samsung UN22D5010 no power

[jose6326]

I just bought a 22" samsung from craigslist

The person I bought it from said that 2 of his tv's went out during a storm
So he got his 42 inch fixed said it was a board but didn't know which one since a tech came out and fixed it
He didn't want to spend anymore money fixing the 22inch

So im hoping it is only a power board issue and not a fried panel

So as of now there is no power at all
I plugged it in and there is no led to indicate power

As I suspected there is a blown fuse on the ps
There are no visible blown caps
Should I replace the caps?

There are some burn marks on one of the resistors and 2 diodes

I did check these with my ohm meter and I am getting readings but im not sure how to test these

So how do I test these before I replace them or should I just replace them?

Thanks

[tom66]

Re: samsung UN22D5010 no power

I'd check the power supply for shorted FETs.

[jose6326]

Re: samsung UN22D5010 no power

How do I test these?

Do I just ohm them out?
What kind of reading should I get?

[tom66]

Re: samsung UN22D5010 no power

Yep -- just measure all three combinations 1-2, 2-3 and 3-1 (arbitrary numbering; but be consistent with each device.) A reading below 30 on diode test, or below 100 ohms is indicative of a potentially failed device. Suspect devices should then be removed and tested out of circuit to verify if they are actually failed.

[jose6326]

Re: samsung UN22D5010 no power

tom i brought the board to work with me to show the electronics guy

he says he does not see any fets on this board
but he did say what the problem is

he found a burned chip under the heat sink
see pics

he said more then likely this is what took the hit and he is almost positive the other parts should be ok

only problem is it is hard to identify the chip

see pics

we were able to get some numbers off the chip that melted to the heat sink
asterisk indicates possible missing characters

**RU665JZ
***1051L0P
***11046X01

[jose6326]

Re: samsung UN22D5010 no power

He did say its possible the chip on the underside of the board could possibly be bad since it is between the burned chip

[tom66]

Re: samsung UN22D5010 no power

That is probably your problem. Those devices contain an internal power FET. It looks to me like you'd only need to replace that device as it is an all in one power switcher. The part number is burned to the heatsink -- you'll need that.

[jose6326]

Re: samsung UN22D5010 no power

tom can you help me identify the chip?

what kind of chip is it?

i provided the numbers we were able to read above

[tom66]

Re: samsung UN22D5010 no power

I can't find that part unfortunately.

[jose6326]

Re: samsung UN22D5010 no power

do you know what kind of chip it is?

[budm]

Re: samsung UN22D5010 no power

I have seen this SMPS IC before, ICE3BR0665JZ
Verify that the snubber network is OK also.

[jose6326]

Re: samsung UN22D5010 no power

thanks for the help budm

i actually put the burned part back on and i was able to read the rest of the numbers
which is what you said BR0665JZ

where can i buy this?

how do i check the snubber network?

[jose6326]

Re: samsung UN22D5010 no power

i tried Digikey but it has no results found

they do have other Infineon offline IC but not this exact one

i will keep searching

thanks again

[tom66]

Re: samsung UN22D5010 no power

ebay is your friend, sometimes:-
http://www.ebay.co.uk/itm/ICE3BR0665...item27d4e5001a

Need to confirm with seller 7/8 pin version though I -believe- you can just chop off the extra pin if present as it has no function (only high voltage isolation on version without it.)

[jose6326]

Re: samsung UN22D5010 no power

tom

thanks for the help

i actually found this same one using the U.S. ebay website
they have the same one you provided a link to coming from china

but it is not the same IC i need
the ones i found are all 8 pin and is missing the "Z" at the end of the part number

the one i need is a 7 pin also the original IC has something called Extended blanking and auto-restart.
i have found a similar IC with 8 pin but it has Blanking and latch
not sure if this makes a difference but i am still reading the specs on both and trying to determine if it will affect operation.

but you are right the number 6pin on the 8 pin IC can be removed since it is not used.


im wondering what would happen if i buy this and install it on the board?

but i will keep looking

thanks again

[tom66]

Re: samsung UN22D5010 no power

I compared datasheets, on the non "Z" version with 8 pins, the 6th pin (additional pin) has no function (non-connected) and can be cut off safely to convert the chip into a 7 pin version.

[jose6326]

Re: samsung UN22D5010 no power

does the non "Z" version have extended blanking and auto restart as i mentioned above?

i was comparing the data sheet i attached to the one Budm provided

[tom66]

Re: samsung UN22D5010 no power

It doesn't, but I can't see any issue from having those features. Auto restart will recover from short circuit automatically, and I think extended blanking saves some extra power in standby.

[jose6326]

Re: samsung UN22D5010 no power

tom check the pdf i attached will that work as well?

i will take a chance and order the one from ebay


thanks tom

[tom66]

Re: samsung UN22D5010 no power

Which chip is that, Z version or not?