Hitachi/Apple CRT No Color, Half Picture, Green Line

[coppercitycomputer]

Greetings, I will let the photos do the talking. It produces a loud high voltage buzzing noise, I heard a popping noise once and then the picture shrunk and then came back.

I would like to repair this. Thanks for any and all help. Model is M2943 15" Muilt-scan. It's made in December of 1995 from a Mac 7200/100.

[Andrew F. Ali]

Re: Hitachi/Apple CRT No Color, Half Picture, Green Line

Test all the hi-voltage 100-350V Caps in the power supply and Horizontal Output circuits....Most likely in the switching power supply circuit

[coppercitycomputer]

Re: Hitachi/Apple CRT No Color, Half Picture, Green Line

Andrew, do you mean to remove and test or just test for voltage? Were is the Horizontal output section?

[coppercitycomputer]

Re: Hitachi/Apple CRT No Color, Half Picture, Green Line

Problem solved:

Bottom half of screen has no hori sweep. LED lights both green & amber. A: C001 470uf 16v on power saving dboard on right side of chassis.