Is this a diode? picture attached

zBuff · 9th September 2006, 05:09 AM

Our TV, gave up the ghost and stopped working, and some magic smoke came out of it. I opened it up and found that this component must have been the culprit, problem is I don't know what it is or what value it would be. It had a DL#### on the circuit board that would indicate it would a diode correct? I've just never seen one like that before. it has 010020 written down one side of it.

Worth replacing?

rpapps · 9th September 2006, 05:17 AM

Hi zBuff
DL usually signifies delay line although I'll admit I haven't seen one like that before. They usually don't release smoke.
What makes you think it's the culprit?
Cheers
Rob

zBuff · 9th September 2006, 05:25 AM

Thanks for the quick reply Rob.
So far it's the only component that I can see that has any signs of rupture or carbon deposits. Not too sure if the picture is clear enough to see it, but the metal is distorted (bent up) on the bottom left hand corner and the colouring seems a bit odd to me(not that I know what the usual colouring should be, due to my unfamiliarity with that type of component).

unmibh · 9th September 2006, 05:46 AM

zBuff,

that's defenitely not a diode.

it's more like a variable inductor, inside that metal shell would be
a plastic bobbin with insulated copper wire and the ferrite in the middle is a screw and with every turn changes the inductance.

I you have a diagram this will be a symbol of a transformer with a diagonal arrow across it to indicate variable.

I hope this help.

unmibh

rpapps · 9th September 2006, 05:47 AM

No, I can't see the effects you mention in the image.
If it's a luminance delay line, as I suspect, it's basically just a coil and you should be able to measure it for continuity.
Of course this means accessing the solder side of the board so be real careful that it's been switched off for a while and the mains plug is pulled.
If it has died you should still be seeing something on-screen and hearing sound.
If the set is totally dead then I think the fault lies elsewhere.
Cheers
Rob

poobah · 9th September 2006, 05:54 AM

That is an inductor or a transformer... for high freqs... like 100 K to 1 mHz. Most likely it is NOT your problem.

TV's are dangerous as hell... stay away from the picture tube and ANYTHING hooked to it.

zBuff · 9th September 2006, 06:23 AM

The TV has been unplug for over a couple of months so I'm guessing it should be reasonably safe.

The TV still did turn on but it was a black screen with a bit of a white squiggle down the bottom if I remember correctly. What kind of sound should I be hearing?

It test ok for continuity, assuming I was measuring the right points on the underside, I could unsolder it to double check.

Are these things normally suppose to be variable? the centre core is actually raised above the metal casing. Is there anyway to check what value is need?

If you click on the picture it should show it zoomed in a fair bit. If that's not clear enough I could take a better picture tomorrow when I have better light.

poobah · 9th September 2006, 06:41 AM

I have a sad story about a TV... too long to tell. Buy a new one.

My BEST advice.... really.

Read the forum rules... no TV here.

My short story:
I got divorced.
I had nothing.
I bought TV.
It worked for 8 Years.
It broke.
I fixed it.
It broke again.
I fixed again.
It broke again.
I fixed it good!
I left it in the street for the garbage man.

rpapps · 9th September 2006, 06:52 AM

Just normal program sound.
These things are specific to the set they're in so you would need to obtain the correct part number from a service manual and locate a supplier who carries parts for your make and model.

You could try posting here in the Television thread

http://70.84.232.2/~hcsdcom/phpbb2/

Quote your make and model and chassis number, if you can locate it, and the component reference. Somebody there may have a manual and be able to look up the part number for you.

Cheers
Rob

PS. I still don't think it's the problem.

zBuff · 9th September 2006, 07:00 AM

Sorry I didn't realise it was against the forum rules. You can close the thread if you want admin.

Thanks for all you help guys.

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9th September 2006, 05:17 AM	#2
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Hi zBuff DL usually signifies delay line although I'll admit I haven't seen one like that before. They usually don't release smoke. What makes you think it's the culprit? Cheers Rob

9th September 2006, 05:25 AM	#3
zBuff diyAudio Member Join Date: Nov 2004 Location: NZ	Thanks for the quick reply Rob. So far it's the only component that I can see that has any signs of rupture or carbon deposits. Not too sure if the picture is clear enough to see it, but the metal is distorted (bent up) on the bottom left hand corner and the colouring seems a bit odd to me(not that I know what the usual colouring should be, due to my unfamiliarity with that type of component).

9th September 2006, 05:46 AM	#4
unmibh diyAudio Member Join Date: Oct 2004	zBuff, that's defenitely not a diode. it's more like a variable inductor, inside that metal shell would be a plastic bobbin with insulated copper wire and the ferrite in the middle is a screw and with every turn changes the inductance. I you have a diagram this will be a symbol of a transformer with a diagonal arrow across it to indicate variable. I hope this help. unmibh

9th September 2006, 05:47 AM	#5
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	No, I can't see the effects you mention in the image. If it's a luminance delay line, as I suspect, it's basically just a coil and you should be able to measure it for continuity. Of course this means accessing the solder side of the board so be real careful that it's been switched off for a while and the mains plug is pulled. If it has died you should still be seeing something on-screen and hearing sound. If the set is totally dead then I think the fault lies elsewhere. Cheers Rob

9th September 2006, 05:54 AM	#6
poobah diyAudio Member Join Date: Nov 2005	That is an inductor or a transformer... for high freqs... like 100 K to 1 mHz. Most likely it is NOT your problem. TV's are dangerous as hell... stay away from the picture tube and ANYTHING hooked to it.

9th September 2006, 06:23 AM	#7
zBuff diyAudio Member Join Date: Nov 2004 Location: NZ	The TV has been unplug for over a couple of months so I'm guessing it should be reasonably safe. The TV still did turn on but it was a black screen with a bit of a white squiggle down the bottom if I remember correctly. What kind of sound should I be hearing? It test ok for continuity, assuming I was measuring the right points on the underside, I could unsolder it to double check. Are these things normally suppose to be variable? the centre core is actually raised above the metal casing. Is there anyway to check what value is need? If you click on the picture it should show it zoomed in a fair bit. If that's not clear enough I could take a better picture tomorrow when I have better light.

9th September 2006, 06:41 AM	#8
poobah diyAudio Member Join Date: Nov 2005	I have a sad story about a TV... too long to tell. Buy a new one. My BEST advice.... really. Read the forum rules... no TV here. My short story: I got divorced. I had nothing. I bought TV. It worked for 8 Years. It broke. I fixed it. It broke again. I fixed again. It broke again. I fixed it good! I left it in the street for the garbage man.

9th September 2006, 06:52 AM	#9
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Just normal program sound. These things are specific to the set they're in so you would need to obtain the correct part number from a service manual and locate a supplier who carries parts for your make and model. You could try posting here in the Television thread http://70.84.232.2/~hcsdcom/phpbb2/ Quote your make and model and chassis number, if you can locate it, and the component reference. Somebody there may have a manual and be able to look up the part number for you. Cheers Rob PS. I still don't think it's the problem.

9th September 2006, 07:00 AM	#10
zBuff diyAudio Member Join Date: Nov 2004 Location: NZ	Sorry I didn't realise it was against the forum rules. You can close the thread if you want admin. Thanks for all you help guys.

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