years old. Has the same problem as posted here - when try to power on the set clicks a few times, LED flashes and then....nothing.
I've been advised by a local TV repairer that it is most probably be the Z board. Now, I'm no TV expert so don't even have a multimeter, but I'm looking to try to repair this myself, but not sure:
- which is the Z board?
- where I would get a cheap one from (Ebay I'm guessing but what would I search for i.e. part number, is it technically the ZSUS, Z-main??)
- could I fit this myself?
Been quoted over £100 to fix, hence my attempt to do it on the cheap.

[capkid]

Re: Samsung PS43D450A2WXXU power on fault

Hi All, First post on here so please bear with me.
I have a Samsung PS43D450A2W that is 2 years old. Has the same problem as posted here - when try to power on the set clicks a few times, LED flashes and then....nothing.
I've been advised by a local TV repairer that it is most probably be the Z board. Now, I'm no TV expert so don't even have a multimeter, but I'm looking to try to repair this myself, but not sure:
- which is the Z board?
- where I would get a cheap one from (Ebay I'm guessing but what would I search for i.e. part number, is it technically the ZSUS, Z-main??)
- could I fit this myself?
Been quoted over £100 to fix, hence my attempt to do it on the cheap.

If you look at the first picture in the first post, the Z-Sus, or X-main as Samsung calls it, is the tan-colored board on the far right that connects to the panel. If it is faulty, you can replace it yourself. ShopJimmy.com is my favorite place to buy these, but you can also find them on eBay. Use caution when buying on eBay.

You can take the repair man at his word, but there's also a chance that the Y-main, which is the tan-colored board on the far left that's connected to the long vertical board, could also be damaged. You can try the less scientific approach to testing, which could also cause further damage, or you can buy a meter and do a test:

(1) Less scientific test:

(A) With the TV unplugged, disconnect Y-Main connector from the power supply (PSU). Plug in TV then turn on. If TV powers up, suspect Y-Main or X-Main. Proceed to next step.

(B) Unplug TV then wait about 5 mins for the PSU to discharge.

(C) Disconnect Y-Main-to-X-Main connector then connect Y-main to PSU. Plug in TV then turn on. If TV powers up, suspect X-main and STOP TESTING! Otherwise, Y-main is faulty. X-main may also be faulty, since they're chained.

(2) Here's a more scientific approach: https://www.badcaps.net/forum/showpo...74&postcount=5

[predseda]

Re: Samsung PS43D450A2WXXU power on fault

Hi Guys,

I recently repaired my PS43D450A2WXXU where I suspected that the Y-Main is faulty. Just to make sure I also ordered X-Main. After I replaced the Y-Main TV started to work however when I was watching the TV I have noticed this shivering redish/greenish maps showing up on the screen from time to time. It is especially noticable when the picture is purely white. As it is mainly happening on the side of the screen where there is X-Main I tried to replaced it as I had a spare part for it, but it didn't help. Any idea what can be wrong? Is it the display or do I need to replace also power supply or signal board?

Thanks.