mrtiv Posted January 28, 2020 Share Posted January 28, 2020 My Lowdown LD 150 powers on with a nice thump but there are no lights and none of the controls work. There is a light buzz from the speaker and plugging an Ipod into the 3.5mm jack produces sound (but still with no control from the front panel). The two input jacks on the front panel don't work at all. I've had a look inside, tested all the voltages I could with a digital multimeter and they checked out fine. I wasn't able to definitively check any capacitors but visually they looked ok. An internet search revealed at least two other people with exactly this problem but no solution. So..... any ideas? Quote Link to comment Share on other sites More sharing options...
mrtiv Posted February 3, 2020 Author Share Posted February 3, 2020 After a bit of disassembly and investigation, I found that the PCB shield on the passive input jack was loose and behind it, a ferrite bead: L5 had blown. No idea how or why, or if replacing it will fix the problem.... but at least I'm a bit further down the road :) Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 3, 2020 Share Posted February 3, 2020 Bass guitar with active 9-Volt powered pick-ups? Quote Link to comment Share on other sites More sharing options...
mrtiv Posted February 3, 2020 Author Share Posted February 3, 2020 I have a Westone Thunder 1A, which is powered by 2 x 9-Volt batteries.... but I always used the active input with that bass. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 3, 2020 Share Posted February 3, 2020 Two 9-Volts might be too much. Would need to know more on how the circuit is implemented. In the meantime, it should be checked out by a Line 6 authorized service center who knows the product to check that. Looks like chassis ground issue. https://line6.com/find/service_center/ Or Mark Wright Music in Northampton,... he used to be a repair tech at Line 6 Rugby when we had a location there. Quote Link to comment Share on other sites More sharing options...
mrtiv Posted February 3, 2020 Author Share Posted February 3, 2020 Thanks for your help. It seems strange to me though that an active bass should be the reason, even if it were to be accidentally plugged into the passive input. After all, I've had that bass since 1982 and it's been plugged into many different bass amps of varying types over the decades with no problem. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 3, 2020 Share Posted February 3, 2020 Don't know if it's the reason, but an intermittent chassis ground wouldn't help. Quote Link to comment Share on other sites More sharing options...
amyzany101 Posted June 17, 2021 Share Posted June 17, 2021 Thanks for the info. I have the same problem and are figuring out how to fix. Quote Link to comment Share on other sites More sharing options...
Ninteen66 Posted December 3, 2023 Share Posted December 3, 2023 Hello all, I receive my LD15 x 8" yesterday via Fedex from Cali (brand new). I open the box, come to find it only came with an I-Type (Argentine) power cable. I went to the store to grab an adapter. I plug the amp in to US power, turn switch on and nothing. No light, no volume, nothing. I plug my Fender Squier bass into input jack with a new balanced cable...still nothing. Any suggestions? Quote Link to comment Share on other sites More sharing options...
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