Toshiba 24d1334b2....vestel!!

[budm]

Re: Toshiba 24d1334b2....vestel!!

https://www.badcaps.net/forum/attach...3&d=1413835992
OK, there are four red circle in the LF1 box I marked, what resistance do you get between the two top circles, and between the two bottom circles? Are you sure that the legs of the LF1 are making contact with the copper pads and no breaks in the solder pads? Hard to believe that both coils are open, you can see the coil symbol printed on the circuit board.

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Budm,

I have just removed LF1 and double checked both coils are Open Circuit. On closer inspection you can see "blackening" under/inside the coil of the lower coils, look at the bottom corner around 5 oclock. I have tried to get pic as close as I can, the top coil looks OK.

Ignore the defined black mark on the top coil that was so I put it back in the correct orientation.

Something must have happened to the coil as per the other pic I have reattached showing inside the rear cover, looks like something went bang!

[tom66]

Re: Toshiba 24d1334b2....vestel!!

So the mark is directly below it?
You could rewind the coil but it's probably not worth it. You would need some magnet wire, a steady hand and good patience.

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi, The mark is directly behind LF1 on the inside of the rear cover. So looks to be it went bang! can you buy LF1?

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Or would it be better to buy a new PCB?

[budm]

Re: Toshiba 24d1334b2....vestel!!

You can jump the choke for now to verify that the TV is still functioning, the choke is required for the compliance to pass the conductive noise test.

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Budm,

Good idea just linked the two sets with some wire and still dead so I guess there is more to this that first thought. Wonder if worth checking out voltages etc, or just get new PCB?

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Budm,

Scrub that! the TV come on I had not quite soldered one hole properly. so thank you sooo much Budm for the idea. I guess I should replace it? if so do you know where I can get one from?

Thank you again

[budm]

Re: Toshiba 24d1334b2....vestel!!

You have to search for TOROIDAL COMMON MODE CHOKE, you will need to find the inductance rating, the current rating is probably 2~3 A range. You may be able to go by the dimension. Do you have any access to electronics recycle places?

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Budm,

OK I will search ebay, RS online and CPC etc. to find it, just out of interest what would happen if I leave it out?

When you say electronics recycling places, do you mean the companies who strip down TV's and sell the parts?

[budm]

Re: Toshiba 24d1334b2....vestel!!

Nothing, its purpose is to filter out the noise from the switching power supply from injecting noise back into the power line, at the same time it also reduces the noise form the AC line from injecting into the TV POWER SUPPLY.

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi, I Purchased a new PSU with intention of removing the coil and fitting to my PSU, the PSU I purchased was not the same version and was laid out different, stupidly I just forgot what I was doing and fitted the new PSU switched the set on and had sound and a black screen! I realised thinking maybe a different version would not light the screen so I removed it from the TV removed the coils and fitted to original PSU fitted it and I have the same! sound and no picture! help!! is it likely to have blown the main PCB? or damaged the panel?

Thank you guys

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Guys, Have I missed something? or have I killed the main PCB?

[tom66]

Re: Toshiba 24d1334b2....vestel!!

Do you have a backlight on the screen?

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

No back light

[tom66]

Re: Toshiba 24d1334b2....vestel!!

Check the supply to the backlight inverter or LED strip. Check cables firmly and securely seated. Since you have sound main board probably working (not guaranteed but good chance)

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Tom,

I have removed and refitted the ribbon cable from the main PCB to the top of the screen. I have checked the fuse on small PCB next to the PSU.

Can you help with where and what I am expecting to test the backlight inverter/LED strip please.

[Andyd1970]

Re: Toshiba 24d1334b2....vestel!!

Hi Tom, Do you think its worth repairing? happy to test some voltages etc but not sure where to start to check main PCB/back lights etc.

[tom66]

Re: Toshiba 24d1334b2....vestel!!

I don't really do that many LED TV repairs so can't suggest much beyond obvious testing of fuses and power supply outputs.

[budm]

Re: Toshiba 24d1334b2....vestel!!

OK, so what DC voltages do you have on those 4 caps close to the LED driver black connector?
Can I also see the pictures of all the boards to see how they are all connected together?