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Thanks, BradtheRad. I now get a Dot beam when I disconnect the CRT tube pin 3 cable from the H.V psu circuit, the beam only disappears when I put it back. With the Dot beam on the screen, all the control knobs work fine but I can not get the beam to sweep horizontally on the screen not matter...
I bought Leader LBO-514A Oscilloscope, it powers on but no Trace at all. I opened it and checked the PSU voltages.
Right now, all the required voltages for Scope to work are present (ie -15,+15, 250v, 1750V HV) but still no trace . I only see a DOTTED Light which flash ONCE upon switching...
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