20 Most Recent JBL LSR-4312SP Active Subwoofer Questions & Answers

Question edited for clarity, proper 'make model (what it is)'. I can't find a manual, but they have a common theme. Remove the faceplate and press the Reset Button, then clean the contacts both sides with electrical switch cleaner or Isopropyl Alcohol. https://www.premiumleisure.com/Manuals/nov07/Hydro_Spa_JBL_Stereo.pdf https://www.rocktheboatmarinestereo.com/specs/MR18.pdf https://www.google.com/search?q=JBL+marine+MR-15b+manual ..

It sounds like the internal battery has failed. Try and claim on the warranty or ask for a repair.

JBL Support - Returns & Warranty

JBL https://ca.jbl.com > support-returns-and-warranty If you believe your product is malfunctioning during the warranty period, we can help!

Warranty

JBL https://ca.jbl.com > warranty Unless a different warranty period is stated in the Warranty Card provided with your JBL product, JBL warrants for a period of 1 year (5 years for any non- ... Troubleshooting help https://www.ifixit.com/Wiki/JBL_Charge_4_Troubleshooting JBL Charge 4 TroubleshootingiFixithttps://www.ifixit.com > Wiki > JBL_Charge_4_Troub...Make sure the charging light on the base of the device is blinking. If it is fully charged and still not turning on, the power button may be worn out or broken. ‎The Speaker Will Not Power... · ‎The Device Won't Connect to.....

Hi, it's sound like you've done your best and from my pov, you're not missing anything but just need to get the subwoofer repaired by the manufacturer or completely replaced. Thank you.

that humming sound 60Hz is a hint of short. inside it needs to be repaired in a shop. a shop can fix it. you have no tools or parts or tech skills to fix it inside. right? so get it to a shop or buy the service manual and have at it. find the short. (top cause bad CAPS)

Finding diagrams or service information is getting almost impossible to find anymore

Access free Product Manuals. Safe download. findproductmanuals.com I’m happy to assist further over the phone at https://www.6ya.com/expert/latoya_8ed1bf3dc615c15d

You are right about the caps. if the unit has a seperate power supply it would be better to replace it, you may also have trouble getting into the case if it is sealed well. It could also be a bad diode etc.

Go here and try the reset upgrade. http://electronicshelponline.blogspot.com/2014/09/factory-resetsoftware-update-dsp.html?m=1

go to http://www.partselect.com/God bless you

The most obvious reason is an overheating issue in the Power Supply board. There are other ideas here, but you need to take it to a television engineer to diagnose https://www.google.com/search?q=television+will+suddenly+turn+off+every+4+minutes ..

Check the internet connection. The television can't update if it can't see the internet. Resetting it breaks the previous settings. Just for fun, reboot the router as well and wait 15 minutes until all the lights come back on. Then reestablish the television connection to the router. Harwa is not a make we know here in North America. https://www.google.com/search?q=Harwa+Smart+television.+How+to+restore+Apps ..

general steps: Get the TV remote control and push the "Menu" button and select "Options". Select "Child Lock" from the "Options" list. On some televisions, the "Child Lock" is named "V-chip". Choose the "Remove Child Lock" selection. Highlight this and then hit the "Enter" button. Enter the four-digit code that you used when you activated the child lock feature. If you cannot remember it, your only option to deactivate the child lock is to reset the TV. The instructions for resetting a TV is written on the user's manual of the TV. Exit the TV menu once you have entered the four-digit code. To do this, press the "Exit" or "Menu" button on the TV's remote control. If you don't have a remote, you might try leaving the TV unplugged overnight. Some TVs will 'forget' their settings if left without power for a long period. You could also potentially buy a cheaper universal remote, and use that to turn off the child lock.