Repair log: Sony PVM-14L3

[netimmerse]

Monitor was sold for cheap with the following issues - powers on, no vertical/horizontal drive and no EHV as a result.
A spare working deflection board assembly (D+D1) allowed to deduce the problem being on D board.
Scoping vertical IC showed vertical pulse appearing for less than a second after turning the monitor on, measuring +5V power supply to D1 board (deflection control) showed voltage dropping to 1.5-2V at the same time.

The culprit - faulty 7805 voltage regulator (IC1502) on D board stepping down voltage from 12V to 5V solely for D1 board power supply.

 

[Retro Mecano]

Great saving!

I have a PVM 20m2e which i struggle to fix since mor than 2 years..

I searched and post threads everywhere but without succes.

I don't know how good you are at PVMs, but i'll try to ask anyway, becausr i am still a novice. Do you mind if you hekp me out figure out whats wrong with it?

Thanks in advance!

 

[netimmerse]

I have a PVM 20m2e which i struggle to fix since mor than 2 years..

If this is about the monitor not showing any inputs - get a scope, read the service manual and trace the input signal wherever it is supposed to be. Without proper tooling this will not be very fruitful/

 

[Retro Mecano]

If this is about the monitor not showing any inputs - get a scope, read the service manual and trace the input signal wherever it is supposed to be. Without proper tooling this will not be very fruitful/

Well it seems every road lead to the oscilloscope. Damn i am just learning to use a probe.

Now an oscilloscope..