Samsung PN59D6500 2011 board questions

[davep911]

If Vsc should be -197 is -208 bad and where can I check Ve?

What makes the buzzing noise on these tv's?
Just replaced SMPS, Mainboard, X and Y-Main with supposedly new parts from a tv with cracked glass and the buzz is much louder than before.

What are the temps I should be seeing on the hotter areas of these?
Using an infrared thermometer some parts are 130-140deg. F on the Dynamic picture setting.

Can damaged boards cause damage to other boards?
I want to swap some boards out to test them, is this a bad idea.

I just read this tv shares it's parts with these models: PN64D7000, PN59D7000, PN51D7000, PN51D8000, PS59D550, PN51D, PN59D and PS51D, PS59D.

[tom66]

Re: Samsung PN59D6500 2011 board questions

Buzzing noise comes from two places, the main SMPS transformer for the Vs, and the sustain board ER inductors. Sometimes dried up varnish causes it. I've also had loose screws on the sustain boards and case of the TV cause this fault.

-Vsc that high might cause a higher black level, but should not cause any harm. Ve is on the X-main sometimes marked Vb.

[selldoor]

Re: Samsung PN59D6500 2011 board questions

Perhaps Tom will correct me if I am wrong but I think I have read that cracked glass on a plasma can cause damage to boards.

[tom66]

Re: Samsung PN59D6500 2011 board questions

Yes it can in particular the Y-buffer board - usually the Y-main and X-main survive - so I would not use the Y-buffer board in the cracked set.

[davep911]

Re: Samsung PN59D6500 2011 board questions

-Vsc that high might cause a higher black level, but should not cause any harm. Ve is on the X-main sometimes marked Vb.

When you say higher black level you mean more light = brighter, or more black = darker?

The buzzing is so loud I'm thinking about buying yet another Y-main.

I got the boards from an unused tv with a cracked screen and because the guy turned on the tv to "test" it the Y buffers are bad. So if I try to fix a board and put it on the tv to test it I don't have to worry about it causing more damage?

[tom66]

Re: Samsung PN59D6500 2011 board questions

Where is the buzzing coming from precisely? Try locating it with a toilet-roll tube. My Kuro buzzes - mostly from the transformer on the SMPS.

[davep911]

Re: Samsung PN59D6500 2011 board questions

Probably the ER inductor. cardboard tube is a good tip, I will try it when I get home. I was thinking about using a 1/16" peice of aluminum tube to see if I could feel the vibration but I like your idea better.

Any thoughts on my other 2 questions? And thanks for your time by the way.

[davep911]

Re: Samsung PN59D6500 2011 board questions

Definitaly the ER inductor, used a paper towel tube to isolate it. I can hear it 20 feet away with volume at normal level. Is there anyway to reduce it?

[tom66]

Re: Samsung PN59D6500 2011 board questions

Can you supply a photo of the ER inductor on your board?

[davep911]

Re: Samsung PN59D6500 2011 board questions

Maybe I can swap the 1 off my old Y-main.

[tom66]

Re: Samsung PN59D6500 2011 board questions

That is not the ER inductor, it is the Y-Main voltage transformer which generates -Vsc, Vsch and FG15V.

[davep911]

Re: Samsung PN59D6500 2011 board questions

Ok, got that pic from another site where someone is giving bad info. You didn't mention this part before, is it ok for the Y-Main voltage transformer to buzz this loud? Can I swap it with my old 1?

[davep911]

Re: Samsung PN59D6500 2011 board questions

Are all the tv settings on the main board? Will removing the main board erase all the settings?

[tom66]

Re: Samsung PN59D6500 2011 board questions

Virtually all of them are, and yes.