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Louie
Louie, Technician
Category: Home Theater-Stereo
Satisfied Customers: 1083
Experience:  Have been in the business 25+ yrs., down to component level.
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Harmon Kardon AVR 254 powers up for 2 to 3 seconds and then

Customer Question

Harmon Kardon AVR 254 powers up for 2 to 3 seconds and then goes into standby mode. Tried placing 3.15A 125V fuses in parallel with the SR-5 Time Delay fuses near the power transformer with no help, still goes into standby mode.
Submitted: 1 month ago.
Category: Home Theater-Stereo
Expert:  Louie replied 1 month ago.

Hi Dave and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.

Initially, have you tried unplugging for an extended period of time? ...and then plugging back in and trying with no speaker/wires connected?

Customer: replied 1 month ago.
I have
Expert:  Louie replied 1 month ago.

...as well as a RESET ?

Customer: replied 1 month ago.
reset the unit as well
Customer: replied 1 month ago.
Are there Service Codes associated with these units?
Expert:  Louie replied 1 month ago.

Appreciate the additional information.

The described symptom and results of what have been tried would almost always point to an internal hardware issue.

Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?

Equally important, would you be comfortably familiar working on the internal circuitry? ...LIVE?

Customer: replied 1 month ago.
my background in electronics goes back 45 years
Expert:  Louie replied 1 month ago.

Great on the DIY!

"...Seems all DC voltages are within range..."; including the standby voltage?

Customer: replied 1 month ago.
Can we have the call tomorrow?
Expert:  Louie replied 1 month ago.

No prob; when conveniently able.