Forum > LCD TV forum

Toshiba 40LB702B No sound

<< < (2/2)

Turnip:
Hi Dave,

They're 0.8 Mfd 6.3v - Though seems value can vary a bit making little difference.

Wouldn't mind but they're horribly small to replace without print damage, and most of 'em get away never to be found again.

Best of luck - Chris.

Davy:
Too right they are horribly small.... yikes 0.8mfd, geesh that's 1u innit.... now 0.8pF I'd be understanding lol.

Well, the chap went out and bought a new telly, when time permits I'll have a play so if ya' see the moon with two faces 'giffus a wave'.

I did get the circuit but it doesn't show them on!!!! I can see them on the layout but certainly not on the diagram, only shows the basic gubbins. The NTP-8030 capable of generating 30 watts per channel and will work from 7 to 28V... me thinks it need a liquid nitrogen supply, PCL84 bless em' they'd work, work and work.

Dave

Turnip:
Hi Dave,

Attached a diagram of sorts. You'll feel really great if you get 'em all in straight and the sound booms out in a true Vestel manner. Noticed in other Vestel boards they seem to use discrete audio chips around 3mm square using the board as a heat sink. Haven't met a duff one yet, and as they have underside connections I don't want to.
Wasn't the PCL84 a CDA in certain early hybrids ? Preferred the PCL83 as it went all Black inside and burned up the volume control - Bit of an earner.
Out of interest have an ancient French radio in to sort - Made in the 50's by a man and a dog in a shed - (Vinix) Was checking valves as you do and came up with the ECLL80 - Never met one but really impressed as the triode and one of the pentodes share the same control grid due to a lack of pins. Also met a push-pull audio amplifier using a couple of ECL80s with all the cathodes connected together - Nifty - Chris.

Davy:
Uh, I thought they were C80, 81, 82 and 83 15nF, not the ones that you pointed out.... see this video
https://www.youtube.com/watch?v=JV-v9CfH7ow, thanks for the link, I've made a note of those 1uf caps.  Not exactly the same model as in the video but sure does look the same board.

There is sound at the headphone output but it isn't what I would call loud, I'm wondering if it's  the muting contact on the socket, I'll have a shufty when I get time.

One common trick to get the sound back is to enter into the service menu and do a factory reset, I understand Toshy issued a firmware update on a USB stick for this.... I did try a  'Search for update' but non was found, still no sound.

Dave

Turnip:
Hi Davy,

Can't say,

Only that I replaced the caps in the picture and sound returned, and they were 0.8Mfd 6.3v.

Horrible job but each set had sound of a tinny sort.

Had a 48 inch Vestel Celcus in the other day and it uses the same speakers as in small screen Vestel sets, Realise it's budget but surely they could have squeezed in a woofer for a couple of quid more.

New budget sets tend to use Chinese boards, Vestel seemingly too expensive, and we know what they're like with 'End Of The Road Guarantees' and later Eeprom issues -  Chris.

Navigation

[0] Message Index

[*] Previous page