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CTV 1982 Baird 8233 TX10 Teletext

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RichardFromMarple
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I got the impression that a lot of Thorn's income was from making sets for rental, which went into decline as people started to buying sets on credit.

When we stopped renting a sets, my family bought a 16" Philips CTX which lasted until the digital switch off with only the channel battery needing to be replaced.  I remember my Dad panicking when the sound vanished, only to find someone had flicked the switch!  He had a similar moment when the contrast knob on the back was knocked by my Mum when dusting!

in 2001 I bought a late 21" Philips 4:3 CRT set, which was still running as good as new in 2016, when I gave it away because I live in a flat & couldn't store it.

 
Posted : 04/02/2024 1:05 pm
irob2345
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These days, it's the grandchildren who are called in to fix Grandparents' not-so-smart TV.

 
Posted : 04/02/2024 8:51 pm
WayneD
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Posted by: @slidertogrid

Ooh that has been damp! Is the tube the original Videocolor PIL? Most of these were rather than the 30AX tube used in the retail models.  

I've been told that the 30AX tube was used in the teletext-equipped sets as they were better quality for reading the text. Any idea if this is true?

 

 
Posted : 04/02/2024 9:01 pm
Jayceebee
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@wayned Not so I'm afraid. Pot luck what you had fitted in first production versions. Only 30AX was used in the Mk2 & 3 TX10s. The PIL S4 did reappear in the TX100 but only in some of the 22" Logik branded sets for Dixons/Currys. Your 8233 is a Mk2 with the later signals board BTW.

John.

 
Posted : 04/02/2024 10:30 pm
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WayneD
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@jayceebee aha. I know someone mentioned that the MK1 had bass and treble controls behind the flap. This one has volume and tone controls.

Hopefully I'll get a chance to get some power into it this week and see what's what.

 
Posted : 05/02/2024 10:36 am
WayneD
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Ended up putting a 150 watt incandescent light bulb inside to dry it out and it's made quite a difference:

Screenshot 20240205 131228

It's really brittle now though. I may attempt to recreate the intro to the 80's music show The Tube where the logo blasts out the top of the TV with it later.

It does work though! 

Screenshot 20240205 131208

Bit of a red tinge to the snow, although it looks more violet here. Just letting it warm up for 30 minutes on static before I put a single in.

 
Posted : 05/02/2024 1:19 pm
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WayneD
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It wouldn't tune into a signal. Had a look at the board and...

Screenshot 20240205 152230
Screenshot 20240205 152140

Hello Varta my old friend, you've destroyed electronics again...

 

 

 
Posted : 05/02/2024 3:30 pm
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Jayceebee
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That's a shame but sadly I rather expected it although not quite that bad. These sets with sweep tuning are probably rather rare now, I don't think there was ever a retail TX10 model released with this feature. 

If the CRT is good and the set is worth continuing with then the options if a replacement PCB cannot be found are to fit a scart or AV in/out TAxxx kit and use baseband inputs, these often turn up on eBay. Another option is a replacement blank board, just so happens I've just completed the equivalent replica for a Philips 2A for member @stevesje71 who's set had suffered the same fate. 

John.

 
Posted : 05/02/2024 7:49 pm
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Lloyd
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ouch...

 
Posted : 05/02/2024 7:56 pm
irob2345
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That's a simple single layer PCB. I would repair it.

Wash the whole board in hot water and detergent.

Use a plastic scouring pad on the damaged tracks to see how much copper you have left.

Rinse in lots of water.

Dry the board (in the sun if you have any, else use a shoe drying rack in your clothes drier)

Check damaged tracks for continuity.

Bridge out any o/c tracks using a light gauge tinned copper wire.

Fit a safer battery.

 
Posted : 05/02/2024 9:11 pm
WayneD
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@jayceebee weirdly enough I was just looking at the October 1991 issue of Television magazine regarding adding a Scart connector to a TX10 and others using the same decoder chip. I was considering adding RGB directly as my PS3 which I mainly use for streaming to my TVs can output RGB. Seems pretty straightforward, just a matter of sorting out the sync connection.

 
Posted : 05/02/2024 9:55 pm
WayneD
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Posted by: @irob2345

That's a simple single layer PCB. I would repair it.

Wash the whole board in hot water and detergent.

Use a plastic scouring pad on the damaged tracks to see how much copper you have left.

Rinse in lots of water.

Dry the board (in the sun if you have any, else use a shoe drying rack in your clothes drier)

Check damaged tracks for continuity.

Bridge out any o/c tracks using a light gauge tinned copper wire.

Fit a safer battery.

I'm very familiar with Varta battery damage on my Amiga computers, my Amiga 2000 which I have a post about in this very forum was suffering from Varta death spill.

I tell you what I'm very intrigued about, a shoe drying rack in a clothes dryer. How does that work? I'm presuming that must be an Australian thing as we have tumble dryers in the UK. Is it a different type of clothes dryer?

 

 
Posted : 05/02/2024 10:01 pm
Nuvistor
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@wayned Perhaps something like this.

https://www.johnlewis.com/john-lewis-3-tier-heated-indoor-clothes-airer/p2427279

 

Frank

 
Posted : 05/02/2024 10:14 pm
irob2345
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It's a rack that clips into your tumble drier. There are two "feet" that sit on the door frame and a pin that fits into a hole in the middle of the back of the drum. No, the rack doesn't rotate.

My Fisher and Paykel drier has this, I thought they all did...

FandP Shoe Drying Rack
 
Posted : 06/02/2024 10:05 am
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WayneD
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@irob2345 no, I've never seen that before. What a damn good idea!

Just looked at our dryer, whilst one could certainly clip to the front behind the door there's no hole at the back of the drum. Most dryers in the UK are probably the same.

I suppose we just put wet shoes on the radiator here.

 
Posted : 06/02/2024 10:14 am
WayneD
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The sweep tuner is in an incredibly bad way so for now I've just attached a manual tuner from another TX10 so at the very least I can see if the zappy bits are working:

Screenshot 20240206 160540

Hmm...

Screenshot 20240206 160602

 Frame IC?

 

 
Posted : 06/02/2024 4:09 pm
Jayceebee
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@wayned Looks more like the line hold is slightly off or there is no sync. What exactly are you feeding in? If you have a remote for it put it in text mode. You should then get a locked P100 in the top LH corner even with no signal input. The teletext decoder should generate it's own AHS, After Hours Sync.

John.

 
Posted : 06/02/2024 7:41 pm
WayneD
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@jayceebee was a couple of corroded traces going to the TDA2576. I honestly think this set has been submerged on one side:

Screenshot 20240206 213558

But now I have a steady picture, no red though:

Screenshot 20240206 213803

Deal with this tomorrow. I need to go to bed.

 
Posted : 06/02/2024 9:42 pm
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Till Eulenspiegel
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I notice the MC14426 integrated circuit.  I seem to remember a special chip was made for single and double 7 segment number displays.   Sixteen channels would require a five bits wide control system. Decimal 16 would be 10000.

Much easier to use a 4 bits wide system so that channel 1 = 0000,  2 = 0001 and so to 16 which is 1111.

Normal usage decimal 15 = 1111.

Till Eulenspiegel.

 
Posted : 06/02/2024 10:29 pm
WayneD reacted
WayneD
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We're back up and running! Well the TV chassis part is anyway. Neck board was plagued with dry solder joints.

Screenshot 20240207 154427

Deal with this next:

Screenshot 20240207 154817

 

 
Posted : 07/02/2024 3:51 pm
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