LIL Wonder II LW2.240 Not working - diyAudio
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Old 28th May 2013, 04:48 PM   #1
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Default LIL Wonder II LW2.240 Not working

I have this amplifier that a friend dropped off and if I hook up a power supply to it, no LED light and he says there is no sound. I pulled the unit apart and found the output transistors melted on the one side along with the resistors leading up to it. If I replace these, is there anything else I should be replacing at the same time? Do I need to power the unit with the remote hooked up to get the LED to come on or should it come on with just power and ground. The transistors are K-B688 and K-D718.
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Old 28th May 2013, 07:17 PM   #2
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When powering up for testing use a limit resistor or 5-10amp fuse on the B+. That will prevent any damage to the new components in case something else is damaged. I would check for any high temperatures on the IC's and transistors (see if any get hotter than others and how quickly) once power is applied.

As for the remote, test it both ways (with and without). I don't think amplifiers that have the optional bass remote actually need it to function.
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Old 28th May 2013, 10:19 PM   #3
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The two output transistors are B688 and D718. Does anybody have a cross-reference or source for these transistors. Does anybody have a good source of datasheets that you don't have to jump through a bunch of hoops for?
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Old 28th May 2013, 11:37 PM   #4
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You have to apply 12v to the remote terminal.make sure the next channels have
no problems befor you oder parts
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Old 29th May 2013, 12:25 AM   #5
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-120V -8A 80W Bce Kec Transistor Sc-65 | TOSHIBA | Distributed By MCM

They should have its pair as well. Like ian33 mentioned, you have to make sure how many components you need before ordering.
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Old 29th May 2013, 05:05 AM   #6
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I replace all outputs as a matter of habit. Will also be checking all transistors before ordering. Thanks for the responses guys. I checked these out and they cross to 2SB688 and 2SD718 or NTE36 & NTE37.
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Old 29th May 2013, 01:27 PM   #7
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Those are not correct, use original (same component part number). Not to mention those are like 12bucks each, lol.
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Old 30th May 2013, 04:27 AM   #8
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For the B688 and D718 output transistors The FJA4213 and FJA4313 will be good replacements for them..

Ive used them in many amps that use the B688 and D718's and have had no problems at all
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Old 30th May 2013, 05:25 AM   #9
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Jeanious, where are you getting my information from? I have looked these up in several ways and keep coming up with NTE 36 & NTE 37 as a matched pair. I don't doubt what you are saying, I would just like to be enlightened as to where one goes to find the correct info because I can't find anything with the original numbers on it except for Google images. Even the suppliers I called cross to these numbers. The specs seem a little higher but close.
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Old 30th May 2013, 01:10 PM   #10
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D718- 120V 8A 80W Bce Kec Transistor Sc-65 | TOSHIBA | Distributed By MCM
B688- -120V -8A 80W Bce Kec Transistor Sc-65 | TOSHIBA | Distributed By MCM

Those are exact replacements, listed above. The NTE36 & NTE37 are different case (TO-66), while the ones you need are SC-65. Am not using any cross reference webs, I simply look at the datasheets and quickly realize their different packages/case. While some webs will give you a different case package (as they think you have a new design and can switch package style before making/manufacturing) so they give you the NTE subs, which are NOT suitable replacements at all for your amplifier.

S-Merlington just gave you some good subs, if he says he's used them before with no issues...then I believe him and I suggest using his recommended subs. Thanks Merlington for your input.

Last edited by evianamp2011; 30th May 2013 at 01:13 PM.
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