Samsung 59" Plasma 3D Blank Screen

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I am completely wrong again.. sorry.. what I thought was the LED module is the wifi adapter. It is confusingly placed to look like it houses the LED!

So... where is the LED seated?

(p.s. check post one page back for a check to perform.)

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

On the pins you are pointing to; Left one is ~0.02V, right one is 5.35V

Regards

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

On the pins you are pointing to; Left one is ~0.02V, right one is 5.35V

Regards

So, it looks like they feed 5.25V max USB devices with 5.35V... ah well...

It would seem that the controller just turns the USB power on or off, and doesn't indicate a fault on the motherboard. Did you do this while the TV was trying to turn on?

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

So... where is the LED seated?

(p.s. check post one page back for a check to perform.)

The LED is seated on the same small panel with the buttons, I can't get to it to take a picture.

So, it looks like they feed 5.25V max USB devices with 5.35V... ah well...

It would seem that the controller just turns the USB power on or off, and doesn't indicate a fault on the motherboard. Did you do this while the TV was trying to turn on?

Yes I took those values while the TV was trying to turn on. Could it be the voltage is just too high in that case? Can it be altered? I noticed on the PSU there is adjustable dials that require a cross-head screw driver named Vs and Va. (Don't worry I haven't touched them)

Regards

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

The LED is seated on the same small panel with the buttons, I can't get to it to take a picture.

Okay, that's fine. I don't think it's that important, anyway. I'm looking towards the main board for a problem.

Yes I took those values while the TV was trying to turn on. Could it be the voltage is just too high in that case? Can it be altered? I noticed on the PSU there is adjustable dials that require a cross-head screw driver named Vs and Va. (Don't worry I haven't touched them)

Regards

Vs and Va are for the plasma panel, and do not affect the main board. Those voltages are typically ~200V and ~70V. The fact you got a good picture when using a different LVDS source probably indicates a problem with the main board...

I don't think the voltage is too high. As I said Samsung seem to have a thing with 5.3V/5.4V rails. I see it in almost all of their products. I'm not sure if the number is lucky in Korea? :p

I've highlighted some more checks and part numbers to read off. I've used numbers this time, so refer to the numbers when you report the results.

With each numbered value, report the voltage there.

With each part number, report the part number on the chip (including both lines. e.g. "ATML24C32 QP3408") - this indicates a 32kbit 24C-series EEPROM by Atmel manufactured on the 34th week of 2008, with "QP" (some random letters) being a production lot code or something specific to Atmel.

AH... same problem you had, image comes out all blurry, one second while I upload it elsewhere...

Here it is: http://postimage.org/image/8mpgdd8x3/full/

There are 9 items on the image.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Okay, that's fine. I don't think it's that important, anyway. I'm looking towards the main board for a problem.



Vs and Va are for the plasma panel, and do not affect the main board. Those voltages are typically ~200V and ~70V. The fact you got a good picture when using a different LVDS source probably indicates a problem with the main board...

I don't think the voltage is too high. As I said Samsung seem to have a thing with 5.3V/5.4V rails. I see it in almost all of their products. I'm not sure if the number is lucky in Korea? :p

I've highlighted some more checks and part numbers to read off. I've used numbers this time, so refer to the numbers when you report the results.

With each numbered value, report the voltage there.

With each part number, report the part number on the chip (including both lines. e.g. "ATML24C32 QP3408") - this indicates a 32kbit 24EEPROM by Atmel manufactured on the 34th week of 2008, with "QP" (some random letters) being a production lot code or something specific to Atmel.

AH... same problem you had, image comes out all blurry, one second while I upload it elsewhere...

Here it is: http://postimage.org/image/8mpgdd8x3/full/

There are 9 items on the image.

Okay, I will do that now, do you only want me to check the voltage on each NUMBER? The EEPROMS do you only want a part number or a voltage too? If so which pin number(s) do I look at?

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Okay, I will do that now, do you only want me to check the voltage on each NUMBER? The EEPROMS do you only want a part number or a voltage too? If so which pin number(s) do I look at?

Voltage on each number.

Part number for each item indicated "Part #"... but basically all the 8 pin devices I've highlighted. Some (most) are EEPROMs, others are not. The reset trick might work with these. I'll be able to tell you which pins to jumper to reset it.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Here goes, again my eyes are not great at this kind of thing, and I really can't see the difference between 5's and S's!

1) 3.27V
2) 5.38V
3) 3.3V
4) 1.2V
5) 1.12V

6) 8) 9) S24CS0 2AVA4 D263

7) ATMLH110 2EC L B 0J23998C

Regards

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Okay, those readings are good.

An odd check here - try tapping the board and the LVDS connector. Bad solder joint maybe? Contact cleaner may help too. (Make sure it's not corrosive to plastic.)

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I don't think it will be bad connections, it could only be the LVDS but that wouldn't explain why the buttons are unresponsive and the TV refuses to turn off.. no other connections would give this problem either, should I just stick it in the oven for 20 minutes, fix any potential dry joints? :P

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I don't think it will be bad connections, it could only be the LVDS but that wouldn't explain why the buttons are unresponsive and the TV refuses to turn off.. no other connections would give this problem either, should I just stick it in the oven for 20 minutes, fix any potential dry joints? :P

You could give a try, but I'd limit it to 2 minutes at 230C.

I have seen loose LVDS cause lock ups with main boards as the TV tries to communicate with the control board (and expects a response) but it is rare and I've only seen it on one LCD and a T-con.

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I'm thinking of suggesting you try a reset on the EEPROMs. 6,8,9 are all EEPROMs. You probably don't need to worry about the HDMI ones.

I would suggest that you try a reset to the EEPROM closest to the main processor, but that's not an EEPROM. I think it's flash memory - probably for storing the settings of the TV. But I can't find a datasheet. Are you sure about the part #?

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I think I just tried to do an EEPROM reset but it didn't work, was I right trying to short the SDA to the GROUND on the AMTEL chip? It didn't have any effect anyway lol.. In to the oven!

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I think I just tried to do an EEPROM reset but it didn't work, was I right trying to short the SDA to the GROUND on the AMTEL chip? It didn't have any effect anyway lol.. In to the oven!

Usually it's SDA/SCL to each other. And that's not an EEPROM.

I just noticed the ATML chip has four points next to it, so it looks like it is programmable.

Everything on the board with a beige sticker on it is a memory probably with some software on it.

You may be able to buy a board from Samsung.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Okay, no more tips and tricks then? She is currently in the oven, are you sure 2 minutes is enough? When I had to fix my PS3 due to dry joints on the GPU, that had 20 minutes in the oven, stank the house out but it did the job!

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Okay, no more tips and tricks then? She is currently in the oven, are you sure 2 minutes is enough? When I had to fix my PS3 due to dry joints on the GPU, that had 20 minutes in the oven, stank the house out but it did the job!

2-3 minutes is commercial reflow time. 20 minutes will cook the motherboard.

Most manufacturers do not have problems with BGA any more - but it's worth a shot.

I'll try and put in as much advice as I can, but I'm no expert.

Main board with satellite/cable not Freeview: http://www.ebay.com/itm/BN94-04709A-...item336d4046dd

It looks like you could transplant the module from your board, or you could get an external Freeview box. I think it will work with PAL and NTSC as most TVs these days are dual standard.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I am lost for words.. 5 minutes in the oven seems to have repaired it :O I put it back in the TV and it works perfectly! :O :O My concern now though, is how often will this happen? I am over the moon about this haha! Thank you so much for all your help!

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I am lost for words.. 5 minutes in the oven seems to have repaired it :O I put it back in the TV and it works perfectly! :O :O My concern now though, is how often will this happen? I am over the moon about this haha! Thank you so much for all your help!

I have NO idea why that worked other than you might want to take out a lottery ticket tomorrow. Okay being serious it may be a BGA problem, in which case the repair is usually temporary. But if it's a connector problem then it might be a permanent fix.

Enjoy your TV, but consider the new main board in case it breaks again.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Thanks I did notice however, it most of the new Samsungs with more powerful processors, there are massive sticky heat pads on the back of the main board to transfer the heat from the processor to the main panel.. however this one does not have a pad, could this be the problem? it simply over heated because this was missed off during manufacture?

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Thanks I did notice however, it most of the new Samsungs with more powerful processors, there are massive sticky heat pads on the back of the main board to transfer the heat from the processor to the main panel.. however this one does not have a pad, could this be the problem? it simply over heated because this was missed off during manufacture?

Definitely a possibility, I would expect there to be a heatpad there. If you have an old motherboard lying around, consider ripping off the northbridge heatsink and retrofitting it on to that chip with a bit of thermal adhesive (don't use glue.)

Samsung are really cutting back on their manufacturing. I repaired a 42" Samsung Plasma recently and around the component connector Cr they had forgot to drill the right hole, making it very difficult to insert the Cr connector. I had to adjust the hole to make it work properly. A bit disappointing for a £350 42", would be very disappointed if they forgot that heatpad on a £1,200+ TV.