Hello all,

I recently purchased a broken 54520A hoping to be able to repair it.
The seller said that the screen was faulty. However, after the
oscilloscope arrived, I saw very soon that the problem was not the
screen but something else.

When the oscilloscope boots, the fan turns on and all the indicators
on the front pannel light-on. But it hangs there. No keyboard response
and nothing displayed on the screen. However, the screen is working,
as when I turn off the device, sometimes I can see the beam on the
display and some noise.

The indicators keep lighted on until you turn the oscilloscope off
again.

Could anybody help me? Its a great oscilloscope, but it just does
not work :-(

Juan