Samsung LE26A457C1D Power problem, It Banged

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Just out of poking around i poped out resister RX801S and tested it and the meter didnt read anything from it either way around :/

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

They can, there's also usually a MOV which can fail short, it is surge protector.

Wonders what the MOV is

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

They can, there's also usually a MOV which can fail short, it is surge protector.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

My soldering iron resembles that of a iron thats used to stamp burns into the ass of a cow, and if i remove it again the board around the bridge might be destroyed beyond repair so im a bit scared to take it out unless its the only way

it only blew the 5 am fuse in the plug this time and not the one on board, i was looking and forgive me i dont know what some of them are but if the green thing above power connector or resistor or the white box marked 330n K things that connect straight after fuse line between live and negative, do they fail often and allow current to short out?

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

If you power it up without the bridge installed does the fuse still blow?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

And thats the underside

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Ok so ive taked the bridge out and tested it and its fine, however it still blew the fuse. I then started testing all the diodes so i disconnected them all and checked all of them and all again seem fine :/

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Thinking the same thing, good job I ordered 2 now when I turn it around , I Will be edging away from the plug socket as I knock it in with a brush pole expecting a loud bang lol

[selldoor]

Re: Samsung LE26A457C1D Power problem, It Banged

Better test it again when you take it out, in case you have cocked sorry cooked it.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Yep thats the fuse blowing, including the one in plug lead

I thought about the light bulb but its something i couldnt get my head around and the shop round here only sells some nasty looking things that look like there made for offices and mine are led :/

T rectifier oh cock! its in wrong way round! i put it in writing facing forwards instead of cut corner to the left lmao! Hangs head in shame!

I will turn it around in a couple of hours when i get back and let you know

Thanks for that :P i feel a right Noob now

[selldoor]

Re: Samsung LE26A457C1D Power problem, It Banged

You could start checking for full shorts. on all the big components. Perhaps start with the
3 diodes at the end of the board furthest from the mains socket.
I would still consider making up a light bulb.
You did get the bridge in the right way round? and test it again.
Perhaps a clear picture of the back of the board would help us

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Great. Got it


So it is FP801S that is blowing? (6.3AH)

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Bn44-00214a

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Is there a BN44-###### number printed on the power board? To look up schematic.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Nothing at all, it blws the slow blow 6.3 everytime

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Any standby output from power supply?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Okay, new parts have come, new bridge rectifier and little blue cap along with a bunch of new fuses.

Fitted them all in well and gave it a whirl, standing well back expecting another bang pop fizzle, and nothing happened, so i checked for current and theres no power coming in, suspecting blown fuse in plug i changed it and still nothing, checked the fuses and all had blown again. So i checked the soldering and lines for making sure theres nothing shorted out and all is clear and im stuck what i should check next

Any ideas for me?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

TO-220 - from main input connector diagonally to the right - just above the blue cap.

EDIT how about this?

http://cpc.farnell.com/murata/debf33...age/dp/CA05022

Yes! I saw this the other day while looking a bit more in depth i just passed on it thinking maybe its different for saying 1000v instead of 1kv when they are both the same thing :/

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

The 2.2nf cap is the blue rectangular cap? the one with burnt glue is the blue ceramic high voltage cap to the left of the heat sink on the bottom right of the board.

Looks fine that one it was just covered in glue lol The one i thought you were talking of is the lil blue disc cap just underneath the big cap

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Ohhhh i was looking at that but all i got on that is QB802 and on the sheet it says 80v 4A thats proberbly why i didnt understand. Im not up on component names without a bit of lookin up sorry but thanks