Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Pin 6 is the BL-ON control line that the main board supplies the HIGH to turn on the backlifghts circuit in the power supply/led driver board, the line is held LOW when TV is in standby or in power off, when the power switch is activated, the main board will allow the BL-ON line to go HIGH (it is pulled HIGH by the pull-resistor on the power supply board).
So what happen in your case (if you did measure the bl-on pin correctly) is the BL-ON line is kept LOW by the main board so it cannot go high to turn on the backlights. It does not affect other functions of the TV.

[ralphlamao]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Pulled the Pin6 wire from the connector. Standby light still blinks as before / tv behavior is unchanged. Also tested voltage again at the Pin6 wire and again read zero volts. Tested continuity to ground and there is a circuit, just no voltage.

I really appreciate your help, by the way.

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

I would expect Voltage at pin 6 to be pulled up high by the resistor, so need more tracing on that pin 6, there should be at least resistor on that pin and A5V pin, not much I can do on my side here since I do nit have the diagram or the board in front of me, otherwise you can try using resistor between pin 6 and A5V to see what happen.

[ralphlamao]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

This has been interesting, but I think I've reached the point where I should just wait and see if the replacement main board fixes everything. You've been very helpful and I'm 95% sure I've followed your instructions correctly but I'm afraid I'm going to accidentally electrocute myself on the power supply. Also I haven't got any resistors to perform the next step with anyway.

[ralphlamao]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

It was the power supply. Used piece from shopjimmy fixed her right up. Should have gone with my gut and replaced it first; the fact the backlights didn't come on with the mainboard disconnected should have been the proper tell, but I was flustered and the standby light WAS blinking (had some power, anyway), in my logic's defense.

I think I'll rebuild my bad PSU and keep it around as a spare.

[tom66]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Nice to hear it's fixed. I wish I could get access to 2012+ power board schematics but I don't think Samsung publish them any more. Really awkward as a lot of these sets seem to be dying now.

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Hello guys,
Working on a UN55ES6100 that have sound but no picture. You can see image with a flash light. Disconnected Main board from power board and panel is not lighting up. (I found that testing of power board in other threads).

I'm checking voltages and things seem to be be fine. I still went ahead and changed IC8101 (SLC2012M) and no change or whatsoever. Pin 1 measures 12V , Pin 8: 5V, Pin2:3.8 V. (Picture with red arrow)

Also checked voltage on connector CNL802,(Blue color arrow) which is the connector where you plug in the wires that come from panel and I get 306V-322V (voltage fluctuates).

Any idea if these are the right voltages, my power supply is defective or if Im possibly facing a defect in panel.

Any suggestion will be appreciated.
Thank you

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

The LED strings are connected in series, Output Voltage that high indicates you either has open (or high resistance) LED, or bad connection to the LED string.
What DCV do you get on the connector last two pins (5 & 6)?
Similar to this one:
https://www.badcaps.net/forum/showthread.php?t=42059
BTW, you should also start the new thread since your TV is not the exact same model as the OP, also upload good clear pictures of the whole backside of the TV and the boards both top and bottom sides.

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Thank you.
Reading voltages on that connector I get: (Circuit board off the tv)


1. R+: Goes up and down between 302-322v
2. R+: 302-322v
3. NC
4. R- 0
5. NC
6. L+
7. NC
8. L- 0.59
9. L- 0.59
10. NC

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Sorry did not read about the new thread. I will do it.

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

OK, you have open connection or open circuit LED/s.
Pin 1 & 2 (R+) are tied together and connected to the Anode of the Right string LED, the Cathode of the Right string is connected to pin 4 (R-) which is also tied to Pin 6 (L+) which is connected to the Anode of the Left LED string, the Cathode of the left LED string is connected to Pin 8 & 9 for the LED strings current return line through MOSFET and current sensing resistor to maintain constant current through the LED strings.

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Bad LED ? I'm assuming panel needed.

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Bad LED ? I'm assuming panel needed.

Well, if you are lucky it can be bad connection at the connectors on the LED string assembly, bad LED will be a lot more difficult to get and replace. Taking apart a 55" panel to get to the LED string assemblies will not be easy either for beginner.

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Thank you so much for your time. The tv broke after a power surge in the house. Everything came back on except tv. I'm guessing an LED in the panel probably burned.

Is there any doubt that power supply could be damage? Any other voltage maybe that i could check?

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Just making sure. When I gave you the readings of the connector, the circuit board was not connected to the tv. I have the power supply board on my desk with power cord connected.

Does that change anything?

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Nothing that I can think of since you do have boosted output Voltage to drive the LED strings and sound and pictures (using flash lights) which means the power supply board is getting the PS-ON and the Bl-on command signals from the main board to turn on the main power supply and the LED driver circuit to produce the boosted Voltage for the LED string.
There are so many TVs with LED backlights that fail within a couple years that we have seen a lot in BADCAPS.NET.
I would not want to own one.

[Louis82]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Just making sure. When I gave you the readings of the connector, the circuit board was not connected to the tv or panel. I have the power supply board on my desk with power cord connected only. (no main board)

Does that change anything?

[budm]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Just making sure. When I gave you the readings of the connector, the circuit board was not connected to the tv or panel. I have the power supply board on my desk with power cord connected only. (no main board)

Does that change anything?

Ah, that is very important info. Yes, you have to have the Load (in this case, the LED strings). If you still get about the same readings then we know you have open circuit.
So take the readings with the connector back in place.

[princy80]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Good chance it's the main board at fault. If not, could be a shorted LCD panel (unrepairable) or bad LED strip (hard to repair)

Try removing the T-con board connector (it's the thin wide black one going to the bottom of the panel) and seeing if the TV powers on (no picture will appear.) Also try removing the connector between the main board and power board - do you get a backlight on the screen with the TV plugged in?

I have a similar problem & I tried this step. My TV turns on, I did a factory reset. I was going through the standard set up, it turns off again.

The backlight screen turns on when I apply power. We did have a lightning close to our home a few days ago. It worked fine for a few days (almost a month) now it doesn't.

I have a samsung UN55ES6150FXZA

[rdmaster]

Re: Problem with Samsung UN55ES6150F - Wont power up, 10 standby blinks

Hello all newbie here. I have a Samsung Un55es6150f No backlight, Have images and menus with flash light on screen and audio
Brought it to a repair place for free est. Says it's the led's

Okay well common sense, is it power board, main board or led's and even stated by the tech the panel. Could not get a straight ahead answer but says it's not worth fixing. Wow 18 months old and 1000 bucks later can't be fixed. Well I am a handy guy so I searched and found it unreal how many Led tv's basically blow up so prematurely. I also asked the tech you stated bad led panel. After seeing video they are led's built into the panel so can I fix them. He laughed. Well now I'm here asking is it possible and how and where can I obtain the strips if so. First off I did the power tests. I have menu's with flash light test and audio, I also get the 5 blinks every 2 seconds on power led, I also unplugged main board from Power board and no backlight leds at all. I do have a volt meter and can check if a clue had where and how. I am also willing to take apart the panel if that's how led's need to be fixed. I have no clue if they are side light led's or under the lcd panel. Any help would be appreciated. I think I will go with my gut of just the power board but no clue to be sure of any of this