Samsung PS51D6900DSxxc- Stays in standby

[curro]

hello.

My tv samsung PS51D6900DS, Remains in stb, and not turn it on, connect ac
you hear two clicks in the relays, to give the power button on the TV flashes but not light activity ... or heard.

I checked voltages and everything is correct, I have even bridged ground pson
and if the relay acts, it seems that is the Main, ref: BN41 01605A.

Could the eeprom Resetar ref: 034755C ATML110 2EC 8?
Any suggestions ..?

voltages:

1 stb) 0.1v
2 pson) 5.2V
3)
4) 15v
5)
6)
7) 5.2V
8) 5.2V
9)
10) 15v
11) 15v
12) 5.2V

I appreciate your help.

Greetings.

Curro.

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

In a dark room -- no flickers at all from the plasma panel?

There is a "control board" which connects to the Y-main (left large board, looking from the rear), X-main (right rear board), X-buffers, and main board. This usually has a blinking light on it. Is this light blinking?

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Hello tom66.

If the LED on the keypad to connect the TV to an AC outlet, blinks
rtiempo whole.
when I give the power button on the remote blinks a few times and then paid the led, however not heard any activity.

On the back there is indeed a green LED, but is in the logic-board, this is active 5-seconds and between 2 and 3 seconds off.

Thank you very much for the help tom66.

Sorry for the grammar.

Greetings. Curro

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

See this video quickly from a PS42B450 (different model but around the same generation as your D6900.)

https://www.youtube.com/watch?v=Bmu12mCOKcU&t=2s

Does the LED blink like in the video? Continuously? That one had a failed X-main board, but the control board was still functional.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Tom66 I've seen the video, but my tv does not have myself reconnected to the wall outlet and the LED flashes as 2 or 4 seconds then off, to give power to control the LED blinks a few times and then lED goes out, that is quite normal as it did when it was going well.

Anyway, even assuming that some of the plates were YSUS ZSUS by disconnecting the tv would have to turn and the less encuchar .. am I right?

Of course you would know me that current must reach the keypad ... I made a measurement and see what comes 1.9V, voltage is this correct?


Thanks again tom66

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

Sorry, I am not talking about the keypad. I'm talking about an internal LED -- the green blinking one in first few seconds of the video. If you're unsure, post a picture of the insides of your TV and I'll highlight it.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

About the green LED rear lights at all with the flashing time, mine is much slower

I've got some photos if something can help.


https://skydrive.live.com/redir?resi...JdkLEFwI7d-I9w

thanks.



I am having trouble uploading photos, I'm on it
Sorry.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Well, I'm still in the relentless pursuit of the fault.

I found the cable FLEXCON shabby.

The TV still no sign of life, but I'm getting closer ..

Any help is welcome.

[ben7]

Re: Samsung PS51D6900DSxxc- Stays in standby

Is the PSU good?

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

OK, next steps.

In the picture below the Y-main is left hand board, X-main is right hand board. Between Y-main and plasma panel there are the buffer boards. The X-main signal goes through a distribution board, but this is just like a piece of wire (it usually has no functionality.) The power supply is the middle board.

https://skydrive.live.com/?cid=EB469...FBD33875%21109

Turn the TV off and wait 30 seconds.
Unplug the main power connector going from the power supply to the Y-main.
Try to turn the TV on. Does it turn on now and make the Samsung tone?
If so, the Y-main or Y-buffers are at fault.

If not:
Turn the TV off and wait 30 seconds.
Unplug the main power connector going from the Y-main to thepower supply X-main.
Try to turn the TV on. Does it turn on now and make the Samsung tone?
If so, the X-main is at fault.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Is the PSU good?

Yes psu is good, i have voltaje vs: 3.5v 5.3v. but not Va.

Thank you very much for the help

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

OK, next steps.

In the picture below the Y-main is left hand board, X-main is right hand board. Between Y-main and plasma panel there are the buffer boards. The X-main signal goes through a distribution board, but this is just like a piece of wire (it usually has no functionality.) The power supply is the middle board.

https://skydrive.live.com/?cid=EB469...FBD33875%21109

Turn the TV off and wait 30 seconds.
Unplug the main power connector going from the power supply to the Y-main.
Try to turn the TV on. Does it turn on now and make the Samsung tone?
If so, the Y-main or Y-buffers are at fault.

If not:
Turn the TV off and wait 30 seconds.
Unplug the main power connector going from the Y-main to thepower supply X-main.
Try to turn the TV on. Does it turn on now and make the Samsung tone?
If so, the X-main is at fault.

Hello tom66

I Followed the steps you said and still the same.
The Funny Thing Is that apparently all is well with correct voltages PSU and hot. Main-board with correct input voltages. but still no signs of life.

Thank you very much for the help

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

You have Vs?
But no Va?

It may be bad plasma panel (bad address buffers.) Can happen on Panasonic TVs. Not heard of it on a Samsung before, but it could happen.

To isolate the address buffers disconnect the connector in the image, make sure all other boards are connected.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

I followed your instructions and disconnect the connector of the image.
Connect everything else

But still in the same state., Stays stb


I appreciate your help.

[tw2005]

Re: Samsung PS51D6900DSxxc- Stays in standby

Sorry to jump in the middle here but just thought I'd mention to be careful with that address connector when reconnecting. I blew and destroyed the panel on a samsung because of residual power in the cct. It arced and that was that. i think there was 90V on that but it was a PS50Q91 and they were fed from the psu. Won't hurt to measure that lead before reconnecting.

It might not matter on yours but I just wanted to share that just in case.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Sorry to jump in the middle here but just thought I'd mention to be careful with that address connector when reconnecting. I blew and destroyed the panel on a samsung because of residual power in the cct. It arced and that was that. i think there was 90V on that but it was a PS50Q91 and they were fed from the psu. Won't hurt to measure that lead before reconnecting.

It might not matter on yours but I just wanted to share that just in case.

tw2005

I appreciate your comment.
It never hurts, this type of notes.

I checked voltages on this connector and 54v are present. But only when connected to the AC. Within seconds the voltage is 0

These readings are not very accurate in the absence of a good tester.

Thanks for commenting

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

Tom66

Has reflection mode correct me if I'm wrong:

Currently the Tv mode leaves no stb., I made voltage checks etc, and suddenly all these voltages are correct, I refer to the marking of the connectors themselves.

OK switching voltage is 15v 5.3vy, Ok I own these voltages.

The problem is that there is voltage va., Ie I have only a few sengundos current is when I connect the TV to the AC.

I have checked all diodes, resistors and relays the PSU. The PSU is heated and seems it works normally, Ok State, RL801S fed 5v (stb)
pson waiting, cut stb. Ok this means that I can rule out the PSU ...

Main-board hot chips all seem to work well., LVDS connector shabby.

Now to try to find fault if I disconnect all circuits except
PSU> Main-board> Logic-Main.

Should I have pitch speakers ... no? Mal continued without tone, stb Continuous mode.


Considerations to take into account:

Cable Flexcom 1110 (LVDS) linking the main-board with the logic, in very poor condition.
I think some pin pin not making contact with the connector. (I uploaded a picture)

Main-board LVDS connector shabby.

I tried resetting eeprom: aml110 2EC L 8, 034755C, by crossing sda / scl
few seconds. No results stb Continuous mode.

Keyboard seems to work well., Voltage variations detected by pressing the knob, but I'm not entirely sure, I just know what works in a range of about 3v.
Perhaps it would help to know how to make a bridge ....


Well my current test is THE FOLLOWING:

I disconnected everything except: PSU, MAIN-BOARD-LOGIC and keyboard.
I removed speakers, Flexcom wifi, and I focus on these four pieces.

This connected but still no sign of life. everything points to the Main ...

My current goal is only one: Having tone.
Obviously will connect the speakers, when listening activadad in the relays.



Greetings all.

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

You seem to have ruled out everything. There is one further test you can do though. Have you tried jumpering PS-ON to see if you get good supply voltages? I would be considering the main board right now.

[curro]

Re: Samsung PS51D6900DSxxc- Stays in standby

If bridge PS_ON, and all voltages are present.

From igualmanera when plugged into the AC, all voltages are present for a moment.

I'm looking at all the screws on the plates make good ground.

Finally the only thing I can think of is to remove the eepprom.


Any suggestions?

Thanks again tom66

[tom66]

Re: Samsung PS51D6900DSxxc- Stays in standby

In which case, my suspicion points to the main board but there is a way to eliminate the PSU, Y-main, Y-buffers, X-main, panel and control board.

There is a 4-pin connector on the top right of the this board:
https://skydrive.live.com/?cid=EB469...FBD33875%21119

Disconnect the main board, but everything else should be plugged in. You need to jumper PS-ON and get all voltages to appear.

Then jumper pins -- any two pins. It varies from chassis to chassis, so try them all. If it works, you will see alternating test patterns on the display. Then you know it must be the main board.