Problem with Samsung Plasma PS43D450

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

only Vs and Va on PSU tom.

[tom66]

Re: Problem with Samsung Plasma PS43D450

Ve is on X-main.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

these are the only ones on the Xmain Tom :

[tom66]

Re: Problem with Samsung Plasma PS43D450

There are two jumpers marked VE at the top of the X-main board. Test one of those.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

tested both VE jumpers Tom and only returning 94v ?

[tom66]

Re: Problem with Samsung Plasma PS43D450

That is fine. So, -Vsc, Ve, Vs is OK, what does Va test at? It could be a bad control board or X-/Y-main board. Hard to tell without a scope on the boards.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

deffo VE Tom. took picture of what i was testing and also what board it was on.

[tom66]

Re: Problem with Samsung Plasma PS43D450

I know Ve is fine. 94V is OK for this generation of plasma panel. I want you to test VA.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

VA on PSU was testing 57v tested jumper with circle.

[tom66]

Re: Problem with Samsung Plasma PS43D450

So, I don't have any immediate suggestions without a test using an oscilloscope.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

so bummed out on this one. would it be worth chucking into a TV repair shop ? only paid £20 for the tv.

[tom66]

Re: Problem with Samsung Plasma PS43D450

A TV repair shop will probably tell you bad panel (which is wrong - the only two ways a plasma panel goes bad is a stuck line on the screen, or a crack in the panel), or charge too much to be worth it.

Consider investing in a cheap scope. I sold my old 20MHz scope on eBay for about £35 delivered and there are plenty of others out there. Used that for all my plasma repairs, before I upgraded to the Rigol.

Scope just needs to be 20MHz or more, with a 10X probe (can be purchased later) and 300Vpk input or more. Analog CRT. Don't bother with a toy scope, such as a DSO Nano - not worth it.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

even if i purchased the oscilloscope i know i would have no clue how to work it out, seems like a lot of functions and dials on them.

[martino]

Re: Problem with Samsung Plasma PS43D450

even if i purchased the oscilloscope i know i would have no clue how to work it out, seems like a lot of functions and dials on them.

I'm sure Tom will talk you through how to set it up....

[tom66]

Re: Problem with Samsung Plasma PS43D450

I'm willing to help you in using one, but fundamentally they're pretty simple devices. The volt scale is like setting the range on a multimeter. A scope just shows you a reading in time, as well as in volts. So you can see what a voltage does over time, which is vital because a plasma display works on a waveform that changes thousands of times per second. Then there is a trigger setting, which helps keep the scope synchronised and keeps the display stable - that's just a voltage setting - if the scope sees a rising voltage or falling voltage of that level, it'll sync onto it. Most of the other stuff can be ignored for simple tests. When I am fiddling with a scope, I am 99% of the time changing volts/div, time/div or trigger level. Everything else can be left in a standard setting.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

ok Tom thanks. is there any cheap oscilloscopes you reccomend and il buy on FleEBay tonight

[tom66]

Re: Problem with Samsung Plasma PS43D450

Bed time for me, just browse for now.

You need a dual channel one, CRT analog (the old green/cyan tube ones.) It needs to be 20MHz or higher bandwidth. Aside from that, almost anything else is an added extra. If it comes with switchable 10X probes it'll save you from buying them.

I'd recommend picking one up, but if shipped well they're fine. The tube can be delicate, subject to breakage etc.

If you're unsure, post a link before buying.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

Tom what i also noticed is i seen your video on the same tv with clicking / no power, when your tv switched on the green light on the control board stayed on however the one on mine repeatedly flashes no matter how long its left on

should it be doing this ?

[tom66]

Re: Problem with Samsung Plasma PS43D450

Repeated flashing every 1~2sec indicates a working control board.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

ok so got this hooked up to a oscilloscope from someone i know that owns one. he said it was most likely problem with Ymain so ordered a new one fron Fleebay and arrived today, tv working as new now. thanks for the help on this one.