samnsung plasma pn51f5350afxza / cracked panel

[tucocaps]

I've actually got a few of these. Different model samsung plasmas. They all have the damaged screens, and all seem to just buzz when plugged in. I also see the mainboard optical out light up, but that's about it. I don't even think there is a power or standby led, and none actually seem to power on. I think that's all due to the busted up screens. It seems that the Samsung plasmas with broken screen do not "error out" with a flashing power LED, as do Panasonic?

I know you guys have helped me in the past with similar situations with panasonic plasmas, but I'm not sure if there is any way to isolate good boards on samsung plasmas such as this? Thanks for any information.

[tom66]

Re: samnsung plasma pn51f5350afxza / cracked panel

The Y buffers are basically guaranteed to be dead. The other boards may be OK. The buzzing you hear is the sustain boards trying to get the panel to light up so something is working.

[ReeceyBurger123]

Re: samnsung plasma pn51f5350afxza / cracked panel

The loud buzz is because the sustain boards are tying to fire on the panel however due to it being cracked the X and Y electrodes in the PDP have probably shorted out meaning that it wont light at all. This also means that the Y buffers have been killed by the bad panel probably due to taking too much current due to it being shorted but everything els should be ok.

[tucocaps]

Re: samnsung plasma pn51f5350afxza / cracked panel

Thanks! I was just confused about it all, because I remember a "blink code" on panasonics from a cracked panel. Then, one one of the sets, I think I wound up setting a jumper on the SC board, and the set would then power on, but with the buzzing sound. I think the idea was if you got that far you could be pretty sure that the boards other than buffers were OK. I guess it's different with Samsung, as they just seem to buzz and no power on light. At least as far as I can tell.

[tucocaps]

Re: samnsung plasma pn51f5350afxza / cracked panel

Actually, I noticed after a few plugs/unplugs, with the set upright, the set did seem to stop buzzing and go to a flash code error. Either two or three slow blinks.

[ReeceyBurger123]

Re: samnsung plasma pn51f5350afxza / cracked panel

Strange lol maybe flexing the panel.

[tucocaps]

Re: samnsung plasma pn51f5350afxza / cracked panel

Well, that power led is pretty small when hunting it upside down on the bench. I think it may have been blinking all along. Sometimes it does 5 , then no more. Mostly it seems to do 2 blinks. The blinks have fairly long pauses, which are different than the panasonic blinks I'm more used to seeing.

After pulling the cover, I see the led on the mainboard is doing a slow flash, and that's all it seems to do the entire time it's plugged in. Is this any kind of indicator on the health of the mainboard? I've noticed that mainboard led documentation is hard to find in service manuals.

[tucocaps]

Re: samnsung plasma pn51f5350afxza / cracked panel

I had another question about cracked PDP. Can it also short out or otherwise break the X buffer?

[ReeceyBurger123]

Re: samnsung plasma pn51f5350afxza / cracked panel

The X buffer normally is bonded to the screen so you dont have to worry about that but probably has killed it as well.

[tucocaps]

Re: samnsung plasma pn51f5350afxza / cracked panel

Thanks Reece. I'm still wondering about that mainboard LED for future reference. I remember on some Sharp LCD's I was working on , that a green flash while on was "normal". I'm assuming that all varies from board to board?

[ReeceyBurger123]

Re: samnsung plasma pn51f5350afxza / cracked panel

No problem mate
For the led it does vary from brand to brand unfortunately.