Samsung UE22ES5000wxxc turns off and turns on

[Nawual]

TV MODEL Samsung UE22ES5000wxxc

We have this tv in the workshop, and we have come to the conclusion that your problem, it is switched off and on continuously, is from the power source. Because it has all voltages present in the connector without having the mainboard connected, even turn on the LEDs.

But we did not find the scheme of this, and it is the first time I see that the power supply has all the voltages without the mainboard. The logical thing is to only have the standbye and when you bridge with the PS-ON have the rest of tensions.
I do not know how to start the checks, although I suspect IC PWM. I leave photos. Thank you in advance for your help.

Model power: BN44-00505B
[IMG][/IMG]

[tvtimmy]

Re: Samsung UE22ES5000wxxc turns off and turns on

There is a post in this forum(BN44-00505B) where the "Wolfman" fixed his set by re-soldering all the places circled in red. Type BN44-00505B in the advanced search box on the top of home page.

[R_J]

Re: Samsung UE22ES5000wxxc turns off and turns on

On many samsung power supplies, they use pull up resistors on the PS_ON and BL_ON lines, the main board will hold these lines LOW when the tv is off, That is why removing the main board plug will turn on the power supply and backlights

[budm]

Re: Samsung UE22ES5000wxxc turns off and turns on

On many samsung power supplies, they use pull up resistors on the PS_ON and BL_ON lines, the main board will hold these lines LOW when the tv is off, That is why removing the main board plug will turn on the power supply and backlights

+1, you can also verify that by checking the DC V on the PS-ON pin, if it does not have pull-up resistor then the Voltage will be closed to 0V, if it has pull-up resistor the it will be > 2V, same for the BL-ON pin.

[nomoresonys]

Re: Samsung UE22ES5000wxxc turns off and turns on

Test connector from mainboard to powerboard on powerboard side, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description and condition on and off, see if ps-on and bl-on voltage changes when power on is applied.

[Nawual]

Re: Samsung UE22ES5000wxxc turns off and turns on

Thanks to all for the info, I did not know what the main could keep those values. I will check that you have these resistances and I will make the measurements and put them here. Thanks again

[Nawual]

Re: Samsung UE22ES5000wxxc turns off and turns on

Hello again. I followed the post that told me tvtimmy and reviewed the solders what they indicate in a photo and I got the PSU to remain stable. Now the tv is repaired.
I leave the photo in case someone else needs it.
Thanks!
[IMG][/IMG]

[tvtimmy]

Re: Samsung UE22ES5000wxxc turns off and turns on

Thanks for the follow up, good job!

[FoxOnLine]

Re: Samsung UE22ES5000wxxc turns off and turns on

Good afternoon friends,
Can someone tell me the references of the QM861 and QM851 transistors, I have the QM861 broken and put the DM861 diode in a short circuit, I want to replace the QM861 and I don't know the reference to replace, I can't find the electrical diagram either, if anyone have can send it to me.
Thank you all for your attention.
FoxOnLine.