Samsung pn60e530a3f sound no picture

[johns1mj]

I followed a similar thread from back in January and did not get any results.
I bought a 60" plasma that would intermittently display the picture. It would always have sound. After a couple days it would no longer display at all. The logic board will flash every 5 seconds. I found two televisions with the same boards. I bought both television sets with cracked screens (cheap). I changed all the boards. Still no picture. Same result with the logic board. I changed the y main and buffers, x main and buffer, the power board and all the cables. from the 3rd set. Still no change. The ve and va voltages are good. If i unhook the ribbon to the y main the logic board flashes normally. Any advice on what next?

[Alastair E]

Re: Samsung pn60e530a3f sound no picture

Whats the Vs, VScan and -Vy voltages doing?

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

Va and VA are normal 211 and 57

[Hamie]

Re: Samsung pn60e530a3f sound no picture

Yeah but what's the vscan?

Test point located on the ysus.

Have you tried test patterns?

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

vsc and -vy test point I could not find. I tested at the connector but got a really low number and figured I was doing it wrong. The only way I got vs and va numbers was with the ribbon between the logic and y-main disconnected. If connected the tv goes into protect mode.

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

I would feel better about shorting out pins if I had a picture of what pins. I see lots of people talk about doing it but couldn't find a picture.

[Hamie]

Re: Samsung pn60e530a3f sound no picture

Ok upload a picture of your ysus and a picture of the control board (the one with the flashing green light)

[Hamie]

Re: Samsung pn60e530a3f sound no picture

Think I've located your ysus.

Here is the vscan test point.

[Hamie]

Re: Samsung pn60e530a3f sound no picture

For test patters connect holes 3 and 4 with a bit of wire, located here:

[newtothis]

Re: Samsung pn60e530a3f sound no picture

For test patters connect holes 3 and 4 with a bit of wire, located here:

Need to remove LVDS cable too

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

Found the vscan and the ve points voltage on power up is correct -198 and 98 on start up. After 5 second the voltages begin to drop.

Newtothis said I need to remove the lvds cable. Which one I have 5 ribbons. Two go to the lower boards. One to the y-main, x-main and one to the video input board. I assume it is the video input cable he referred to.

[newtothis]

Re: Samsung pn60e530a3f sound no picture

Yes to your assumption

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

No display pattern, no flash of screen.

[newtothis]

Re: Samsung pn60e530a3f sound no picture

Ok rules out mainboard, Unfortunately that's as much as I can help regarding Plasma

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

Thank you for trying.

[Hamie]

Re: Samsung pn60e530a3f sound no picture

You positive the panel isn't cracked?

Get a torch and shine it into the corners, even the smallest crack will result in this fault.

[tom66]

Re: Samsung pn60e530a3f sound no picture

There's a pretty common fault on these caused by a bad SMPS controller IC on the Y-main, but it usually causes Vsc to stay low. Thread here, if you wanna try a quick check or two:
https://www.badcaps.net/forum/showthread.php?t=43075

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

Well anything could happen. The tv would turn on every other time when I started this. I have not been able to see a crack yet.

Thanks tom66 I did read through that one.

[johns1mj]

Re: Samsung pn60e530a3f sound no picture

Looks like multiple bad boards. ok up date. Bad y buffer board. I changed two capacitors for looks. They tested fine off the tv. All voltages were good. I swapped y buffer for fun and it fires right up.

[drussell]

Re: Samsung pn60e530a3f sound no picture

Looks like multiple bad boards. ok up date. Bad y buffer board. I changed two capacitors for looks. They tested fine off the tv. All voltages were good.

All va, vs,vscan and ve all checked good on startup. Just for fun I swapped y buffer boards. tv fired right up. So I have 2 bad y mains and at least one bad buffer.

You should always be testing the Y-buffers boards for shorts before trying to power one up, especially if they came from a cracked-screen set since that is the most likely part to blow. (Not that they will always show a short if they are bad but it is a definite bad sign if anything is shorted.) You're lucky you didn't blow a good Y-Main board with a bad buffer board.

The Y-Mains are often easy to fix. Check the non-working Y-Mains for shorts in the power devices and if there don't seem to be any, verify that they do not have the -Vscan problem. Those seem to be by far the most common faults on these sets.

It is much easier with a working TV to test and repair anything that is an easy fix so you have spares.