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Re: Left Channel not working
Not unless youve had solid state trouble shooting experience and experience soldering and unsoldering. If you havent, you should take the unit to a repair shop, as there are no user replaceable parts inside this unit. Your problem is probably the output IC or associated componet. Good Luck
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Check both your input(rca) and output connections on the inside of the amp for any looseness or damage, solder connections and so forth.. However I think your power/output transistor(s) are burnt in the left channel
your question depends on how good you are at electronic diagnosis (symptom diagnosis) and how adept you are at removing and installing electronc components. first you have to determine why the amplifier has stopped working on the left channel. Make sure that the problem isn't a simple one, take the speakers off the right side and hook them to the left side and see if you get sound. If you do,, then the problem is the left speaker or left speaker wire. If you don't get sound then tyr taking the input that feeds the right channel and pluggin it into the left channel and listen for sound, if you get sound now the problem was the signal from your source not being sent down the left side.
If it still doesn't work you need to move inside the amplfier, but first, get close to the back of the amp and give a sniff, do you smell anything (a pungent burnt wire or rubber smell) if you do, the the chances are good that some components have burned out. Do you recall having a shorted speaker wire on the left side? shorted speaker wires are notorious (especailly older equipment) for burning out the final amplifer stage. If this was an expensive amp it might be worth fixing, if its not worth much then maybe you should consider religating it to use as a monophonic amplifier (one channel) you could use it to power a sub woofer in a hibryd stereo or surround sound system.
I don't know what more I can tell you at this point. If you go through the steps I outlined, and want to tell me the result I shall be glad to respond and maybe give you another direction to head in. good luck and I'm glad you are adventruous enough to want to try.
If you have checked the speakers and wiring, the right channel has a audio driver or output problem, which explains the low volume, static, and distortion. A service technician will be required to fix the receiver so it will balance the left side.
The distortion might be caused by a resistor. The loss of volume could be the capacitors, but you could try injecting signals into the transistors to see if any has gone. They can cause the distortion and loss of signal. If you apply a soldering iron to any part it will heat up quicker, or you could also use a hairdryer for the whole thing. You can also get a freeze spray that cools things that have heat sensitive faults (available from electronic parts shops).
Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
5 1/4" Doors
Left Front (+)
Left Front (-)
Right Front (+)
Right Front (-)
6" x 9" Rear Deck
Left Rear (+)
Left Rear (-)
Right Rear (+)
Right Rear (-)
The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.
Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?
Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.
As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.
The radios claim 50W per channel, but in reality give 12-15W RMS power.
A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.
This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.
Try connecting it to the left or right output from the amp to make sure the speaker actually works. It might be the receiver that's the problem. Also, you must be in one of the surround sound modes on the receiver and not the "phantom" mode as it does not give output to the center channel.
The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.
If the Logitech Pulse 475 is the same as the Labtech Pulse 475 then the left channel amplifier probably blew. The Labtec uses a 5 pin TDA2030A, which costs around $3. You will need to know how to solder to repair this. The back of the case comes off by removing the 8 screws around the back of the case and lifting it out by the power cord. Then, simply desolder the left channel amplifier marked IC201 (it's on the leftmost side of the board, next to the volume potentiometer) and solder the new amplifier in it's place.