Sinclair ZX80 / ZX81 / Z88 Forums

Hi Gozzo,

I mean a scart adapter with the Y/R/W inputs where to hook up the composite cable. Well I found one in a drawer and tried to connect Speccy with this one. I have in fact an issue but completely different. Now colors are displayed correctly but the image is rolling down to up quite rapidly and cannot stop. (mising sync??)

Hi have checked the menu and there is no options to change pal/ntsc refresh rate. This TV is more a PC screen and I got it for free a couple of years ago. Better for me to find one working good than trying to fix it.

weird! try fitting a dc isolating cap in the composite feed as the dc level straight out is a tad high, some have had trouble with sync cured by isolating cap, 100uf 16v should do nicely, positive to modulators input pin, negative to composite out...

Hi Gozzo,


Any schematic to clearly guide me on where to solder the capacitor?

well, however the composite mod has been done, just wire the capacitor in series with it, on the signal side, not ground...

found this pic on the net..not really necessary to do the 2 cuts...

Hi Gozzo

Ok got it thanks
I will try with the capacitor and see results.

Hi Gozzo,

Have soldered the capacitor but no changes and still the image rolling rapidly. I will get rid of this LCD screen and invest in a better one