Strong Switcher "Main Mod" Error Failure Mode

[Ryan Gallagher]

Thanks Tony. I think I'm leaning towards caps/fuses first repair attempt. We have 3 functioning and 4 with issues. If I can get up to speed servicing these we may be good for a while for our single screen.

I was already headed down your advice path in my datasheet comparisons for replacement caps. Size and leg pitch seem to be the gotchya to avoid, all the rest is easily searchable on Digikey etc.

As far as the fuses in these. Are they generally slow-blow or fast-blow ceramic fuses? I'm guessing fast-blow based on the ceramic look... but minimal markings on mine other than the rating.

[Tony Bandiera Jr]

Thanks Tony. I think I'm leaning towards caps/fuses first repair attempt. We have 3 functioning and 4 with issues. If I can get up to speed servicing these we may be good for a while for our single screen.

I was already headed down your advice path in my datasheet comparisons for replacement caps. Size and leg pitch seem to be the gotchya to avoid, all the rest is easily searchable on Digikey etc.

As far as the fuses in these. Are they generally slow-blow or fast-blow ceramic fuses? I'm guessing fast-blow based on the ceramic look... but minimal markings on mine other than the rating.

For fuses, the 3 character marking (AGC, 3AG, MDL, etc.) will tell you if it is fast acting or slo-blow.

In the 1/4 x 1.25 inch fuse sizes, ceramics marked ABC are fast, and MDA are slow. (Cooper fuses) Other manufacturers may use different markings.