Samsung Plasma PN43D450 no response click, X-main

[Glitcher]

Have a PN43D450 Samsung plasma. Once plugged in it'll attempt to turn on but the relay clicks on and off twice.

The X-main is connected to the Y-main and Y-main is connected to the PSU.

Unplugging only the X-main (LJ92-01796A) (disconnected from the y-main.) The TV makes the chime with no picture. Unplugging the Y-main, the TV still makes the chime with no picture. So I'm guessing its a defective X-main board. Looking around ebay, there are some repair kits for some smd FETS and an IC underneath the X-main.

Does anyone know which FETs and IC is usually replaced on this LJ92-01796A X-main? It does note i should update firmware after repairs to prevent future failures so ill keep that in mind as well.

[AlbertaJason]

Re: Samsung Plasma PN43D450 no response click, X-main

your trouble sounds like mine...but i think the y main is the culprit in my case. look at the pics in my thread samsung pn50c490b3dxza power issue and see if its wired the same.

[Glitcher]

Re: Samsung Plasma PN43D450 no response click, X-main

Harvested some parts from the same model cracked screen panel, replaced the x-main board and the tv is working again!

Does anyone know how to update the firmware? I saw a thread with a youtube link but cant find it now.

[capkid]

Re: Samsung Plasma PN43D450 no response click, X-main

Nice. Yeah, it's best to replace the whole board in these newer Samsungs.

Edit: Is this your firmware? Instructions are included: http://www.samsung.com/us/support/ow...PN43D450A2DXZA

[Toddness87]

Re: Samsung Plasma PN43D450 no response click, X-main

I am having a similar problem with the turning off and clicking.

I opened it up and the capacitors don't look bad and when I unplug the power from the x main is makes the chimes but no picture, and when I unplug the power from the y main I also get a chime but no picture.

The capacitors look ok, no serious bulging or oozing, but could they be slightly bulged? Should I be able to feel it noticeably with my finger? I am at a loss.

[Toddness87]

Re: Samsung Plasma PN43D450 no response click, X-main

As a follow up, i've come to the conclusion that it most likely is the X Main, as process of elimination and seeing what still works with what plugged in has helped.