Re: hp 1908w monitor inverter problem

Monitor is still operational.It's working few days for a at least 8 hours at day.
I will try suggested test.
After first post I tried powering on monitor without any lamp connected,Inverter powered and it was worked same,going off after 2-3 sec.
After that inverter power supply disconnected by removing l coil on +18v,under load 13,5v.
I was noticed,squealing sound from right top corner of panel,near by is t-connector board.Sounds like leaking voltage is this area,but this board is connected only with cable from video...

After first start monitor works few minutes (5 max) then brightness start to blink weaker-stronger,until light goes off completely.
when turn off and power on again monitor light is working only 3 sec.
All capacitor's have been removed and tested,all are good.
All tubes ave been tested with laptop inverter in two hours operation.all of them independently
All capacitor's have been changed with new one's.no change
Transformers have been removed,for secondary windings test.measured 625 ohm both.
On off signal is present and constant on qz9938 pin 10,
...