Baird X47DTV power supply issues

[gilly1984]

Re: Baird X47DTV power supply issues

Also, come to oldham and give me a slap for this one,,, But can i not use any psu as its only powering the inverter, and the only other wire going to it is the ps-on. I understand it would need to have 6A on the 24v rail. And aslong as it fits of course, could always mod it.

I only ask because these psus are like rocking horse shit.

[tom66]

Re: Baird X47DTV power supply issues

You need more than 6A on 24V to run the whole display.

A 47" will want some 10A or so.

The reason it's cutting out is as the bulbs warm up they draw more current. So when the TV is cold it can start on just 6A, and then begins to exceed the current limit of the main supply causing it to flicker then go out.

[tom66]

Re: Baird X47DTV power supply issues

That's not an LG main board, it's some cheapie main board - it's probably just marked for being compatible with an LG panel.

I dunno about parts, I think you're pretty close to fixing it. I'd offer to do it myself, but I have no soldering equipment in my dorm at the moment. Do you have a hackspace nearby? Or a TV technician who'd charge £10-15 to install the IC?

[gilly1984]

Re: Baird X47DTV power supply issues

It has 2 psu, each marked with the voltages and the amps it provides, each psu supplies 6 amps to the 24v rail, 1 psu is workin so i was thinking about just sticking another psu in place of the slave psu, so the working psu is supplying the left inverter and the misc psu powers the right inverter.

Bummer about the main board then. The sneaky gits.

Not looked for a technician round here, Getting the parts and getting him to fit the ic will cost more than a psu. Plus there could be more wrong with it.

Also, just blew up my second cheapo DMM
No more cheapies for me!

Why the hell did i strip that vestel psu for parts

[tom66]

Re: Baird X47DTV power supply issues

You need 12A on your 24V rail then. Hungry beast!

What other power supply do you have? I thought this TV had just two PSUs and one was broken.

If you are thinking of using a Vestel PSU, I would advise against it, as they have very poor reliability.

[gilly1984]

Re: Baird X47DTV power supply issues

I have no other psus so far but they are much easier to get hold of.

Yh, i have 2 psu, 1 working, 1 broken. The working one says

(1): 5V 0.8A (2): 12V 3A
(3): 16.5V 2A (4) 24V 6A

I know i'm probably missing something but where do you get 24A if each psu only gives out 6A making a total of 12A between the 2?

The slap is still on offer.

[tom66]

Re: Baird X47DTV power supply issues

You need 12A in total on your 24V rail. Or does each PSU only power one inverter?

[gilly1984]

Re: Baird X47DTV power supply issues

You need 12A in total on your 24V rail. Or does each PSU only power one inverter?

Lol, yes, each psu has a socket for each inverter. Then the main psu powers the rest of the tv. The slave psu only has an inverter and 1 red single wire which is ps-on signal.

Master and slave psus are identical.

When i first got the tv the main was blown so i have put what was once the slave into the place where the master was. I have managed to get the tv on, but using just the master to power eveything, Both inverters. (With the help ov a bit of wiring.

Hope that makes it clearer.

[tom66]

Re: Baird X47DTV power supply issues

OK, then you should be able to use any substitute PSU you like if you can wire the PS-ON together.
Go down to your local tip and pick up a victim of a Wii remote?

[gilly1984]

Re: Baird X47DTV power supply issues

OK, then you should be able to use any substitute PSU you like if you can wire the PS-ON together.
Go down to your local tip and pick up a victim of a Wii remote?

they have stacks of TVs in out tip. are you allowed to take them?

[tom66]

Re: Baird X47DTV power supply issues

If you ask and they say OK.

They usually want £10 for a smashed screen where I am. Try for a 42" screen from a no-name make. Don't pick up a big screen Sammy, LG or Panasonic as the inverter will be on the PSU.

[gilly1984]

Re: Baird X47DTV power supply issues

Will ring them tomorrow. Didnt think you could do that now that they are all run by viridor.

I may even take the psu out of the bedroom tv to see if it will actually work. Vestel 22" (alba)

[tom66]

Re: Baird X47DTV power supply issues

Will ring them tomorrow. Didnt think you could do that now that they are all run by viridor.

Ask the staff directly if they're not too far.

It is usually all official, with the purchase being logged and the money kept by the council.

Some places don't allow it any more. One nearby me used to, I got two TVs with bad caps from them, easy fixes, but then they said no more.

[gilly1984]

Re: Baird X47DTV power supply issues

Need a 420v 180uf cap, needs to be a radial with legs (not snap in)

Been looking on digikey but couldnt find one, any chance of some help. Would prefer it from digikey as i am getting a few parts from there.

Its 50cm long 18cm wide.

Thanks.

[tom66]

Re: Baird X47DTV power supply issues

You can use a 450V 180uF and probably 450V 220uF, does that make it easier?

[tom66]

Re: Baird X47DTV power supply issues

Oh, and don't forget. When your items arrive, Royal Mail will add £8 plus 20% VAT. Digikey shipping is likely going to be another £8.

[gilly1984]

Re: Baird X47DTV power supply issues

Oh, and don't forget. When your items arrive, Royal Mail will add £8 plus 20% VAT. Digikey shipping is likely going to be another £8.

Then i refuse to shop there. That is a joke!

[tom66]

Re: Baird X47DTV power supply issues

Then i refuse to shop there. That is a joke!

Yeah and somehow there's no VAT for purchases from Hong Kong and China - how do they get away with it?

[gilly1984]

Re: Baird X47DTV power supply issues

Yeah and somehow there's no VAT for purchases from Hong Kong and China - how do they get away with it?

Any other UK places? With much cheaper shipping. Ebay prices are high for the same components.

[tom66]

Re: Baird X47DTV power supply issues

Where can you buy the controller IC?

You can get the rest from Farnell, RS, etc.