In a solid state b&w TV set is there a vertical timing capacitor that is not an electrolytic cap. If it does and the cap opens or shorts would that likely stop the horizontal deflection as well. This tv I’m working on has an ic chip that controls both I’m trying to determine if the ic is bad or a possible cap. It had vertical but was flickering in and out then both went dead.

Yes. A B&W will have an osc stage, one for Vert & one for Hoz.
there will also be hold controls. Many varieties so need more info
& symptom to help if you need it.

BTW Betters color sets @1975 ++ have a master osc for both V & H
The master freq gets divided down or counted down so both can go
out at the same time. Sylvania was first, called it a think chip &
was on the GT-Matic line. Very stable, reliable & saved parts. Cant beat that !

73 Zeno:smoke:
LFOD !

Exactly, W/O further information, it's quite impossible to offer any guidance beyond wild speculation, it's true that many sets of the era did have linear ICs at the heart of the main board that did most of everything, W/O knowing the make, or MO#, or perhaps the IC# in question, it is kind of like flying blind.

I don't think any TV was designed so that failure of the sync IC would stop the horizontal sweep from running (a sure way to burn up horizontal outputs and/or flybacks). The first IBM PC color monitor did that, resulting in a lot of failures when they were turned on without connecting to the video/sync output of the PC. TV designers laughed at that blunder. It is conceivable that some sets had a safety feature to prevent burning a line into the CRT if vertical failed, but I can't point to one myself.

The first IBM PC color monitor did that, resulting in a lot of failures when they were turned on without connecting to the video/sync output of the PC. TV designers laughed at that blunder..

:tears: :tears::yikes:

Please Don't remind me of that horror! :O

First job out of HS, Computer repair shop... I SAW IT! :yes:

Here’s what I’m working on Sinclair mtv1 and the ic is not available or interchangeable found nothing online so I’m trying to rule out if the ic is bad or not. This is an electrostatic crt tv.

This is a rough schematic of the deflection ic. Don’t know if this can be matched.

Looks like it has a TI symbol on the IC.What are the numbers ?
You can also check the pins for the VCC ( B+). Probably 12 VDC. And see if it
gets real hot or stays cold when on a while.
BTW IIRC shango did one a few yrs ago.

Zeno

Looks like it has a TI symbol on the IC.What are the numbers ?
You can also check the pins for the VCC ( B+). Probably 12 VDC. And see if it
gets real hot or stays cold when on a while.
BTW IIRC shango did one a few yrs ago.

Zeno

It uses 4.8v and staying on awhile it don’t get hot or warm.

Looks like it has a TI symbol on the IC.What are the numbers ?
You can also check the pins for the VCC ( B+). Probably 12 VDC. And see if it
gets real hot or stays cold when on a while.
BTW IIRC shango did one a few yrs ago.

Zeno

How could I find out if Shango did one I looked but there’s alot of his videos.

https://www.youtube.com/watch?v=meXXNk4A9gM

https://www.youtube.com/watch?v=meXXNk4A9gM

I seen that one and all she does is rips everything apart and that’s it.

https://www.guenthoer.de/doku/service-sinclairmtv1.pdf

From what it seems, the ICs are proprietary, and quite unobtainium, and aside from getting lucky and finding a bad cap/resistor or connection fault, chances of it working are very low.

https://www.guenthoer.de/doku/service-sinclairmtv1.pdf

From what it seems, the ICs are proprietary, and quite unobtainium, and aside from getting lucky and finding a bad cap/resistor or connection fault, chances of it working are very low.

Yes I know they are not available and specifically designed for this set. The 3 volt regulator is working and battery voltage is where it should be and has a ground so I still can’t rule out anything else as I don’t want to condemn the ic unless I am sure.

From what I have seen, this unit has a very bad reputation of self destruction due to battery leakage and even perhaps bad caps, where the electrolyte has attacked and destroyed the connectors on and in between the boards, and possibly traces on the board, and interconnects between the top and bottom of the boards.

All should be inspected under a good microscope.

Well fortunately this one had no corrosion and I have 2 others I recapped the power board and they work great and new batteries.

I can’t even check this ic in any way because I don’t actually have a sort of pin out of the ic.

Is it common for a pnp to92 transistor to have full battery voltage on each end while the center pin I believe is the control voltage.

Caution - while many/most bipolar transistors have a E-B-C (emiiter-base("control") -collector) lead arrangement, some may have a different order. A PNP transistor would have the most positive voltage on the emitter, a few tenths of a volt less on the base, and least positive on the collector. So, you could be looking at a normal functioning PNP with a different pinout.

You need a schematic of what's connected to each pin of the transistor to figure this out.

Hi to all,

@Timmy:
i posted here links to full documentation on the Sinclair MTV1 micro-television; 3x illustrated pdf's:
please upload & use.

http://www.videokarma.org/showthread.php?t=276487

The 3x pdf's are here, on the British forum, post #10:
https://www.vintage-radio.net/forum/showthread.php?t=206856

This topic should moved to the "Transistor Portable TV" section, not Vintage (B&W, tube TVs).

complete schematic of the MTV-1 in this post.

if your Sinclair chip is dead, best place to find one is in the UK.
Post a "wanted" add on the UK Vintage forum appropriate section; here:

https://www.vintage-radio.net/forum/forumdisplay.php?f=28

Regards
jhalphen
Paris France

Hi to all,

@Timmy:
i posted here links to full documentation on the Sinclair MTV1 micro-television; 3x illustrated pdf's:
please upload & use.

http://www.videokarma.org/showthread.php?t=276487

The 3x pdf's are here, on the British forum, post #10:
https://www.vintage-radio.net/forum/showthread.php?t=206856

This topic should moved to the "Transistor Portable TV" section, not Vintage (B&W, tube TVs).

complete schematic of the MTV-1 in this post.

if your Sinclair chip is dead, best place to find one is in the UK.
Post a "wanted" add on the UK Vintage forum appropriate section; here:

https://www.vintage-radio.net/forum/forumdisplay.php?f=28

Regards
jhalphen
Paris France
Yes I have all 3 but I am looking for the deflection IC how do I go about posting a want ad on the site you posted. Unless you have a few of the IC chips I’ll buy from you. I could really use several of these ICs since I have 2 of the mtv1 tvs and they work great but if that chip goes bad it’s worthless. Do I have to register on that site with a name and password.

Hi to all,
Hi Timmy,

i have none of the Sinclair ICs.

Yes, you have to sign up to UK-VRR to post on their forum.
it's free of course.

Sinclair TV were designed & built in England, so it's obviously the best place to hunt for specialized parts.
in your "wanted" post don't forget to mention that you're in the US to take into account postage fees.
An IC or two fit in a padded envelope, so easy to mail.

Best Regards
jhalphen
Paris/France

Hi to all,
Hi Timmy,

i have none of the Sinclair ICs.

Yes, you have to sign up to UK-VRR to post on their forum.
it's free of course.

Sinclair TV were designed & built in England, so it's obviously the best place to hunt for specialized parts.
in your "wanted" post don't forget to mention that you're in the US to take into account postage fees.
An IC or two fit in a padded envelope, so easy to mail.

Best Regards
jhalphen
Paris/France

Hi yes I now have the want ad posted in your neck of the woods now but problems with passwords but I’ll get it. Thanks for the info.