Samsung LE37A556P1F Flashing red light

[budm]

Re: Samsung LE37A556P1F Flashing red light

I think you are missing some value in the calculation (the 1.25v ref), see page 8 for calculation which might be clearer than the LM1117XXX SPEC SHEET.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

Yeah that's a different way of working it out il have a look at that now.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

Looking at that calculation I should have been getting 1.5v and 1.7v.

When these regulators go do they make any sort of a noise as when I got the TV it would also make a high pitched noise which sounded like it may have come from one of the components when it did?

I have just thought that if I wire up the second board I can measure the regulators there and see if they are any different too.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

Tried the second board and the those Adjustable regulators are giving off the same readings as the original board.

[budm]

Re: Samsung LE37A556P1F Flashing red light

OK, your DC supply seems to be OK, next step will involve traing out Main board control signals which will be real hard without the service manual, even if you trace it out back to the CPU pin, there is no easy way to verify is the CPU is good or not. I really do not have any more suggestion on this.
Bad regulator will either put out nothing, too high, or to low voltages.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

I have looked for a service manual and one of the troubleshooting tests was to check BD2107 which should have 12v running across it. I have checked this on my board and there is nothing running across it. This is supposed to have something to do with the sound. Am i right in thinking that the board may be getting the lower voltages but not the higher ones maybe?

Whats the best way of checking the board for the 12v supply?

[budm]

Re: Samsung LE37A556P1F Flashing red light

Do you get 12vdc on either end of the BD2107 and ground (one lead of the meter to GND, and another lead for probing either end of the BD2107)? I thkink this BD is the line filter. So you do have the service manual?

[Scenic]

Re: Samsung LE37A556P1F Flashing red light

In my case (BN44-00199A PSU from a 40" LCD), the PSU had a split 12V (actually 13V) output, on mine labelled 13Vm and 13Vs.

13Vm = 13V mainboard voltage ("general purpose" .. to be stepped down via LDO's mostly)
13Vs = 13V exclusively for the sound part (amplifier)

the main 13V rail also was considerably more beefy (3.xA) compared to the sound one (1.xA)

You might find the same setup on your PSU board, just with a voltage missing.

Also after a bit of googling I found out what that IC in your attached picture is.
Guess what? The NTP-3100 series is a digital amplifier IC made by "Neo Fidelity Inc. Korea"

Of course, no datasheets or anything available on their useless website.
http://www.neofidelity.com/eng/techn...digital-tv.php

I'd say check the voltages on the PSU connector going to the mainboard. Should be silkscreened which pin is what (either on the front or the back of the PSU board)

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

Do you get 12vdc on either end of the BD2107 and ground (one lead of the meter to GND, and another lead for probing either end of the BD2107)? I thkink this BD is the line filter. So you do have the service manual?

Checked it properly and there does appear to be the right voltage across BD2107.

It was just a 4 page trouble shooting guide which I cannot seem to find now.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

In my case (BN44-00199A PSU from a 40" LCD), the PSU had a split 12V (actually 13V) output, on mine labelled 13Vm and 13Vs.

13Vm = 13V mainboard voltage ("general purpose" .. to be stepped down via LDO's mostly)
13Vs = 13V exclusively for the sound part (amplifier)

the main 13V rail also was considerably more beefy (3.xA) compared to the sound one (1.xA)

You might find the same setup on your PSU board, just with a voltage missing.

Also after a bit of googling I found out what that IC in your attached picture is.
Guess what? The NTP-3100 series is a digital amplifier IC made by "Neo Fidelity Inc. Korea"

Of course, no datasheets or anything available on their useless website.
http://www.neofidelity.com/eng/techn...digital-tv.php

I'd say check the voltages on the PSU connector going to the mainboard. Should be silkscreened which pin is what (either on the front or the back of the PSU board)

Ta I have now checked all of the pins on the big connector which connects the PSU and the mainboard. They all seem to match what they should according to the diagram on the top of the board.

With no sound and no picture the mainboard must be completely goosed.

[Scenic]

Re: Samsung LE37A556P1F Flashing red light

If that's the case, there's a matching board available on ebay UK for 27 pounds incl. shipping

ebay # is 270923709503
(copy & paste that number into the search)

There are a few more but the one above happens to be the cheapest one and has roughly 1 day left.


edit: now that I look at the pics, that board looks VERY similar to the one in my Samsung LE40A536, which also had mainboard problems (restarted every 10-15secs, nothing seemed to fix it). Got a new board and everything worked just fine.

Seems like the A-series (LExxAxxx .. the "A" indicating the year 2008) Samsung LCDs have mainboard probs quite often..

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

If that's the case, there's a matching board available on ebay UK for 27 pounds incl. shipping

ebay # is 270923709503
(copy & paste that number into the search)

There are a few more but the one above happens to be the cheapest one and has roughly 1 day left.

I have been looking on Ebay for a replacement board but havent found one as of yet.

The item number you sent across is a similar one but that has 3 hdmi sockets where as the one that's in it has 3.

I have a second board that again looked similar but did not work.

If you see any other please send me the item numbers and I will have a look.

Ta.

[budm]

Re: Samsung LE37A556P1F Flashing red light

I just saw on the news that Samsung had settled the class action lawsuit for TV made during 2006~2008 due to bad caps problem, I am sure you can Google that news.

[Scenic]

Re: Samsung LE37A556P1F Flashing red light

Uhm... in post #8 you said it was a BN41-00974B "EMMA" board, which is what I searched for !?

edit: wait a second... the mainboard picture in post #9 says it's a BN41-00813E "BORDEAUX PLUS" (codename) in the top left corner (above the CI card slot.. where the white arrow points to).

Searched for that and found a few boards. Apparently, this board or a slight variation of it was used in the LExxM86BD and M87BD series TVs. Those had problems with a corrupted user-settings EEPROM (just like the R88 series) on the board, preventing them from being turned on.

I've attached a marked pic of the backside of your mainboard. Could you list what it says on the marked 8pin chips?

One of them should be a 256KBit EEPROM, usually from Atmel.
It should say ATML in the first line, and either "(AT)24C256B" or "2EB1" in the 2nd line.

Resetting that (or replacing it) could bring it back to life. I remember that when I played with the service menu settings on my Samsung too much, it wouldn't turn on anymore (LED blinks a few times, then goes steady (standby mode))
Had to reset the EEPROM to get it to boot properly again.

Tell me if you found it.. the reset procedure is a bit tricky, but unlike buying a blank replacement, it's free

edit: the BN41-00813E board is quite a bit more expensive *click*

[budm]

Re: Samsung LE37A556P1F Flashing red light

Please let me know how you go about resetting the EEPROM, that may come in handy one day, thanks.

[Jasgriff]

Re: Samsung LE37A556P1F Flashing red light

Uhm... in post #8 you said it was a BN41-00974B "EMMA" board, which is what I searched for !?

edit: wait a second... the mainboard picture in post #9 says it's a BN41-00813E "BORDEAUX PLUS" (codename) in the top left corner (above the CI card slot.. where the white arrow points to).

Searched for that and found a few boards. Apparently, this board or a slight variation of it was used in the LExxM86BD and M87BD series TVs. Those had problems with a corrupted user-settings EEPROM (just like the R88 series) on the board, preventing them from being turned on.

I've attached a marked pic of the backside of your mainboard. Could you list what it says on the marked 8pin chips?

One of them should be a 256KBit EEPROM, usually from Atmel.
It should say ATML in the first line, and either "(AT)24C256B" or "2EB1" in the 2nd line.

Resetting that (or replacing it) could bring it back to life. I remember that when I played with the service menu settings on my Samsung too much, it wouldn't turn on anymore (LED blinks a few times, then goes steady (standby mode))
Had to reset the EEPROM to get it to boot properly again.

Tell me if you found it.. the reset procedure is a bit tricky, but unlike buying a blank replacement, it's free

edit: the BN41-00813E board is quite a bit more expensive *click*

Ahhh I will have a look at this and get back to you tomorrow. I would love to do it now but its my Birthday and apparently I now have to sit with my GF and watch a film!

[Scenic]

Re: Samsung LE37A556P1F Flashing red light

Please let me know how you go about resetting the EEPROM, that may come in handy one day, thanks.

8 pin SMD EEPROM on the bottom of the board, close to where the CI card slot is.

Most of the time it's from Atmel, so it will have ATML followed by a cryptic datecode in the first line.
2nd line should be either (AT)24C256B or "2EB1" (which is Atmel's cryptic way of saying it's a 24C256B)

You need to short out the clock and data pins (pin 5 and 6). Even without the datasheet handy they're easy to identify cause they always have 100ohm SMD resistors connected to them. Otherwise see attached pic.

Solder 2 relatively long wires to those pins and put the board back in place and connect it all up. Plug the powercord in and when it tries to start up (blinking power LED), short those wires for a few secs. Might take a few tries. Unplug the set, remove the short and grab your remote.

Now plug it in again. It should stay in standby.. If not, try turning it off (solid LED).
Then start the TV up in service mode. You do this with the remote. In order, press INFO, MENU, MUTE, POWER. The TV should start up and display the service menu on top of everything else.

Go into the "Option table" menu, make sure "Tuner" is set to AUTO and "Store Demo" is OFF (use the arrow keys and enter, menu button goes back).
Then do a Factory Reset. TV should turn off after a while.

That should be it. Attached a few demo screens of the Samsung service menu I last saw. Yours should be similar. If not, take a few pics and post them.

edit: happy birthday Jasgriff

[py3m4n]

Re: Samsung LE37A556P1F Flashing red light

I wasn't aware this was also a problem on the 5 series and from what I read it isn't. Here's hoping this turns out to be a case of 'don't believe everything you read on the internet'. Any 5 series I have replaced caps on I have never had to replace the eeprom on the mainboard. I have only had to do it with the older R series, although I know it does happen on the M series and S series LCD's and Q series plasmas.

If your handy with a soldering iron I wouldn't waste your time trying to reset it, your better off just replacing it, save yourself the grief of possibly ending up with some functions still corrupted and or picture problems on some inputs.

The Atmel AT24C256B is no longer manufactured so getting your hands on one for a sensible price will be difficult. There are sellers here in the U.K selling them on Fleabay but they are asking £2 with £1.50 P+P!!

I have found a comparable epprom for replacing the AT24C256B but I am not sure if it will be alright. Can anyone with more knowledge tell me if it would be a good replacement. It's a Microchip 24LC256-I/P. The only difference I can see is the clock rate is 2Mhz instead of 1Mhz. Should be good but it's always best to ask before going and buying a pile of them!

Remember to let us all know how you get on Jasgriff. I too am keen to find out if this does occur with the 5 series Sammys.

Edit: Forgot to say HAPPY BIRTHDAY!!

[Scenic]

Re: Samsung LE37A556P1F Flashing red light

I wasn't aware this was also a problem on the 5 series and from what I read it isn't. [...] although I know it does happen on the M series and S series LCD's and Q series plasmas.

This is the same board (BN41-00813E) he posted a pic of in post #9 i believe.
http://ebay.co.uk/itm/290677868206
It says it's for the LEM87BDX, and the other auctions I found also listed it for the M86/M87 series or the BN41-00813B (slight board variation) for a PS42Q96HDX plasma.

The LE__A556 seems to share the same mainboard, with the same problems.

[py3m4n]

Re: Samsung LE37A556P1F Flashing red light

From what Scenic has shown and from googling away you come to realise that this board and it's variations have been used extensively in Samsung LCDs and Plasmas from 2006 - 2008. So replacing the eeprom should solve your issues.

Edit: Same goes for Techamp if he is still reading this thread. From what he has said replacing the eeprom will solve his issues too.