Samsung LE26A457C1D Power problem, It Banged

[vinceroger69]

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 :/

can you post a picture or what colour bands has this got?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

can you post a picture or what colour bands has this got?

Black Light Green Yellow Darker Green Purple

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Across the PADS on the board, what do you measure (2000 ohms) across + and -. Note: Bridge out of circuit. You are testing board only.
Hold reading for 10 seconds before recording it to allow it to stabilise.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Nothing at all It doesnt even change on the meters

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Sorry i misread you, i thought you ment read from the power cable connector, it went up a little and settled down to 001

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Across the PADS on the board, what do you measure (2000 ohms) across + and -. Note: Bridge out of circuit. You are testing board only.
Hold reading for 10 seconds before recording it to allow it to stabilise.

Am i doing this with the power on or off btw?

[vinceroger69]

Re: Samsung LE26A457C1D Power problem, It Banged

off im not sure on the resistor colours maybe someone else will confirm for you.

[selldoor]

Re: Samsung LE26A457C1D Power problem, It Banged

unlikely colour combination see here
http://www.hobby-hour.com/electronic...calculator.php

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Show us where you are probing please, do it from the bottom of the board ideally, are you saying you see zero, or the same reading your meter shows when probes are not touching?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

unlikely colour combination see here
http://www.hobby-hour.com/electronic...calculator.php

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

That resistor would probably not cause your issue, especially if the fuse isn't blowing with bridge removed.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

Show us where you are probing please, do it from the bottom of the board ideally, are you saying you see zero, or the same reading your meter shows when probes are not touching?

Im doing it from the bottom of the board where the bridge was from the possitive and negative points

I just did it again , the meter just says 1 when im not using it i did it again and it went to 000 after about 10 seconds

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

So it is holding at 000? You have a short after the bridge rectifier then.

[selldoor]

Re: Samsung LE26A457C1D Power problem, It Banged

best guess on the resistor is violet green yellow gold black

750kohms based on 4 rings

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

So it is holding at 000? You have a short after the bridge rectifier then.

I checked all the diodes on the top of the board, what things can short out?

I begining to think this is a dustbin piece, although the £69 price tag on ebay is annoying me

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Sounds about right - only purpose of that is to discharge the CX### capacitor next to it - it's a safety thing to avoid a shock from that.

[vinceroger69]

Re: Samsung LE26A457C1D Power problem, It Banged

did you check the two transistors on the top and middle heat sinks?

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

did you check the two transistors on the top and middle heat sinks?

Nope, not sure how to check them realy, theyhave to be taken out to test?

[tom66]

Re: Samsung LE26A457C1D Power problem, It Banged

Ideally, yes. Then check on 2000 ohms between each pair of legs both forwards and backwards.

[aar5384]

Re: Samsung LE26A457C1D Power problem, It Banged

DP802 has reading of 495 with + on left leg no reading other way round

QP801S