Bang & Olufsen MX7000 CRT Notes

Having dipped my toe back into vintage gaming again, I decided to pickup some CRT TVs.  I’d seen some people playing with Bang & Olufsen MX series, mainly the MX4000 and MX7000.  I wanted to try a 28″ screen and a B&O popped up on eBay so I thought I’d give one a go.

Back in the day I used to resent that being in EURO/PAL land meant playing games with borders, slower speeds and delayed for months usually.  What I didn’t appreciate (at least until the PS1 and Saturn days) was that we had RGB Scart nice and easily available, and then the next generation of consoles we starting get 60Hz support – ah well, swings and roundabouts I guess.

Now, there’s already a lot of great info out there about these TVs, forum posts on shmups that are a goldmine of info and YouTubers sharing lots info.

Here is my small post to compliment that info and pick out what I found useful when adjusting my MX7000 running SW2.0

Being an early version of the software meant some of the tricks I was finding online weren’t working for me.  So, here’s my notes…

Service Menu

Accessing

I couldn’t get into the Service Menu using the Beo4 Remote – the usual command is TV – MENU – 1 – 1 – GO (or TV – MENU – 0 – 0 – Go on the MX4200 apparently).  I had to take the back of the TV and short two pins out.  I eventually installed a switch so I could access this externally – not only is this much easier, but MUCH safer.  There’s a couple of of YouTube videos you can watch to see how to add a switch, see Faginrs500 and modology.

Disclaimer

It should go without saying, if you’re taking the back off of a CRT, you need to do some research first to ensure you know what you shouldn’t touch.  There are a lot of volts in there, you need to know what you’re working with.  There’s also tips like working with one hand in your pocket/behind your back, please do your research – I can’t stress this enough, the Retro Tech YouTube channel has some useful info.

Here’s my photos showing the switch I installed…

 

Adjusting Geometry Whilst Seeing Your Console

It’s highly likely that once you’re in the Service Menu, your TV is now just displaying the old TV static  which not only always reminds me of the film Poltergeist, but also makes it difficult (not impossible) to adjust and check your settings with your Console image on screen.

I found a few guides on how to do this, but the menu on my TV was lacking some of the options so I had to resort to reading the manual!?

Plug your console into AV2, this won’t work for AV1 (don’t worry, unlike most TVs with more than one Scart socket, both of them on the B&O support RGB!).

On the Remote (Beo4 – I don’t think it’ll make a difference if it’s a 1000 though), press…
TV (if not already on, this will switch the TV on and put it on the TV input)
Menu
Scroll down to…
Setup
Then use the right arrows to go down to…
AV2
Using the Up/Down arrows to select…
Decoder
Whilst you’re in here, you may as well set AV1 to V.Tape-1 (now pressing V.TAPE on the remote will switch to AV1)
Press GO – this saves this setting.

That much pretty much matched what I’d read elsewhere, except I didn’t have a Sockets section in the Menu.

Still on the remote, keep pressing List until you get to V.Setup and press GO.
My first item in the V.Setup options is Tune, so I pressed GO again.
Press the Green button, this will switch Decoder (shortened to Dec on the screen) to ON and will now display the console image!

Keep pressing List whilst looking at the remote until it says Store, then press GO.
It prompts what channel, I was already on CH1 so I left it on this.
I think at this stage it prompted me to name it too, I went with the name AV2 which made sense.
Press GO (twice I think it was) to save this and then Exit.

Geometry Settings

Before making any changes to your settings, you really should make a note of them, it’s extremely annoying to fiddle with a couple of them and then realise you want to undo what you just did, to then find out there’s no undo button and you haven’t written them down.

Once you have the Service information details on the screen, use Left/Right to flick between the settings, then adjust them using Up/Down.  I couldn’t find a simple to follow diagram tweaked for the B&O MX series online (but there’s plenty of descriptions of what each of the settings do, like this post from futurematt5).  Here’s a diagram that I took for a different TV and tweaked it to suit the B&O…

Repair and Maintenance

Over on the BeoWorld Archived Forum, there is an amazing post by Die Bogener – it includes which capacitors and components are best to replace and which might have dry solder joints, what the the different error codes mean etc.

I’m not going to get into doing a capacitor replacement guide or anything, just pointing you to the info (and I’ve got a copy of in case that archived forum post ever vanishes).  Somewhere I read about adjusting the Focus by turning the potentiometer on the circuit board attached to the neck of the tube, you can get special non-conductive tools specifically for this for a couple of quid on eBay, I searched for Anti-Static Trimmer, use words like that or pot trim tool etc, this is probably safer than shoving a metal screwdriver in there.