Sony PVM Broken (Need help)

Right now I feel really bad for my friend, he purchased a PVM off eBay and here's how it looked before it arrived.

Here's how it looks now.

It's a PVM-20M2MDU

Essentially the power button is missing (probably inside the unit) and I asked him to use a 3DS stylus to poke directly in to see if it hit a switch and he said it was deep, and didn't hit a wall straight forward.

The PVM should work fine if we can figure out how to power on the PVM with the button broken like this. So I have a few questions if anyone would be gracious enough to assist my friend.

1. Is it possible to use a remote with this?
2. I know CRT's are rather dangerous to open, is it safe to merely open the shell to mess around with the power button?
3. Any advice?

Thank you.

 

1: It does support a remote, but not the kind you think of (IR receiver) - it takes input via RS232.
2: It should be OK to mess with the button if you can get to it without touching the back of the tube. However, this is unlikely, since most of the time you'd want to access the tube/supporting electronics so the cases are built to expose that first. Read up on how to safely discharge a CRT, or better yet find someone experienced with CRT TV repair.
3a: find the user- and service manuals, 3b: bothering with any of the remote stuff probably isn't worth it

 

Where are your friend? If he's near someone on this forum who has experience with CRT maybe your friend can meet up and have the PVM looked at? Best case, the plastic knob was pushed in too far and popped inside. Worse case: the mechanical switch broke off which would require repair.

Generally CRT shocks doesn't kill outright if it's not plugged in, it's the reaction to the shock that can hurt or worse, such as dropping it on your foot or something. I haven't been zapped but I've gotten a little too close to the anode line while it was powered on, it'd make hairs on your hand or arm stand up permanently.

 

You have 2 choices:

1. Send it back
2. Take it to a sympathetic TV repair man who'll still work on CRTs, and hope there's no damage to either the plastic or PCB (it's quite likely) prohibiting a repair.

EXTREMELY irresponsible advice. If you don't know what you're doing, DON'T MESS AROUND WITH A MASSIVE CAPACITOR. IF the discharge circuit is working, there's probably little left in it - but you can't guarantee that. Yes, you can kill yourself from the shock - especially if it runs across your heart because you've been messing around willy nilly with both hands in there. Yes, you can hurt yourself by reacting to a shock, too.

I would not recommend messing around inside on your own. You also need to consider what other damage may have occurred inside, and that needs to be inspected by someone who knows what they're doing. CRTs are dangerous.

The switch is on the J board which connects to the G board. In theory, you could short the two poles either on the J board or the G board and remove the J board if it is no longer firmly secured (should be two outer poles together and two inner poles together, but whoever does it needs to be certain), but remember it's mains so use the correctly rated and insulated materials.

You can't get the J board assembly any more, but the board itself is probably OK. You might be lucky and it's just come loose, but it could well be that the screw mounts have snapped. If the switch has gone but the board is OK, you may or may not find a suitable replacement.

 

worst case OP would have to have a different panel mount switch installed, which would not look stock but at least work..

I don't own any PVM but I'm guessing the j board connects directly to another PCB and doesn't use a flex like some other equipment..

 

What, at 240 volts?!

 

As mentioned CRTs around the Flyback transformer have high voltage, even when unplugged. Keep clear of that when you pop the cover. That power switch can be an easy fix, just be very wary what not to touch. You can discharge the Flyback, but that has its own safety risks in addition to blowing the decades old capacitors.

I have soldered in new chips on the D Board of my WEGA without that risky discharge, just kept clear of the Flyback. Also pulled the covers off all my CRTs including TVs, and PVMs for a dustout. Be very careful and it can be done.

 

http://www.farnell.com/datasheets/1805063.pdf

 

Oh, what is it with Aussies using weird English this week?

That's a 3 core mains cable lol.

As per what I said and the diagram, the J board connects to the G board. The G board is the PSU. I'm fairly sure from the diagram it's just a connector to the board, but I don't remember going in this model so I can't be sure. Sony do weird things sometimes!

 

Plenty on British electricians call them flex cables