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- Solid State CRT Televisions (http://www.videokarma.org/forumdisplay.php?f=184)

- - Sony PVM-8040 (http://www.videokarma.org/showthread.php?t=272288)

LADR	11-23-2019 03:14 AM

Sony PVM-8040

Got a Sony PVM-8040 at a hamfest the other day. It produces a great picture, but, none of the front controls and power LED indicator are not working at all, like the board is dead. All the correct voltages are there. Thoughts? This is way newer than anything I’m used to working on.

zeno	11-23-2019 12:26 PM

Is that the one with backlit membrane buttons ?
What they may be doing is putting the button commands into a small IC
then sending one line to the micro. Also check the TAC switches for
being closed & locking out all of them. Look for rust, water stains
& damaged membrane.
I did quite a few PVM's but the only problem on most was a 'litic in
the vert.

73 Zeno:smoke:
LFOD !

freakaftr8

11-23-2019 03:32 PM

Are all voltages coming off the rails of the stand alone power supply? Check solder joints at the ribbon connectors going to the button board. They are known for moisture contamination also.

LADR	12-08-2019 02:05 AM

1 Attachment(s)

Quote:

Originally Posted by zeno (Post 3218027)

It’s not the one with backlit buttons. It’s just potentiometers.

MadMan

12-08-2019 02:21 PM

If my Sony tv is any indication - cracked solder joints. Everywhere!

I was actually just thinking about it earlier... I wonder if it was an early attempt at lead-free solder?

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