Samsung 59" Plasma 3D Blank Screen

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

It just occurred to me maybe the PSU could be faulty? The PSU seems to be functioning correctly for all the other components, but when I managed to get an image on the screen, it was another TV powering its own tuner board.. I just did a voltage check on the inputs from the PSU, printed on board is 2 different voltages, 5V and 15V. the 5V reads 5.35V, and the 15V reads 15.05V. Is the 5V too high or is that expected?

Regards

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Thanks, I tried to attach but not sure if it has worked.. Anyway the voltage regulators as you have circled;

Top Left: IC707_3V3 - 17-33Z 1105AG
Left Pin: 5.34V
Right Pin: 0V

Top Right: IC203 - N055 950T45
Left Pin: 2.50V
Right Pin: 3.30V

Bottom: IC708_1V6 - 17-18Z 1022BG
Left Pin: 3.30V
Right Pin: 0V

Both processors are luke warm after 5 minutes.

My eyes may have deceived me when taking the model numbers..

Regards

My error. Could you check the tab pin too? So far, those readings look good, though.

Warm processors are good.

I'm trying to find a service manual for this TV, but I'm having no luck.

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

It just occurred to me maybe the PSU could be faulty? The PSU seems to be functioning correctly for all the other components, but when I managed to get an image on the screen, it was another TV powering its own tuner board.. I just did a voltage check on the inputs from the PSU, printed on board is 2 different voltages, 5V and 15V. the 5V reads 5.35V, and the 15V reads 15.05V. Is the 5V too high or is that expected?

Regards

That's probably okay, most Samsungs I have seen have a ~5.4V rail instead of a 5V rail.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

By tab pin are you referring to the middle pin that is not connected? If so;

Top Left: IC707_3V3 - 17-33Z 1105AG
Middle Pin: 3.3V

Top Right: IC203 - N055 950T45
Middle Pin: 0V

Bottom: IC708_1V6 - 17-18Z 1022BG
Middle Pin: 1.78V

Regards

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

There is also another voltage regulator located near the middle of the board, which has been blanked out by the light of the camera in the first picture.. it is;

IC205 - 1117Z 1105EG
Left Pin: 3.3V
Middle Pin: 1.5V
Right Pin: 0.26V

Regards

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

If it will help you find a service manual, the same board appears to be in several other models; PN59D6500, PN59D7000, PN51D7000, PN51D8000.. and since my model is a PS59D550, I would assume it is in any PN51D, PN59D, PS51D, and PS59D models.

Many thanks

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

All regulators seem okay.

http://elektrotanya.com/samsung_ps51.../download.html

^Manual.

Perform some of the checks in the 04_troubleshooting file.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Hi Tom, thanks, I have looked through the file, nothing seems to relate to this problem and I can't see any necessary checks..


Regards

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Hi Tom, thanks, I have looked through the file, nothing seems to relate to this problem and I can't see any necessary checks..


Regards

I guess you will need to find a new main board then. Do you have a part #? I might be able to find you the right part.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

That sucks I am really no expect but it seems like the hardware is actually fine but the software is corrupt, is there anyway to reset it? Like with the old ones, you could short out some pins on the EEPROM? The model is a BN41-01605A, I have tried to find one but they only seem to crop up in America, which I don't think would be a use for me as it probably will not have compatibility with our signal format (being NTSC and we are PAL).. although the loss of Freeview it not a major loss I guess.. Anyway, I really appreciate all your help, thank you!

EDIT -- I miss typed the model number, it is now correct, BN41-01605A

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

That sucks I am really no expect but it seems like the hardware is actually fine but the software is corrupt, is there anyway to reset it? Like with the old ones, you could short out some pins on the EEPROM? The model is a BN41-01605A, I have tried to find one but they only seem to crop up in America, which I don't think would be a use for me as it probably will not have compatibility with our signal format (being NTSC and we are PAL).. although the loss of Freeview it not a major loss I guess.. Anyway, I really appreciate all your help, thank you!

EDIT -- I miss typed the model number, it is now correct, BN41-01605A

It is sometimes possible to reset over USB:

http://www.samsung.com/au/consumer/t...il&tab=support

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I just tried, there is no USB activity at all (my USB stick lights up when there is power to it) , also the model is PS59D6900 as I have just noticed when I looked round the back.. oops

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

I just tried, there is no USB activity at all (my USB stick lights up when there is power to it) , also the model is PS59D6900 as I have just noticed when I looked round the back.. oops

Well, this could be the problem, maybe the 5V rail on the motherboard is not functioning! And thus it would not start up.

Do you have a USB charger which you could plug your USB stick into - just to see if it lights up when powered but with no data transfer.

Or you could try a computer in standby mode - some provide power to USB when in standby but don't transfer data.

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I knew, as much as I thought I will never need it again, I would regret throwing out my iPhone charger lol...

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

How exactly do these boards use the 2 different voltages? I always just assumed the 5V rail is for standby and the 13V rail is for when it is fully turned on.. are they both used in both scenarios? I am fairly sure the board is fully functional in terms of standby, since the TV buttons are responsive

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

Also, the LED module is completely separate to the button module, they both have their own separate connections to the mainboard. I think the LED module itself controls the flashing of the LED to the remote response, which is why it responds to the remote whereas the TV buttons do not after the TV has turned on.

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

How exactly do these boards use the 2 different voltages? I always just assumed the 5V rail is for standby and the 13V rail is for when it is fully turned on.. are they both used in both scenarios? I am fairly sure the board is fully functional in terms of standby, since the TV buttons are responsive

The 15V is probably used for audio and not much else. 5.4V runs everything else.

It's apparent this TV does not have a standby power supply. Probably because it's cheaper (and possibly more efficient) to use one supply and just put the processors into sleep mode.

5.4V is too high for USB (max 5.25V) so it's probably regulated down to 5V, or the 15V is regulated. To reduce costs, Samsung might power other things off this 5V rail. Yes, they would do this even on a £1,200 TV.

Also, the LED module is completely separate to the button module, they both have their own separate connections to the mainboard. I think the LED module itself controls the flashing of the LED to the remote response, which is why it responds to the remote whereas the TV buttons do not after the TV has turned on.

Can you post a pic of the LED module?

[graham01]

Re: Samsung 59" Plasma 3D Blank Screen

I managed to find a USB charger, I was wrong, the light does not come on.. BUT I just checked the voltage of the USB ports on the TV, there is only 1 pin showing 0.03V.. however I checked some pins on the PC input, one of them is 4.93V and another is about 3V. I will take a picture of the LED module (is this an adequate name for it? I am not very good with correct names of things..I am talking about the electronics for the LED light on the front of the TV)

Regards

[graham01]

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!

[tom66]

Re: Samsung 59" Plasma 3D Blank Screen

Some tests to perform - Check the voltages, relative to the case, of these pins on these TINY components (near the USB port.) Do this with power applied.

I'm trying to figure out if this is a regulator; if it is, then maybe it's being shut down in standby and it's not actually a problem.

4.93V and 3V is common. 4.93V is power, the 3V indicates the port is high speed (480 Mbit/s) capable (from what I remember from the USB spec.)

I might call it a power indicator, LED module could get confused with LED backlit LCD, but I know what you mean.