Casio CZ/ VZ/ FZ - Pro Series

Had 50% success replacing transistors - I managed to reclaim the MIDI output - which I think was due to replacing the tranny on the socket board driving the output. Someone has obviously been there ahead of me as the MIDI socket has been rewired to the tracks presumably thinking that the socket had come away from the  board.
I had replaced T7/T8 also which is the LED power but this does not seem to have helped the display. I am fairly certain now that the CPU is operational as all functions are working - just no display.
I am finding it hard to believe all the transistors (T19....) in the display matrix are faulty,but the CPU seems to be generating output signals,so either they are - or I didn't do the power ones correctly. I am fairly certain I did however - so are these other trannies at the display end the ONLY possibility of failure?
Any ideas?

LEE
      From: "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com>
 To: CZsynth@yahoogroups.com 
 Sent: Friday, 23 October 2015, 13:46
 Subject: Re: [CZsynth] AZ1 repair
   
    Then I would start to check all circuits delivering the power - there's one for digital circuits, another one for analog circuits, third one for LEDs. Maybe something is wrong there.
Service manual describes some voltage settings on page 28, and troubleshooting starts on page 30.
Daniel Forro

On Oct 23, 2015, at 9:39 PM, Lee Borrell templarser@yahoo.co.uk [CZsynth] wrote:


Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power.
I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.