1970s Quasar TV won’t tune to picture

[VHFUHF]

Hello all,
I came across an old Quasar set that an acquaintance wanted to get rid of. She hadn’t really used it in awhile so I went ahead and tested it, and it powered on smoothly to some static. I’ve been messing with the thing for awhile (hooked it up to a converter box) and I can’t seem to get the picture to fully come through. I adjusted the vertical and the VHF screws, but the best I can get is still very scrambled. You can see the flashes and scrambled credits and scene transitions or when words flash on the broadcast, but that’s it. The sound comes in crystal clear though. When I change the dial to a different channel, the screen seems normal, the standard ‘snow’ comes through and there appears to be no issue with the picture.

Sadly, I cannot make out any model number on the set due to damage to the original stickers. Only thing I can really make out is that I think the set is from ‘77. I can barely make out the service number, wt5985sw, which appears to match the model number as well. I attached some pictures, any advice is welcomed and appreciated. I’d love to get some use out of this thing!

[Electronic M]

Horizontal hold/frequency is way off. If the hold control can't bring it in look at the horizontal osc and see if there is an adjustable h osc coil that will bring it in.

[VHFUHF]

Horizontal does seem way off. If it’s not turned all the way to the right it starts collapsing the picture.

[zeno]

Many Quasar / Panasonic, RCA, Hitachi of this era throw off the
hoz osc if the HV got to high. Quick test is to put it
on a variac & try the set at about 100 VAC. If it straightens out
thats the problem. Usually its a shorted pass transistor in the
main power supply.
If you get it going there are 2 other small caps that are must changes
the set. Will cover those if need be.

73 Zeno
LFOD !