Baird JO37BAIRD(A) No Power

[Mikeyboy2007]

ok so a friend dropped off a tv today for me to have a look at, he said he was sitting and he heard a loud pop come from it and the thing went dead, iv popped the back off had a look, caps look fine, nothing looks burnt out or even remotely damaged, any ideas

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

heres a couple of pictures if it helps, get no red standby light or anything just completly dead, there is a power switch on the back switched on and off, changed power lead to make sure its not something daft like a blown fuse or anything... ideas please

[tom66]

Re: Baird JO37BAIRD(A) No Power

Check the voltage across the capacitor in this picture marked with the green "ROHS 2002/95/EC" sticker, top right.
https://www.badcaps.net/forum/attach...2&d=1363021788

Careful -- may be up to 400V.

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

how do i do that mate, ive got a multimeter but still trying to figure out how to use it to measure voltages, do i need the tv powered on to do that ?

[tom66]

Re: Baird JO37BAIRD(A) No Power

TV on, all plugged in.
Red lead in Volt/Ohm, black probe in COM.
600V DC range (or higher.)
Report reading.
Be very careful not to touch the probes together.

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

i know how much of a dumbass you probably think i am right now lol but is this at the right setting ? thanks for help

[vinceroger69]

Re: Baird JO37BAIRD(A) No Power

the capacitor has a positive and negative leads also so make sure you get this right imo you can see the negative markings on the side of the capacitor.(not sure if this makes a difference when testing voltage tom66 will advise).

[vinceroger69]

Re: Baird JO37BAIRD(A) No Power

dc volts http://www.google.co.uk/imgres?imgur...QEwAw&dur=4992

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

thanks i woulda been doing the wrong thing lol... i got the reading of 328-330 if thats any help thanks

[tom66]

Re: Baird JO37BAIRD(A) No Power

That's about right. So, check all the voltages along these connectors:
https://www.badcaps.net/forum/attach...4&d=1363021788

along with the voltage label written next to it.

[vinceroger69]

Re: Baird JO37BAIRD(A) No Power

in pic 4 the white plugs does it say any voltage readings by them?
black multimeter lead to a mounting screw by the white plugs then push red lead down the side of each wire in the white plugs then take readings.

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

sorry Tom66 how would i go about doing that ? and Vinceroger 69 i attached a picture for you, if you need the voltages written let me know

[tom66]

Re: Baird JO37BAIRD(A) No Power

Black probe on frame, red probe on each successive pin, meter on 200VDC. Record and post each measurement next to how it is labelled.

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

ok i put the black probe on the metal chassis and the red probe on each pin but there all reporting back 0V, got multimeter set to 200v DC

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

only 1 pin is reporting back 1.7V

[vinceroger69]

Re: Baird JO37BAIRD(A) No Power

does the underside of the power board look ok no obvious burn marks heat damage etc?

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

any ideas ?

[tom66]

Re: Baird JO37BAIRD(A) No Power

Which pin is @1.7V? Label?

[Mikeyboy2007]

Re: Baird JO37BAIRD(A) No Power

circled the pin mate, thanks

[tom66]

Re: Baird JO37BAIRD(A) No Power

Are you sure it is not 5VSB?