Sony PVM 20L4 jitter

[Initial-d]

Hi, I’ve had this PVM awhile and it’s been solid , but recently I notice the image moves/jitters slightly when you look really close at a test grid.

I’ve read this is normally a cap problem in the deflection area and that it was two particular caps (C592 and C572 on a Pvm 1354Q). I didn’t know if anyone knew the equivalent in the 20L4 as it’s a different beast looking over the service manual. Boards D and D1 are the deflection area, but other than trying to swap out caps randomly I don’t know what ones I’m actually after.

[tongshadow]

Get an ESR meter and test each capacitor, replace the ones out of spec. There's no recipe when it comes to electronics, your case may be unique.

[Initial-d]

Had a look at some of the caps and most look to be about 10% out of spec, so I ordered a cap kit which should hopefully fix the issue.

Its a 2002 model so I thought it may not suffer from issues so soon, but its still like 20 years old and although externally it looks good... I have no idea about hours since its a PVM.

It still works but best to address things now.

[BazookaBen]

Apparently a lot of the caps in the deflection area get too hot from being too close to heatsinks, so they fail a lot sooner.

I replaced a handful in a 1353md and it looks good as new. I also found that the motherboards, and thus the caps that need replacing, didn't change a lot between PVM generations. So if you find a list of deflection caps to replace for one PVM, it'll largely be the same for another.