Samsung LED UE22ES5000 bootloop

[Wolfmann]

Model: UE22ES5000
PSU: BN44-00505B
Mainboard: BN41-01798

Firm ver. 1028.( is not posible to update the firm via OTA, just USB, because the tv it doesn´t have an internet conection) Nobody had updated the firm, is the same from factory.

The sintomps are the next. Standby light works, but when i power on the tv, it just shows the samsung logo and then turn off and do the same thing again and again.

I replaced all the caps form the PSU(except the big one), the Output voltages seems to be OK. (Tested with a digital multimeter)(In the high voltage cap i get 299-305 volts). I tried to do an EEPROM reset conecting VCC+SDA and conected the tv to the electrical outlet for 5-6 seg. No change at all.

Sometimes i disconect the psu, to test the voltages and i manually diconect all the flex cables. Then when i put it back togheter the tv actually work for some times maybe 2-3 hours ( perfectly , without no issues), then the standby light and the tv goes completely off.

I dont know what to do next.
Thank you people.

Mainboard


PSU

[dskall]

Re: Samsung LED UE22ES5000 bootloop

What do you get on main cap when you push power button?

[Wolfmann]

Re: Samsung LED UE22ES5000 bootloop

What do you get on main cap when you push power button?

When is on StandBy i get exactly 300 volt. I´ve tried to turn the tv on but i couldn´t . Just Stanby light flashing but not turn on (when stb light flash i still get 300 volt). Standby light just died after 15-20 minutes of trying to turn on the tv.

Note: When i first changed the caps, i´ve chaged the 10v 1000uf (2caps) for 25v 1000uf caps.(because i thought it was better) ¿Do you thing this could represent any problem for the psu.

[dskall]

Re: Samsung LED UE22ES5000 bootloop

When you try turning it on do you get any voltage at p_on pin?

[Wolfmann]

Re: Samsung LED UE22ES5000 bootloop

When you try turning it on do you get any voltage at p_on pin?

I resoldered all this parts and now the tv seems to work perfectly. I suppouse it was a power related issue.

[budm]

Re: Samsung LED UE22ES5000 bootloop

I would resolder a bunch of solder pads of transformer pins, any large devices mounted on the heatsink, Through hole power resistors, through hole rivets such as used on the transformer legs.

[Wolfmann]

Re: Samsung LED UE22ES5000 bootloop

I would resolder a bunch of solder pads of transformer pins, any large devices mounted on the heatsink, Through hole power resistors, through hole rivets such as used on the transformer legs.

Thanks bud. I would do that.

After I resolded all the parts. I clean all with sanitary alcohol (I don't thing that was a good idea) The point is that I removed all the protective lacking that the psu had and now it has like a strange color.

Do you think is necessary to apply somo special pvb varnish to the psu?

[dskall]

Re: Samsung LED UE22ES5000 bootloop

Some strong alcohol. First I heard of removing coating. I wouldn't worry about it. Shouldn't cause problems.

[Longbow]

Re: Samsung LED UE22ES5000 bootloop

I would resolder a bunch of solder pads of transformer pins, any large devices mounted on the heatsink, Through hole power resistors, through hole rivets such as used on the transformer legs.

You are right that resoldering is often valuable, especially if you've reached a dead-end in your troubleshooting. But with the given symptoms I think that Wolfmann was very near to confirming his problem. I always hate to move into the shotgun phase before it is really necessary.

[budm]

Re: Samsung LED UE22ES5000 bootloop

Resoldering the joints is part of the repair works to prevent future joints failure, I do it related to the problem or not, I can see ring developing around RX802 where through hole rivets are used.

[islammostafa.me19]

Re: Samsung LED UE22ES5000 bootloop

thanks