Repairing a jbl 1201.1II...

caraudiobum · 05:39 PM

I have a JBL 1201.1II monoblock car subwoofer amplifier I bought it off of ebay 'like new' but it came fried.

They refunded my money (yay) and now I'd like to try my hand at fixing it. I am a complete novice, so I might need some baby talk... Symptoms: when hooked up to power, either 1. The "power" led is off, and the "protect" led is solid on, or 2. The "power" led is solid on and the "protect" led blinks fast (so fast it never appears to reach full brightness). Some components become very hot and start to smoke. No sound comes out at all. There are no apparent burn marks, though one side of the board has been apparently wiped clean with alcohol or something (looks new). The other side has a whitish residue all over it. Is this from blown electrolytic capacitors (mosfet), perhaps? The fuses are intact (though they could have been replaced). The plastic around where the fuses attach has been melted somewhat. From this information, does it sound like it is repairable? edit: I have the service manual (with complete schematics)- pm me with an email if you want it. It is also available online with a quick google search.

Tekko · 06:09 PM

I think this thread would fit better in the car audio section. And it appears to be a class D amplifier by looking in the service manual, so it'd be quite a bit more difficult to repair than a class AB amplifier.

caraudiobum · 22nd July 2011, 05:23 PM

Sorry about that, I didn't see that forum. I moved it to the car audio forum, adding that it is a class D amp. Thanks

18th July 2011, 05:31 PM	#1
caraudiobum diyAudio Member Join Date: Jul 2011	Repairing a jbl 1201.1II... I have a JBL 1201.1II monoblock car subwoofer amplifier I bought it off of ebay 'like new' but it came fried. They refunded my money (yay) and now I'd like to try my hand at fixing it. I am a complete novice, so I might need some baby talk... Symptoms: when hooked up to power, either 1. The "power" led is off, and the "protect" led is solid on, or 2. The "power" led is solid on and the "protect" led blinks fast (so fast it never appears to reach full brightness). Some components become very hot and start to smoke. No sound comes out at all. There are no apparent burn marks, though one side of the board has been apparently wiped clean with alcohol or something (looks new). The other side has a whitish residue all over it. Is this from blown electrolytic capacitors (mosfet), perhaps? The fuses are intact (though they could have been replaced). The plastic around where the fuses attach has been melted somewhat. From this information, does it sound like it is repairable? edit: I have the service manual (with complete schematics)- pm me with an email if you want it. It is also available online with a quick google search. Last edited by caraudiobum; 18th July 2011 at 05:39 PM.

18th July 2011, 05:58 PM	#2
Tekko diyAudio Member Join Date: Jan 2005	I think this thread would fit better in the car audio section. And it appears to be a class D amplifier by looking in the service manual, so it'd be quite a bit more difficult to repair than a class AB amplifier. __________________ The point of life is to build atleast one audio amplifier before you die. Last edited by Tekko; 18th July 2011 at 06:09 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
TAD 1201 horn ?	dede	Multi-Way	40	20th September 2011 01:10 PM
WTB: TAD TM-1201	pengesluk	Swap Meet	0	17th March 2011 03:49 PM
Help for my Ah Tjoeb and VAM 1201	greenink	Digital Source	1	6th March 2011 07:11 PM
TAD 1201 Midbass	homebuilder	Swap Meet	4	8th February 2011 04:09 PM
FS: Blueprint 1201	Jean	Swap Meet	0	3rd June 2006 06:29 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

22nd July 2011, 05:23 PM	#3
caraudiobum diyAudio Member Join Date: Jul 2011	Sorry about that, I didn't see that forum. I moved it to the car audio forum, adding that it is a class D amp. Thanks

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)