How to fix your subwoofer amplifier 7L2T-18C808-AA
05-01-2019, 01:53 PM
#11
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Factory sub plug in
I have a 2005 f 150 lariat but i recently bought a 2006 factory head unit with mp3 but it does not have the factory sub plug in on the back of it. My truck has the factory subwoofer in it but since the headunit doesn’t have the plug in for it, is there any other way to plug the sub into the head unit?
07-08-2019, 05:22 AM
#12
fixing amplifier cutting out
wow I was dealing with my oem amplifier cutting out. when my amplifier would cut out i would turn the radio off and then back again and I would work for a bit longer then It would cut out again it was really hard task to find until i found this post i took the amp a part and just touch the solder points that were on the photo above and it finally woks how it should of thanks to the post I save some money I didn't want to spend. the truck I did it on is a 07 Lincoln mark lt.
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patpend (07-15-2019)
07-14-2019, 10:55 PM
#13
The OEM subwoofer amp p/n 7L2T-18C808-AA is used on a number of Ford models including the F150, Mark LT, and Edge. Eventually a lot of these units fail when the subwoofer starts cutting out randomly while driving. Turning the head unit off and on again can restore the signal temporarily, until the speaker cuts out again. After the usual searching it seemed the fix was to buy a new amp from Ford to the tune of $100. I decided to try to fix the old amp before forking over the cash.
I suspected the problem was a bad solder joint on the circuit board. Usually it's the larger high-current and/or mechanical load-bearing solder joints that fail, so I resoldered all those joints first, with no improvement. So, with the amp apart and plugged into the harness and playing music, I started smacking every component with the back of a small screwdriver until I found the one that killed the amp every time. Turned out it was one of the small capacitors near the speaker output connector. Touching up those solder joints fixed the problem. It's beenabout a week now over five years with no cut-outs so I feel pretty good that it's fixed once & for all.
Pics show the problem areas. If you have basic soldering skills, this is a pretty simple fix. Hope this helps someone.
-Russ
I suspected the problem was a bad solder joint on the circuit board. Usually it's the larger high-current and/or mechanical load-bearing solder joints that fail, so I resoldered all those joints first, with no improvement. So, with the amp apart and plugged into the harness and playing music, I started smacking every component with the back of a small screwdriver until I found the one that killed the amp every time. Turned out it was one of the small capacitors near the speaker output connector. Touching up those solder joints fixed the problem. It's been
Pics show the problem areas. If you have basic soldering skills, this is a pretty simple fix. Hope this helps someone.
-Russ
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patpend (07-15-2019)
07-15-2019, 09:27 AM
#14
10-22-2019, 05:12 PM
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Fix subwoofer
The OEM subwoofer amp p/n 7L2T-18C808-AA is used on a number of Ford models including the F150, Mark LT, and Edge. Eventually a lot of these units fail when the subwoofer starts cutting out randomly while driving. Turning the head unit off and on again can restore the signal temporarily, until the speaker cuts out again. After the usual searching it seemed the fix was to buy a new amp from Ford to the tune of $100. I decided to try to fix the old amp before forking over the cash.
I suspected the problem was a bad solder joint on the circuit board. Usually it's the larger high-current and/or mechanical load-bearing solder joints that fail, so I resoldered all those joints first, with no improvement. So, with the amp apart and plugged into the harness and playing music, I started smacking every component with the back of a small screwdriver until I found the one that killed the amp every time. Turned out it was one of the small capacitors near the speaker output connector. Touching up those solder joints fixed the problem. It's beenabout a week now over five years with no cut-outs so I feel pretty good that it's fixed once & for all.
Pics show the problem areas. If you have basic soldering skills, this is a pretty simple fix. Hope this helps someone.
-Russ
I suspected the problem was a bad solder joint on the circuit board. Usually it's the larger high-current and/or mechanical load-bearing solder joints that fail, so I resoldered all those joints first, with no improvement. So, with the amp apart and plugged into the harness and playing music, I started smacking every component with the back of a small screwdriver until I found the one that killed the amp every time. Turned out it was one of the small capacitors near the speaker output connector. Touching up those solder joints fixed the problem. It's been
Pics show the problem areas. If you have basic soldering skills, this is a pretty simple fix. Hope this helps someone.
-Russ
now since 2 years I have bass in my Ford Edge !!
perfect !!!
08-15-2023, 04:53 PM
#16
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It works!
I re-soldered each of the 10 leads on those 5 capacitors which were encircled in the photo, and BOOM!!! I'm not even any good at soldering either haha. I managed without any real struggle at all. Easy fix. Thank you thank you for tinkering and then posting!
