Burned IC Identification

[ek2oo2]

Could anyone please help me to identify U101, the 8-pin IC located on the lower part of the image?

Been searching for ages on the net...

here's a little info

POWER INVERTER PCB AI-0065 REV:J E0420846G from DELL E152FPg LCD MONITOR

Thanks and I'll appreciate the help..

Eugene

[budm]

Re: Burned IC Identification

What are the numbers as printed on the top of the IC?

[ek2oo2]

Re: Burned IC Identification

the top IC as almost readable, here it is:

9971D
347263

according to Ebay seller:

AP9971D 9971D N-CHANNEL POWER MOSFET DIP8 IC

[jetadm123]

Re: Burned IC Identification

I think budm meant what does the lettering on the top of U101 say?

[ek2oo2]

Re: Burned IC Identification

hi.. It was badly burned (u101), I don't have the actual board, i left it in the province where I do home servicing and I don't have a digicam with me..

[budm]

Re: Burned IC Identification

OK, so that is not the picture of your board then?

[ek2oo2]

Re: Burned IC Identification

Yes, it is a reference picture. This board matches exactly with the one that got burned.

[selldoor]

Re: Burned IC Identification

hey ! I just love a puzzle - this is a good one where neither the puzzler nor the the solver have full access to the problem.

I am timing the post of this in the hope that budm sees it and can say if it is likely to be a correct guess, using his great circuit knowledge.

Anyway working on what information we have it is a AI-0065 REV:J

If one googles this then select "images" you can see a few boards that are still not legible.
BUT if you click on the 3rd one (well it is the 3rd one on mine)
this one: http://www.google.co.uk/url?sa=i&rct...86165578212795

You still cant see the IC

BUT when you do that single click, it enlarges slightly and at the side there are 8 small pics. Second one in - top row is the one to look at:
http://www.google.co.uk/url?sa=i&rct...86165578212795

I hope these long links work - that is why I am doing the story in case they dont .

Golly that cap next to it looks a mess - ek2oo2 better check yours - it going could be what blew the IC.

Anyway I can make out 365 and have enlarged it , turned it and inverted the colours and get the attached . On which I can make out / 0365R and the date code underneath. Substituting letters I come up with M0365R and as it is a dip8package think it is a 5M0365R.

Datasheet: http://www.alldatasheet.com/datashee...A5M0365RN.html

If budm thinks that is correct they are on ebay

http://i.ebayimg.com/00/$(KGrHqYOKm8E4TU7BR8FBOQ8!7EcSQ~~0_26.JPG?set_id=8800005007 and available to the Phillipines

http://www.ebay.co.uk/itm/1110601984...%3AMEBIDX%3AIT

[ek2oo2]

Re: Burned IC Identification

Amazing..

Second one in - top row is the one to look at:

This one's a killer, it enlarges a bit and shows "0365" on top of the IC which is better even when the colors are inverted. Those digits were enough to complete the search.

I'm sure I've been passed through all this pages but I'm surely did missed this one :P

Special thanks goes to selldoor for bringing up the links that actually solve this.

I'm going to our local electronics store to see if this available and I'm going to replace that burned IC and check everything (and that cap too) before firing it up.

Thanks for the replies guys and I guess this thread is done..

[budm]

Re: Burned IC Identification

I can tell if that SMP IC is the correct one or not if i can see the bottom side of the board to see how the pins are connected to the transformer, VCC, GND, etc.
You should check the snubber network circuit: D101, C102, and the resistor sitting vertically to make sure they are OK, if the snubber failed it could be the reason the IC is damaged.
@selldoor, you are amazing!

[ek2oo2]

Re: Burned IC Identification

Hello there, just an update...

I bought the IC (DM0365R) from our local electronic shop, luckily they have one available and sells one for about 80 pesos. Prior to this, I picked up the unit from the province and managed to get it home so that I could focus.

Desoldered the burned IC and replace it with a new one, also replaced the blown main fuse (3.15A) and checked the whole power board but not thoroughly. Mostly continuity and resistance reading from the Mains to Inverter path.

I did not find any discrepancies at all, especially the diodes, which I expected at least one of them to become shorted. Double-checked.. Still nothing irregular, that made me decide to power it up.

The green led glows, the backlight is even and the cable prompt box started to dance. I let it on for awhile without any signal applied at the VGA port and so far it is idle warm..

And yes of course, the part number is correct, what made me think more is why the IC got burned. My early conclusion is that maybe the IC died on it's own or got shocked from a power surge which is very common in our tropical island, storm lightning for example. Lastly, in my opinion, they could have somehow not used the 8-pin package for a power IC because they don't have it heatsinked. He might have died of overheating as well. But I'm not an expert just using the little logic left in my brain :P

Meanwhile, the burn-in continues...

[ek2oo2]

Re: Burned IC Identification

to budm,

I did check the circuit you have mentioned and looks good in my small multimeter. What does the snubber really do? Is it some kind of a barrier or more of a "shock absorber" ? The term snubber sounds "someone who ignores".. am I right?

[Lumberjack777]

Re: Burned IC Identification

Lastly, in my opinion, they could have somehow not used the 8-pin package for a power IC because they don't have it heatsinked. He might have died of overheating as well.

Congratulations on the fix! You might consider adding a heat seak to help prevent it from burning out again. Here's a few examples. http://www.ebay.com/bhp/ic-heatsink