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pbotz2000

Help Running A Mr Christmas Box With Modified Aux Input...

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using a 4 yr old mr christmas box for my display. The person i bought it from had added an aux jack underneath for the fm transmitter. The speaker was working fine. i hooked up the aux jack to my whole house transmitter and raised the volumn on the mr christmas since it was very low audio in the car i was testing my fm transmission to.

When i removed the aux plug i no longer had audio, and not enough output to my fm transmitter to work.. Im going to try to fix it, however im worried it was the fm transmitter that caused something to burn out or fail.

Im also concerned if i buy a new unit, and modify the aux input also it will cause this on the new unit. I opened it up and it was just soldered to the pos/neg speaker leads and done by a skilled person so installation was ok.

anyone here have this current type of set up.

Edited by pbotz2000

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I would replace the cable you are using. It could have been bent too much and is now shorting internally. If that does not work,s ounds like a short somewhere on the aux out plug.. I would consider redoing the soldering and the jack itself.

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i eneded up buying a new box. the internal circuit board amp is hard to find locally so ill just fix and sell it after christmas

im concerned about using this new one in the same manner. pretty sure ive heard or read stuff of other people doing this mod to the mr christmas boxes. The cable was also new that i used.

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I ended up snipping the speaker wire and adding red/white male and female connections to each, which is also what my FM transmitter has. It has allowed me to switch from speaker to FM simply, but I can't have both at once.

The problem I am having (and I had this problem before I did the FM transmitter mod) is that as soon as the temp drops (think high 20's overnight), the box stops working correctly. Either it will play one song and stop (power's on, but no light or music output) or it will show the lights correctly, but the music will sound very choppy. If the temp stays in the 30's or higher....no problems. I even moved the box into an encosed porch (still no heat), and same problem.

I'm thinking of just buying a new one and hoping the problem was a fluke with this unit I have now. Does any other users have this problem? The other issue is that you can't just leave the switch on and operate on a timer.....has anyone found a way around this?

Sorry to sabatoge your thread.....it just isn't easy getting many LASOC user's eyes in the same place too often.

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Unfortunatly 2.5 weeks of using my new mr christmas box(with modified/added aux jack) the same issue occured and the sound went out. I did my diagnostic and figured it was the internal amplifer soldered onto the circuit board.

 

I bought 2 new amplifer chips and soldered one into each  unit, and now they are working with full sound and back to normal operation.

 

My opinion is the resistance value of the aux jack/and fm transmitter is very low compared to the 8 ohms the speaker has. The lower resistance caused extra load and burnt out the amp circuit.

 

hopefully if anyone in the future has this issue, this post helps.thanks

Edited by pbotz2000

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I ended up snipping the speaker wire and adding red/white male and female connections to each, which is also what my FM transmitter has. It has allowed me to switch from speaker to FM simply, but I can't have both at once.

The problem I am having (and I had this problem before I did the FM transmitter mod) is that as soon as the temp drops (think high 20's overnight), the box stops working correctly. Either it will play one song and stop (power's on, but no light or music output) or it will show the lights correctly, but the music will sound very choppy. If the temp stays in the 30's or higher....no problems. I even moved the box into an encosed porch (still no heat), and same problem.

I'm thinking of just buying a new one and hoping the problem was a fluke with this unit I have now. Does any other users have this problem? The other issue is that you can't just leave the switch on and operate on a timer.....has anyone found a way around this?

Sorry to sabatoge your thread.....it just isn't easy getting many LASOC user's eyes in the same place too often.

Happy New Year Chad..I was browsing the forums and saw your post. I'm running Two Mr Christmas units; 1 six channel standard unit and 1 four channel wireless controller. I leave both units ON and have them plugged into an automatic timer that turns them both on at once with no trouble.  They are both sitting outside in the wind/snow and function without failure... so far!    Wireless unit has been running since before US Thanksgiving and the 6 channel , a week and a half before christmas(this one runs my 12 ft jr mega-tree. I bought 2 more 6 channel systems from walmart on clearance for $64 ea. before christmas so I can expand my display for 2013.  I hope my luck holds out with them.  This year I will have (3) 6 channels or at least 2spares for parts.  Best of luck    Glenn ,Kingston Ontario Canada

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i measured the resistance value last nite of the aux jack thru the fm transmitter with the transmitter on. The resistance value was  high at 20,ooo ohms.  My original theory of the resisance being too low was way off.

 

That being said, does anyone have any theorys as to  how the high resistance caused the failure of the internal amp circuit.

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