Problem Toshiba 2835DV CRT TV Vertical Collapse

[2huwman]

I switched this TV on this morning after a couple of years of not using it, and of course it's not working properly! It's a shame as it had a really nice picture and hadn't been used much. I'm assuming this is 'vertical collapse' (which is how I feel when my stuff breaks!).

Does anyone know if this is fixable? I can do basic soldering and can usually follow simple instructions. Any help much appreciated. Thanks!

 

[tb2000]

Yeah that's vertical collapse. Assuming as it's a TV and not a monitor the vertical deflection plug terminals aren't burnt/overheated, it could be as simple as a dry cap or something. Problem with later TV's like this is that just about everything is computer controlled so i'd guess there's not a standard vertical deflection chip like you'd get on an arcade monitor chassis. With that said, some of the later multisync arcade chassis that are osd types still can have a vertical deflection cihp so it might be worth looking for one just in case it has got one and checking it's not shorted and checking the surrounding circuitry.

 

[jerryspaghetti]

Don’t leave it on for long like that as it’ll burn the tube

 

[M K L]

https://elektrotanya.com/toshiba_2535ds_2835ds_sch.pdf/download.html

Check for the 27V supply voltage to pin 6 of vertical IC301 (TA8427K). If there's no voltage probably R327 is open. There is also a "protector" (ZP31) after the rectifier that could be open. Measure resistance across pin 6 and 1 of IC301. If the resistance is very low the IC is shorted.

 

[Retroman839]

Apolagies for interrupción.

Does the flyback supply
The 27v on this chassis ?

Is piggy backing these ic
With new ones to test
Hori/vert deflection ic
Applicable ?

Checking correct voltage supply to vcc first before piggy bck.

Trouble shooting similair issue with ic .
Thx

 

[M K L]

Yes, 27V comes from the flyback.
Piggyback? No. If the vertical IC is suspected of being bad it should be replaced.

 

[Retroman839]

Thanks