When I push the On buttom the front relay made a noise , the +15 volts inhibit voltage change like the service manual said or going lower. The PS gives only 15v for the starting inhibit circuit , nothing more now,
this 15 volts is only for the starting PS , is explain here in POWER SUPPLY WONT POWER ON search
The signal to start is going in series with the PCB or cards that means that one is disconected is imposible to start the PC OSD ,
To test better the PS the service manual said to put a 200 ohms in the small connector PS white cables simulating the PC and if the PS does not start to give the 5vols 12 v plus and minus replace the power supply PS.
When I put the resistor the same I heard the relay click but any ps voltages out , the H Voltage dc in the PS is present but later this 250 volts is not converted in 12 -5 volts is very difficult to check the vertical card in the PS ,somebody here in the link PS WONT POWER ON put a 5 volts power supply extra in the original PS Connector and start the OSD like the cars in batery failure!
the PS vertical control card has to many components condensers chips, transistors, difficult to repair ,nothing is burnt
the modele is HP54845A Windows 95 ,
also in the Service manual said to check the resistencia to ground in the OSD , it seems ok.
I Have one PS from the old PC chinese that gives all the voltages when one start cable is connected to ground ,only problem s is the power only 200 wats ..and the conexion like a heart transplant
there are tips here for others hp PS models : the resistor x 330k , the fuse resistor in the power transistor , nothing for this PS ,
in resume I need to buy an expensive old PS , Change the condensers etc or put a new PS WITH NOT MISTAKES!
Thanks