Another TDS220 died

[tof123]

Hello guys

i am new to the forum and this is my first post.

I have got an old, but still good TDS220 from tektronic.
Unfortunatelly, the PSU board seems to be not working at the moment.
I have noticed some of the transistors driving the transformer of the backlight are baddly fried, and are not any longer readable .

The board is not powering up any longer either, but i am suspecting the primary stage to be faulty and plan to replace the power MOS transistor, but this is for later.

my question is, would anyone know the references of what looks to be transistors Q1 and Q2 or Q2 and Q3 next to C24 capacitor

the board is rev F/G.

Thanks for the help.

[oPossum]

On a Rev D/E board
Q1: 3N90
Q2,3: 2SC3205

[tof123]

great ! thanks a lot.
i'll order parts to fix it !