Samsung 245bw No Power No LED

[Ober]

Re: Samsung 245bw No Power No LED

Did the DCV 20 test on the 450v Cap mean its still good? (starting with a lil charge and going to nothing?)



Edit: Rest of my questions were just answered above as i posted.. thx

[Ober]

Re: Samsung 245bw No Power No LED

Selldoor> not a single reading on those (im assuming by mains you mean 450v cap)

Note: im still working with JUST the power board, all ribbons still apart..

[Rtech]

Re: Samsung 245bw No Power No LED

Selldoor> not a single reading on those (im assuming by mains you mean 450v cap)

Note: im still working with JUST the power board, all ribbons still apart..

NO...he means the mains socket where the AC comes in

[selldoor]

Re: Samsung 245bw No Power No LED

Did the DCV 20 test on the 450v Cap mean its still good? (starting with a lil charge and going to nothing?)

It is not really a valid test so doesnt mean its good or bad.

[selldoor]

Re: Samsung 245bw No Power No LED

Selldoor> not a single reading on those (im assuming by mains you mean 450v cap)

Note: im still working with JUST the power board, all ribbons still apart..

Yes first four from mains socket to bridge
last two from bridge to Main/Big cap (450v)


When you say not a single reading do you mean the meter stays on "1"
or the meter goes to 0.00


Yes I know you are just on the power board - that is ok.


Are you up for testing for a mains voltage (400vdc perhaps) at the big cap?
If you have any sort of RCD socket (Residual-current device) then use that.

Again just try it with only the power supply - nothing connected to it.
Make it a short test and unplug straight after but remember not to touch the board for some time after.
If so, meter on 1000vDC Red probe to positive pin and black probe to
negative pin of the Big cap.

[Ober]

Re: Samsung 245bw No Power No LED

ahh oops, thanks..

Mains socket is labeled N and L

Black on N, Red on 2 - 1L
Black on N, Red on 3 - Starts high and very very quckly drops to 001
Black on L, Red on 2 - 1L
Black on L, Red on 3 - 1L

Bridge-Cap Tests - 1L

No reading meaning 1L (sorry for using two things to describe the same)

[Ober]

Re: Samsung 245bw No Power No LED

1000 DCV -- Black on Neg, Red on Pos - Plugged in, Power Switch On - Started higher (not sure exactly where) dropped to 168, 2nd try again just 168

[selldoor]

Re: Samsung 245bw No Power No LED

Well that is great - can barely believe it Ive just typed in that there doesnt seem to be any connection between mains and big cap but
clearly there is.
Well done - tests should get easier from now on. perhaps someone will take over as I am off to bed.

[selldoor]

Re: Samsung 245bw No Power No LED

Just check that your probes are plugged firmly into the meter and that the wires to the probes are ok - I used to have one of those and the wire kept pullng off the pin inside the handle.

[Ober]

Re: Samsung 245bw No Power No LED

So what might i try next?
..Thanks

[selldoor]

Re: Samsung 245bw No Power No LED

Ok - nobody playing? Next is still no luck with camera? how about a scanner?

Meter on Ohms - Power off- remember the arrow pointing to the bridge? , well follow that and just past the bridge you might find a little red rectangular box.
If you do it is a fuse, I think what does it say on it?
find its pins on the bottom of the board and test it.

[rogfanther]

Re: Samsung 245bw No Power No LED

Ober, which are the codes in the PSU board ? Most are IP-xxxxx , but can be BNU-xxxx , or other ones. Please, post them and maybe someone can fina a photo to help us help you.

[Rtech]

Re: Samsung 245bw No Power No LED

Just looked for a photo, and is this not a 68Ω resistor fault ?

[Rtech]

Re: Samsung 245bw No Power No LED

OBer, does your board look like the middle photo on this page ..

https://www.badcaps.net/forum/showth...ighlight=245bw

[selldoor]

Re: Samsung 245bw No Power No LED

Ober, which are the codes in the PSU board ? Most are IP-xxxxx , but can be BNU-xxxx , or other ones. Please, post them and maybe someone can fina a photo to help us help you.

See post 18?

[Rtech]

Re: Samsung 245bw No Power No LED

It is the same as the one I have referred to in post 54.

[selldoor]

Re: Samsung 245bw No Power No LED

Just looked for a photo, and is this not a 68Ω resistor fault ?

See post 5?

[Rtech]

Re: Samsung 245bw No Power No LED

See post 5?

I just hate going back and fwd all the time.

[Ober]

Re: Samsung 245bw No Power No LED

hehe, well yes that seems to be the exact same board...

[Ober]

Re: Samsung 245bw No Power No LED

Tested FB802S (Red Fuse Box) 200ohms -- started high dropped to 0.6