Sony Trinitron 1342q has signs of vertical collapse?

[Mr.lameandwatch]

Hi
Im a new person in these parts, and i was directed here to get help with this trinitron 1342q i got.

https://www.reddit.com/r/crtgaming/comm ... _any_help/

So the pvm has a line going horizontally tward the top, and some type of weird warping on the top as well when things are moving in game.

So far, i have tried my n64 with svideo, and playstation 2 through rgb scart with a bnc breakout cable and has the same problem in the same exact spots.

What sucks is i just this one after my 1343md came destroyed in shipping
(case mostly destroyed, but the innards looks unharmed), and now this problem. Some introduction to RBG gaming -_-

So i would like to ask for any advice on how i could repair it.
If its something on the deflection circut is it possible to use parts from the busted one?
Im not familiar entirely with tvs and circuitry but if i knew the problem, id know how to get it fixed
any help id appreciate, thanks

If i need to provide any other info ill try to when i can

[Xer Xian]

This board does get lots of help requests about servicing CRTs, but it seems to me that there's not an awful lot of people with the required knowledge around - or more likely, they got tired of rehashing over and over again, which is certainly understandable.

Most of the times the first thing to do is looking for bad capacitors or doing a full/partial recap. Here's the cap kit of similar (but not equal!) PVM's, and here's something to give you the basis on recapping. Please be aware that I'm as n00b as you are on the matter - I'm just half decent at digging up generic info.

[buttersoft]

That doesn't look like vertical collapse, the top of the image is undistorted, the other lines are being drawn on top of it - http://tinypic.com/view.php?pic=2v1annd ... jxCafmGOpo

Looks more like vertical foldover. This happens when the pump-up boost capacitor in the vertical section fails. The vertical sync pulse triggers the pump-up cap to discharge, but as it dries up and gets weaker it fails to store enough energy, and the lines of the new frame start drawing while the beam is still on the way back up. After this the image proceeds to draw normally, so it looks like someone has folded the top of the screen over.

Try the V-size pot first, see if that helps. The image should fill the screen without those lines, of course.

If that doesn't work, here's the service manual - https://elektrotanya.com/sony_pvm-1341_ ... nload.html

Page 31 (of the PDf, p43 of the manual) has the schematic for the deflection section. I would start by replacing C547 (under ref 22) and probably also C549 and C591 just for kicks (ref 23). This is mostly info i learned from google, but it's worked for me a few times

[Mr.lameandwatch]

Are you talking about the dials on the back of it for V hold and H cent?

Yeah adjusting that doesn't really do anything to make it go away

Ill take a peek inside and look at those specific caps and see if those look bad

[buttersoft]

Are you talking about the dials on the back of it for V hold and H cent?

Ill take a peek inside and look at those specific caps and see if those look bad

No, the V-size adjustment is a pot on the A board inside. These size and position adjustments are all marked in the service manual.

The caps probably won't look bad, they're just drying up slowly. Test them if you can, but replace either way. Unless you spot something else obviously faulty, of course.

Hopefully this cures the problem. Afterwards you'll probably need to set the V-size and V-pos again.

Remember that the CRT can hold charge after it's powered down, so if you need to detach the anode cap you should discharge the tube first. Sony will have a bleeder capacitor on the set, but you don't know what condition it's in.

[Mr.lameandwatch]

Oh i see now
Alright ill make an adjustment to it in just a bit and see