Reply to "What's Wrong With This Lionel Legacy FEF? (Video Inside)...We'll Never Know...7 MAR 2016 UPDATE...."

GGGOGR Forum Member

J1 looks like the AC input. There really is nothing that should hum. Unless it is a transformer humming because of a AC short.

If everything is disconnected including all the harness except J1. (NO boards installed on the mother board) Does it still hum? If so, I would test that black rectangle on the second picture. Top of mother board. That may be a diode/TVS that is shorted and causing a transformer hum. G

5/31/152:21 PM

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