eletrolegal Posted May 30, 2018 Share Posted May 30, 2018 I have a amplifi 150, it have sound only when I use effects or reverb. If turn off reverb and FX, no sound. Quote Link to comment Share on other sites More sharing options...
christianldiaz Posted August 5, 2018 Share Posted August 5, 2018 hola, me pasó lo mismo, encontraste la solucion?????? Quote Link to comment Share on other sites More sharing options...
rdownings Posted August 10, 2018 Share Posted August 10, 2018 Had the same problem. It is the power supply board in the bottom of the amp. It is 2 power supplies in one. One side is for the amp to the 12" speaker, and the other side goes to the amp for the 2 smaller left and right speakers. You have to replace the whole power supply board. Buy it at Full Compass. The components used in these amps are low quality. Just enough to meet the specs to make them work. This is what happens when they outsource overseas. No quality control. If they can make it cheaper by putting in 1/10th of a penny cost, than spending a 5 cents on a component to make a board, they do it. As long as it meets the specifications, they do not care. This is why these amps fail. Cheap parts with low tolerances. 1 Quote Link to comment Share on other sites More sharing options...
rdownings Posted August 10, 2018 Share Posted August 10, 2018 Forgot to mention that it is easy to fix the Power Supply issue if the following is observed: Take the back plate off the amp slowly, look for the wires that go from the main amp board (attached to the large heat sinks, 3 wires: black, red, and green). Look where they go to on the Power Supply PCB (5 screws takes the board out). Behind those wires on the main white connector, there are two capacitors side by side. They look the same. If they are brown in color, that is what is blown. This is the same crap that Yamaha uses on their systems. The capacitors are cheap and will fail eventually or sooner depending on voltage fluctuations, heat, and where you use the amp (poor voltage filtering, etc). Rather than sending it to Line6 for repair that takes weeks or months as they say, or send it to an authorized service center that will charge you a lot, take the amp to any good local electronic repair service and tell them what I told you. They should quickly see and repair. Replace with higher quality capacitors with better tolerances. Your other option is to buy a new Power Supply from Full Compass and just swap it out yourself (it's not hard). Have the defective board repaired as a backup. I have been down this road with Yamaha PA systems and amps, Line 6 powered speakers and amps many times. Always the same thing. They cheapen the components to save money. Since they sell thousands of product, they would rather spend 1/10th of a penny than $.50 per critical component to maximize profits. As long as the cheap part works, who cares? Quote Link to comment Share on other sites More sharing options...
Roadster72 Posted February 20, 2020 Share Posted February 20, 2020 Any chance you know the value of the capacitors and or at what rate they should drop if at all. I feel I could change them myself and would like to give it a try. Thanks in advance Quote Link to comment Share on other sites More sharing options...
lisapnv Posted June 6, 2021 Share Posted June 6, 2021 If you speak about the 2 largest capacitors: specifications for both are 680µF (microFarads) - 200Volts - 105°C. Problem is that they are snap-in type instead of radial, so that they are more tricky to remove but it remains feasible by yourself. If you order new ones, I recommand to take radial and not snap-in, because I received 2 snap-in few larger than originals and it is tricky to place (few place). Radial are mostly smaller in diameter (and they are more reliable and cheaper). Important to notice: In my case, I had the same problem: no sound (at all) but all buttons/bluetooth/... are working fine; Last firmware (2.60) installed. After replacing those capacitors, no change => no sound. I'm not sure that this is always the same defective component. So please, be sure that your capacitors are burned (= damaged or leaking). Tip (for myself): I see that even minijack input is inoperative (no sound) and that even tuner doesn't receive any signal => I exclude for the moment a general power failure Regards & Good luck Quote Link to comment Share on other sites More sharing options...
Richard744 Posted September 6, 2021 Share Posted September 6, 2021 I have also same issue any suggestion for this issue so please reply. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Marcus48 Posted November 27, 2021 Share Posted November 27, 2021 Anybody get any good solution, I think I am facing similar kind of problem. tellthebell Quote Link to comment Share on other sites More sharing options...
velocis Posted January 3, 2022 Share Posted January 3, 2022 I had a similar experience with an Amplifi 150, just sound out of the tweeters no woofer. Here was my diagnosis path, big thanks to @rdownings for a good starting point. So I unscrewed the rear panel, inspected power pcb and woofer amp pcb couldn’t see failed components, so removed the power supply board at the bottom, put the connectors back on and ran it outside the case and checked and had all the voltage rails , +-45v +-19 and +8v, same issue. Was going to swap out the woofer amp board as I have 2 150’s but decided to check all the audio signal cables and connectors and it started working, so might have been un seated connector or could still be dry joint while knows, but it’s working. But yeah think checking voltages off power pcb before removing it is the fastest thing, then audio connectors , and then amp module. I got lucky ! 1 Quote Link to comment Share on other sites More sharing options...
cbrillow Posted January 23, 2022 Share Posted January 23, 2022 Good info, velocis -- may help out someone one of these days! Congratulations on solving your problem. Quote Link to comment Share on other sites More sharing options...
velocis Posted February 7, 2022 Share Posted February 7, 2022 FAILURE AGAIN Had it setup on the weekend on bluetooth from the phone, pumping out about 1/3 volume and then music disappears, all lights where off on the amp. Switched off and on again and it came back but missing the woofer again. Back to square one, might just try replacing the caps and giving it a resolder and see how we go Quote Link to comment Share on other sites More sharing options...
jangesle Posted September 27, 2023 Share Posted September 27, 2023 On 6/6/2021 at 12:55 AM, lisapnv said: If you speak about the 2 largest capacitors: specifications for both are 680µF (microFarads) - 200Volts - 105°C. Problem is that they are snap-in type instead of radial, so that they are more tricky to remove but it remains feasible by yourself. If you order new ones, I recommand to take radial and not snap-in, because I received 2 snap-in few larger than originals and it is tricky to place (few place). Radial are mostly smaller in diameter (and they are more reliable and cheaper). Important to notice: In my case, I had the same problem: no sound (at all) but all buttons/bluetooth/... are working fine; Last firmware (2.60) installed. After replacing those capacitors, no change => no sound. I'm not sure that this is always the same defective component. So please, be sure that your capacitors are burned (= damaged or leaking). Tip (for myself): I see that even minijack input is inoperative (no sound) and that even tuner doesn't receive any signal => I exclude for the moment a general power failure Regards & Good luck Hiya. did your "tip to yourself" yield any results. I am experiencing exactly the same symptoms with my amplifi 75 Quote Link to comment Share on other sites More sharing options...
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