samsung UN22D5010 no power

[budm]

Re: samsung UN22D5010 no power

This is only 22" TV, it is not really worth it to get the new boards, but you can inspect all other components on the power supply, the main board, the LCD panel board, etc.

[jose6326]

Re: samsung UN22D5010 no power

What else should I test on the psu?

[jose6326]

Re: samsung UN22D5010 no power

I think the diodes are good

Dm801: 1st reading OFL, 2nd reading 0.469(leads reversed)
Dm802: 1st reading OFL, 2nd reading 0.453 (leads reversed)

[jose6326]

Re: samsung UN22D5010 no power

OK, that part is more likely to be the ref Diode which is part of the regulation feedback. Since it burnt so bad, that means the surge must have come through the Cold secondary side of the circuit, so more likely you will have more damaged parts in the power supply and the main board.

Bud the pdf you attached is of the burned component on the backside?

reason i ask is because the electronics guy at work removed it for me today and it doesnt look like the one in the pdf

the one i removed is a surface mount with only 3 legs

i attached a pic of it removed

[budm]

Re: samsung UN22D5010 no power

Yes, the SMD ref diode has 3 legs, something like TL431.

[jose6326]

Re: samsung UN22D5010 no power

Yes, the SMD ref diode has 3 legs, something like TL431.

Bud i already replaced the IC under the heat sink
i replaced it with a ICE3A1065ELJ ( pdf is attached in previos posts)
Tom confirmed i can use this one since the original had a lead time of 12 weeks and a minumum quantity of 1200pcs


how do i figure out which diode i need on the back side of the board which you said might be a TL431?

[capkid]

Re: samsung UN22D5010 no power

Ideally, you can look up the part numbers in most Samsung power supply service manuals. There don't appear to be any free service manuals available for this TV. I keep seeing "KA431" for other Samsung power supplies when I do a search by "ICM851 Samsung"; I've always understood KA431 to be the same as TL431.

[jose6326]

Re: samsung UN22D5010 no power

im on the digikey website and there are several TL431

which one should i get?


also should i replace the start up cap and the fusible resistor?

i want to make sure i order all the components at one time

[capkid]

Re: samsung UN22D5010 no power

This appears to be a good replacement: http://www.digikey.com/product-detai...64-1-ND/863961

Bud will know better than I would. It looks like your resistor is ok, but I might consider replacing it. I couldn't see the bands' colors well in your pic, but another pic online shows them as yellow, black, silver, and gold: 0.4 ohms 5% tolerance. It wouldn't hurt to replace the cap; most will recommend Panasonic FM, FC, or FR series caps.

[jose6326]

Re: samsung UN22D5010 no power

yes you are correct on the resistor

i will order the cap and resistor

what about the chip on PC801S?
should i replace that as well?


digikey does not carry the resistor

[capkid]

Re: samsung UN22D5010 no power

I doubt that PC801S is faulty. I'd just replace the resistor, cap, and ICM851.

[jose6326]

Re: samsung UN22D5010 no power

I doubt that PC801S is faulty. I'd just replace the resistor, cap, and ICM851.

digikey and mouser do not have the resistor

i will order the rest and continue to search for the resistor

[capkid]

Re: samsung UN22D5010 no power

digikey and mouser do not have the resistor

i will order the rest and continue to search for the resistor

The resistor may be ok, but I'd feel more comfortable replacing it.

[jose6326]

Re: samsung UN22D5010 no power

Im waiting on parts from digikey

What should I check on the main board?

[budm]

Re: samsung UN22D5010 no power

OK, the opto's iNternal LED (the black 4-pin device) is connected in series with the ref diode, so if the ref diode blew up, then, the opto is more likely to be damaged also.

[jose6326]

Re: samsung UN22D5010 no power

OK, the opto's iNternal LED (the black 4-pin device) is connected in series with the ref diode, so if the ref diode blew up, then, the opto is more likely to be damaged also.

Can you point this out for me on the pic?
Is this on the psu or main board?

[budm]

Re: samsung UN22D5010 no power

PC801S close to that burnt component ICM851, you can see that in the app notes diagram I have shown also.

[jose6326]

Re: samsung UN22D5010 no power

You are talking about the opto labeled "30C"

Should I order an extra one to replace the one above it (RM863)

[budm]

Re: samsung UN22D5010 no power

This one https://www.badcaps.net/forum/attach...2&d=1376019195

[jose6326]

Re: samsung UN22D5010 no power

I was going to order that but Capkid said it was probably still good

I will order it