How can I test power generator in the PCB of CRT TV?

[bshi02]

Hello.

I tried to fix CRT TV(21fu1r-ns of 220 voltage) which I got from a recycling bin.
Unfortunately It is impossible to power on this CRT TV.

So I dismentled this CRT TV, and I found that its fuse never have been blown and Voltage of big capacitor(main filter capacitor) is 315v and It seems that this big capacitor barely discharged after a couple of days.

I successfully detached all of its PCB from cathode ray tube, and I measured all of resistor in HOT area and compare its value to each resistor in the MC059C schematic. which is the same part number with CRT TV's PCB I have.

https://i.redd.it/m0b68t9i9drc1.jpg


It seems that all of resistor in HOT area is somewhat the same with each resistor in the MC059C schematic.

So I need to test power regulator of STR-W6754 whether it really works or not.

But I heard that, In order to power regulator in CRT TV's PCB, I have to switch on CRT TV.

Is there any method to test power regulator in CRT TV's PCB whitout swtching on?

And Should I connect all of connector in the PCB to cathode ray tube before I switch on?

If I switch on CRT TV's PCB without connecting any connector to cathode ray tube, Then It would cause broke down or burst in CRT TV's PCB?
Any reply would be appreciated.

[inse]

I suggest to leave everything connected.
Start checking the supply voltage of the controller circuit IC801.
There’s a diode and two resistors from the bridge rectifier, those make the startup supply (can’t read the reference numbers).
I don’t have the datasheet of it, but I would expect something like 12V at the IC pin.
As the main capacitor is not discharged in days, I suspect that possibly one of the resistors is broken.
Be careful probing the live circuit, best practice would be having an isolation transformer.