1995 Toshiba TIMM MM20E45 Loss of sync?

[NJRoadfan]

I have the schematics, which show what the waveforms should be in TV mode and in VGA mode at various points around the sync circuit. What I don't have is an oscilloscope, which I'm going to have to rectify.

I can't imagine too many techs knew what to do with these sets when they came in for repair back in the day. Unless they were already working on computer monitors, they wouldn't be familiar with multisync circuits. Toshiba's technical training manual goes into great detail how the sync circuit works as a result. They designed the thing as a standard TV chassis and grafted on the RGB port and multisync drive. At times they note similarities to other Toshiba TV chassis.

Almost forgot. The OSD isn't stable even when the set is in "free run" with no signal input.

[zeno]

Hoz freq is off. If this set has 1 or 2 small sub boards pull &
resolder them. the pins get cold joints. If not dig into the
hoz osc. Sync & H. AFC usually cause a floating pix with one bar.

73 Zeno
LFOD !