Hey Folks
Have an amp here that's not coming out of standby / or going into protect.
Relay clicks when power button is pressed but led doesn't go green and no output.
Pics of board and schematic attached.
Any pointers on methodical fault finding would be a help
Only thing I noticed on the board - looks like got hot around the 'remote' connector - I've reflowed the four resistors R426 R427 R428 R169 and transistors Q404 and Q405 which also tested as expected with a DMM.
I have component tested the momentary buttons and the the two IRF740 mosfets which are ok.
Looks like the irs2153D is there as a gate driver to protect the fets anyway, and boom I'm suddenly out of my depth on this one. I'm trying to dredge up knowledge I had many years ago but haven't practised in sometime.
Haven't got a scope here, just a DMM and a reflow station.
Any help or pointers greatly appreciated.
Have an amp here that's not coming out of standby / or going into protect.
Relay clicks when power button is pressed but led doesn't go green and no output.
Pics of board and schematic attached.
Any pointers on methodical fault finding would be a help
Only thing I noticed on the board - looks like got hot around the 'remote' connector - I've reflowed the four resistors R426 R427 R428 R169 and transistors Q404 and Q405 which also tested as expected with a DMM.
I have component tested the momentary buttons and the the two IRF740 mosfets which are ok.
Looks like the irs2153D is there as a gate driver to protect the fets anyway, and boom I'm suddenly out of my depth on this one. I'm trying to dredge up knowledge I had many years ago but haven't practised in sometime.
Haven't got a scope here, just a DMM and a reflow station.
Any help or pointers greatly appreciated.
Attachments
as above I think they've got hot - not sure if replaced.
besides Ive reflowed and tested them and they test out ok with my dmm - values match schematic.
besides Ive reflowed and tested them and they test out ok with my dmm - values match schematic.
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