Beomaster 7000 front panel (sometimes) not working

[filip_kbh]

My Beomaster 7000 has begun to display a strange behaviour. After some time on standby, the left button will not turn the unit on again. If I then use a remote control to turn it on and then off, the front panel button wil work again. However, after some time – e.g. if I want to turn it on next morning, the button will not work again. Argh.

I initially thought it was the backup battery that needed replacement, so I did that. Same result.

Can anyone point me in a direction to what I should look for?

Of course I can just use the remote but it annoys me that the Beomaster is not working 100% as it should.

[filip_kbh]

Strange – it seems that the problem fixed itself. Now it works every time.

[Die_Bogener]

The switches can have oxidation. There ist just a switch going to the 8155 port chip, nothing elase but a cap an d a resistor.

The switch itself can have a problem. You can measure it, resistor 0 or very high.

But what helps: replacement or some current around 200-500mA… the current will clean it. But only if disassembled or the cpu will die.

Second possibility: there is a connector from the front pcb to the cpu board. The connector can have the same oxidation, but can be cleaned.

 

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