CTV Barco 3200 Frame IC Equivalent.

Hi Jan,

I cannot help with a directly listed equivalent for the ESM431S, what I found out is the following information, it's better than nothing, though not much, but at least gives you something to go on.

The IC package is QDIP-14, the IC was made by Thomson-CSF. I'm guessing the suffix "S" denotes the package type, in your case I would suggest it is correlates to Thomson's "CB-108", not the CB-135, both their QDIP-14 equivalent.

The data listing I have is from 1977, so I believe may predate your IC and curiously the ESM431 listed is a B&W vertical deflection IC. I would suggest that a later condensed data book might have colour listed.

The service manual for the TV is for sale in the U.S.A. but with shipping will likely set you back more than you paid for the TV. If search Barco CRM 2032 2632 2650 Monitor Service Manual *Original* it will provide you with the eBay link.

It might also be worth contacting French TV forums, they may be more familiar with the IC, perhaps even look on eBay.fr

Kat Manton worked on one of these 16-years ago, her problem was with the decoder, so the thread is of little help for your trouble, nonetheless, an interesting read.

https://www.vintage-radio.net/forum/showthread.php?t=32156

Hi Chris. 

Thanks for the info. I’ll have a look around on French forums. Nothing listed on eBay.Fr. 

If nothing comes up, It’s looking like it’s going to be a parts donor. Which is a shame, as it’s quite an unusual set.

Cheers.  

Jan 

It's a shame we cannot find the circuit diagram other than the manual for sale in the states. I feel sure if we could see that, and understand how Barco strung the field output stage together, the clever folk at VRAT, I'm looking at you @jayceebee could figure out an alternative, with possibly only a few minor alterations.

Whenever I've been stumped for missing critical parts (e.g. G6) John has always come up with a solution, though we did always have data, he really is the MacGyver of VRAT. Not sure if he is back from Japan, but as I've used the mention (@xxxxxx) feature of this forum, he will have received an e-mail notification of this thread.

I know he loves brain-teasers such as this. Currently in the absence of a cct, any chance, you can take a photo of the field stage component and print side. It might also be worth putting a request on UKVRRR wanted section for the "BARCO CRM 2032" circuit diagram. Unlike us, they have a lot of continental members who might have the data, or know where to look for it. I've searched Electrotanya without success.

p.s.

If you want to split the costs of getting the manual, I'd be happy to do that, as it would be a good addition to the VRAT data library. All in delivered, it would be £36.99, so £18 quid each. Although there will be no guarantees we will be able to fix the TV, but we would at least have a fighting chance. No problem if you think it too risky, but the offer stands should you wish to pursue the repair.

Just back but very jet lagged. Looking at the UKVRRR thread lt appears that the CRT is a 20AX type. The IC package reminds me of the TDA2600 which was used in the G11 driving the same CRT. The data describing the device for mono TV would suggest the need for maybe a transistor power output stage in addition? A circuit would be essential to make any attempt at a replacement but knowing how complex Barco designs are this might be a very difficult challenge.

I have to admit I’ve never seen an episode of McGyver.

Thanks Chris and John. 

Very much appreciated. 

I’ll put a post up on UKVRR with a request for a manual. And get some photos of the chassis tomorrow. 

I think this set is quite different to one in the thread on UKVRR. This one definitely has a 20” 90degree S4 tube with the side contact base. 

Cheers. 

Jan

Back in the day I used to replace a big range of vertical circuits and ICs with an LM1875.

Most vertical circuits are basically just a power opamp with current feedback. The LM1875 fits in well and doesn't need the commonly-found bootstrap cap.

It can work on up to 60 volts, push and pull several amps and the case is connected to the negative rail which in most TVs is ground. So no insulation needed on the heat sink tab. If you can meet these conditions it may work for you.

The part is virtually bulletproof, just don't short the output to the negative rail!

I would be looking at an audio amplifier chip for this, and the chip I think you should start with is a TDA2010, a few Earley TV sets use an audio  amp chip for the frame with an external flyback circuit, bush ranger springs to mind. 

The Rediffusion MK4 20 inch used a 90 deg S4 crt. Could be possible to fit a frame chip used in these. Need to look up the ic number.

Here’s some pictures of the chassis and the timebase panel. 

@Michael Dranfield The TDA2010 (MDA2010) has the same footprint. 

Cheers.

Jan 

I could quickly design an adaptor PCB to take the LM1875, which is a far more rugged part than the original.

Readily available and cheap too.

Posted by: @yampy187

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Here’s some pictures of the chassis and the timebase panel. 

@Michael Dranfield The TDA2010 (MDA2010) has the same footprint. 

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Cheers.

Jan