Hello and welcome to Beoworld!

I think the burned out bulbs may well be affecting the way the unit operates. Your best chance of sourcing a replacement would be to send a pm to Martin (username Dillen) on this forum.

Simon

I can't rate Martin's lamp-kits high enough, I have just one for the 1900 waiting a moment to replace the lamps. And I have already repaired many 1900s by Martin's kits. Great kit and the instructions are very good.

The volume troubles are almost surely related to the volume meter lamps; the fact that they go on and off could mean the filament of the lamp is broken but still in contact and as it heats up / colds down it contacts and breaks contact. I have seen some light bulbs doing that just before they burn out completely. Or there might be some loose contact in the volume controller etc. but better to wait for a more precise info from Martin. 🤒

I believe the volume in the Beomaster 1900 is controlled by photo sensors ie light sensors which sit inside the light boxes where your volume display lights are located.

When your bulb goes out - ie stops working, the Beomaster is reacting to the change in light as if you had manually adjusted the volume. Indeed the volume controls on the BM1900 effectivly only control the lights in the two light boxes and it is the brightness and balance of these lights which in turn control the volume.

Replacing the faulty bulb should resolve your problem.

Andrew

It is correct that the volume control is optical with a miniature bulb and LDR resistors sitting inside a
sealed housing on the main board.
There's one housing, one lamp and 4 LDR resistors. Two LDR's handle the volume, the other two handles loudness.
(Balance control is a sliding potentiometer under the large aluminum lid.)
If the bulb inside the housing burns, a safety circuit cuts in and the Beomaster will mute completely.
If you have sound from the Beomaster, we can rule out this lamp.

The panel lamps, however, is a different story. And they are in fact real lamps, not LED's or LED displays as some people think.
The only LED is the red standby indicator.
The volume indicator "arrows" on the panel are not directly related to the volume circuit but merely indicates the setting.
It's quite common to see strange behavior if one or more front panel lamps are burned and/or are of a wrong wattage, even
the lamps for checking the bass, treble and balance controls are important to give the right load and power supply discharge
effect when going into standby.
Some Beomasters will play fine but won't be put into standby without pulling the mains plug, others
will change channels intermittently or continously, others again will do other things.
Generally, the lamps are quite critical for correct operation in these wonderful machines.

I can supply a kit containing a complete set of fresh lamps of correct wattage (plus a spare).
The kit comes with (dis-)assembly instructions and will fit Beomaster 1900 / 1900-2 / 2300 / 2400 /2400-2
Soldering and basic electronic skills and tools are required to replace the lamps.

Martin

Thank you all for your quick answers. This was very helpful.

I going to replace those light bulbs.

I'm very pleased to say, I've replaced the lichtbulbs and the Beomaster is working great again.

🙂

Good job !  🤒

Martin