Sony PVM-8041Q no vertical - Videokarma.org TV - Video

ESigma25 · #1 03-01-2021, 02:37 PM

I recently acquired a Sony PVM-8041Q for a great price but it's got a major issue: there's no vertical at all, beyond a thin line. I'm sure that this is caused by failed passive components but where exactly should I look for said components? I don't really know how to read electrical schematics but I do know all the pots for adjusting the horizontal and vertical settings are on what the service manual calls the "D board". Maybe someone can help me make sense of this manual and help me figure out what to replace to get the picture working again?

https://www.manualslib.com/manual/10...Pvm-8041q.html

zeno · #2 03-01-2021, 04:09 PM

The presentation of the manual sucks ( not your fault).
If you can post the actual schematic page that will help.
I assume you have a meter to make simple tests. Odds are
its not a big problem & can be shot gunned for $15-$30 in parts

73 Zeno
LFOD !

ESigma25 · #3 03-01-2021, 04:18 PM

Quote:

Originally Posted by zeno

The presentation of the manual sucks ( not your fault).
If you can post the actual schematic page that will help.
I assume you have a meter to make simple tests. Odds are
its not a big problem & can be shot gunned for $15-$30 in parts

73 Zeno
LFOD !

Now that you mention it, there doesn't seem to BE an actual board schematic, just an electronic component listing and a listing of the various adjustments.

zeno · #4 03-05-2021, 04:39 PM

A common problem with on line schematics. They are fold outs
& usually not included. Too much work & when they are there
they are usually unreadable.
If you can find the vert out IC & measure all the voltages on it.
You can compare them with the IC's data sheet on the net.
Post it all here & we can probably figure it out. These ran nice & it
would be good to see it running.

73 Zeno

LFOD !

ARC Tech-109 · #5 03-31-2021, 04:03 AM

Replace all the caps in the vertical section on the deflection boars via shotgun approach, they're all bad being 25+ years old. Follow the yellow & green wires from the deflection yoke and they will lead you to the vertical section, red & blue is horizontal. I've done many of these monitors and they all suffered from bad caps and solder joints.

JOJCANADA · #6 03-31-2021, 01:33 PM

Quote:

Originally Posted by ARC Tech-109

Replace all the caps in the vertical section on the deflection boars via shotgun approach, they're all bad being 25+ years old. Follow the yellow & green wires from the deflection yoke and they will lead you to the vertical section, red & blue is horizontal. I've done many of these monitors and they all suffered from bad caps and solder joints.

very common problem with those old sony tvs

ESigma25 · #7 04-01-2021, 04:02 PM

Quote:

Originally Posted by ARC Tech-109

Replace all the caps in the vertical section on the deflection boars via shotgun approach, they're all bad being 25+ years old. Follow the yellow & green wires from the deflection yoke and they will lead you to the vertical section, red & blue is horizontal. I've done many of these monitors and they all suffered from bad caps and solder joints.

I ordered caps for the board with all the horizontal/vertical stuff and I'm just waiting for them to arrive.