Hi,

My Av9000 did the same thing when I got it out of storage, it was suggested that it might be a bad solderings in the power supply (see previous post below). 

/forum/general-discussion-and-questions/av9000-keeps-going-into-standby

mine is back in storage until I get my extension finsihed, so not had a chance to have a look at it yet.

Good luck

It's basically an MX6000, so many of the issues mentioned in this old thread can apply to AV9000 as well.

You will be looking for bad solderings, dried out electrolytic capacitors (all of the small elcos in the power supply are suspect, really) and bad high voltage caps at the line output stage.

Also check the solderings at the connector of the deflection coil. If there are bad solderings in the high voltage areas, you can actually sometimes see them arcing if you look in a dark room.

If the TV still turns on, there are no catastrophic component failures and it can be a very small fix - once you find it.

Thank you very much for your advice! 🙂

I have now checked the original power supply again and re-soldered all of the high voltage components and capacitors. Again, I saw no bad soldering or burn-marks on the power supply, but I re soldered the components just to be sure. I replaced the power supply that i had borrowed from the other AV9000 and it seemed to work... Or... that's what I tought! The same problem is back, it turns itself off after approximately 5-10 minutes the first time I start it. After that, when I wake it up again the time between the shutdowns are faster.

Now, I don't think that both power supplys would be broken (especially since I know the one from the other AV9000 worked and none of them showed burn marks or bad soldering. A few years ago I had a similar problem on a 1995 MX 6000. It kept turning off itself, but that time it was a bad solder on a capacitor in the power supply. I could even smell that something was burning. But now I don't smell anything at all.

Yes, the TV always starts instantly when I press the remote right after it have died. So your probably right that it's just a small problem. But I'm running out of options. I mean, what else could it be than the power supply? Line output stage and deflection coil? Are they on the same PCB as the Power supply?

Sorry, I'm not that experienced with TV:s.. 😕

Time to start replacing capacitors then I guess. If you got the other power supply board from a unit that worked years ago (sorry, I couldn't quite follow the sequence of events) there's really no guarantee that it would be any better now.

mattiasf92 wrote:

Sorry, I'm not that experienced with TV:s.. 😕

Make sure you don't kill yourself in the process - the HV sections are lethal 😛

Well the powersupply from the other AV9000 worked perfectly a few months ago. I don't think the problem lies there. What I'm wondering is if there are any components on the other boards that can cause this problem? 😂

Thanks! 🙂 I am not very experienced with TV:s, but that I know! I always discharge the picture tube properly and disconnect the tv! 🙂

What does the self test say? Did you start service mode?

It monitors the defect when it switches off.

Just connect the two pins called service mode on the scart input board and it will show you the last error in its memory.

Was this set ever repaired? I am repairing a mx4000, which has exactly the same symptoms and last error B6. So far ive recapped the power board and the video board (fixing an issue with the onscreen menu) however its still switching itself off and has B6 as the last error code!

The worrying thing here was that the last ever post from the OP was the last one on this thread five years ago...

CRT's, as mentioned, can be lethal..... I do hope he's ok! 😮