have i knacked it?! - diyAudio
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Old 13th November 2013, 03:46 AM   #1
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Default have i knacked it?!

have one of these lm4766 amps
working fine for months
i was attaching new speaker cables and let in drop a few inches and now it works but is gradulley getting hot when perviously stayed cool.
any easy solutions or am a betting just getting another!
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Old 13th November 2013, 04:06 AM   #2
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oh and ive got some distortion looks like its a gonner
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Old 13th November 2013, 04:32 AM   #3
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Try taking it back to the last known working state. If it works you know you have made a mistake.
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Old 13th November 2013, 04:37 AM   #4
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recap, been working a few months!
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Old 13th November 2013, 05:03 AM   #5
Mihkus is offline Mihkus  Estonia
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Lol... Most of these ebay amps arent ment to be used by DIYers... They just fail.
Had that Other LM4766 amp board, 45x100mm o r something... The design was so horrible that the chip oscillated like crazy and when i cranked it up at +-28V and with 8 ohm load it just started smoking.
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Old 13th November 2013, 05:09 AM   #6
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YEA I GUESS sounded good though
running 18v as studio monitors went loud and clear
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Old 13th November 2013, 05:11 AM   #7
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should have stuck with my nodded ta2022 plenty loud enough when .5m away!
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Old 13th November 2013, 07:09 PM   #8
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idiot!!
i have external crossovers on my diy studio monitors as i plan active dsp later.
i mounted the crossover pcbs together for tidyness on steel risers
must have shorting speaker outs!!!!!
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Old 15th November 2013, 10:01 AM   #9
AndrewT is online now AndrewT  Scotland
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The "drop" make have overstressed a connection.
Take the assembled PCB out of the case and resolder all the component pads.
Check to find and repair any cracked traces.

The big capacitors are the most likely to have broken their solder pad connection.
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Old 15th November 2013, 11:43 AM   #10
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thanks andrew but its now fine
as per previous post i was shorting(i think) the crossovers (on pcb's )!
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