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Bad channel It appears I have a bad left channel. Neither the left A or B output is working. Is this a hassle to fix for someone who has a moderate amount of experience with electronics/circuit boards? Anyone here know how to do it? Thanks

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  • provision Feb 07, 2008

    It's expensive enough to spend $100 to fix....I'll do that,..thanks

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What I know about electronics could fit in a thimble, but once upon a time, when receivers were a little simpler, I was known to blow the outputs in my old pioneer, go to the local electronics dealer, and have it back up and running that day. I haven't had that kind of luck with the more complex receivers. But since outputs are normally cheap I don't think it hurts to try. If it's an expensive receiver I would take to someone who knows what they're doing, but if its not what do you have to loose. When you order the outputs also order a solder sucker and some heat sink paste.

Posted on Feb 06, 2008

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How do you balance sound between two speakers. Where is the balance control? JVC RX5000v


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Check for a cold or broken solder connection inside the unit. The left and the right channels are almost identical circuitry. Compare the good channel to the bad one.

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Try swapping your cables from the sound-bar to the TV. If the sound still only plays through one channel but the channel has changed from right to left or vice-versa, then you have a bad cable.

If the performance is the same, connect a different device using the same cables to see if it's the sound bar input or the TV output.

Once you know where the problem is (the sound bar, the TV, or the cables) you'll know what unit needs repair or replacement.

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1 Answer

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PLEASE :) wear saftey goggles, no jewelry or watches while troubleshooting a live amp. Tube amps have up to 600V dc on some points so rubber gloves will improve the saftey margin. My primary suggestion is to take it to a pro. Please be safe if you are inexperienced. I can't be liable for my fixya suggestions.

I think you meant "changed" Left speaker with Right Speaker and visa versa. Some receivers have speaker A and B selections from a switch on the front, which is why I ask. I think you tried each speaker on the bad channel to find if the speaker was blown. If the speakers are OK make sure that the speaker wiring is good too. Sometimes they can be compromised so use two short lengths of new wire for trouble shooting. Try the other functions like tape, cd, phono, aux, dvd, ect. and if there is no problem with them then it is your tuning system. Check your antenna first. Make sure you are tuned to the station with max power received. Sometimes you can lose Stereo with analog tuners or be tuned to a harmonic frequency close to the target frequency. Check all of the fuses. Sometimes slo-blo fuses can blow incompletely resulting in a high resistance that causes a voltage drop. If the problem is still there you have trouble in the RF receiving/pre-amplification circuit or blown components in the output transformer/tube/transistor circuit. This is verified by having the same problem with the other functions above. In either case, you will need to take the unit to a repair service or get a service manual and test your voltage points to determine which components are bad. Without a service manual, I would start with the Left output transistor. Check the AC and DC voltages with respect to ground (chassis or negative output/input) on the good channel at all nodes and compare them to the same ones on the bad channel. Again, start with the output circuit for the amplifier. There will be one or more transistors per channel. They will be screwed to a heat sink. Also look for brown, cracked or melted components. Keep in mind that replacing these does not necessarily fix your problem as there is usually a failure elsewhere which caused them to go bad. Work your way back to the actual input signal and you will have hopefully found the problem. Good luck, be careful, and seek some local advice from your friends or repair technician. Happy Shooting!

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1 Answer

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Thanks,

dthomas

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1 Answer

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It is important to know just what attemps have been made to repair the receiver. What parts have been replaced, who fixed it (a service center or a freind or yourself)? If it has a bad channel and if just one bad part was missed and not replaced, you can burn up all the parts that have just been replaced.

When a receiver shuts off seconds after turing it on, this is known as the protect mode. Most of the time is has a shorted output channel causing this. Sometimes it can be caused by a transistor in the protect circuit shorting out when the channel that is shorted goes bad. Even after repairing the bad channel, it will still go into protect if the protect transistor is bad and has not been replaced. Many times a bad channel can still have some components in it that are bad after it appears to have been repaired. This is were experience working with these type of circuits comes in handy.

Let me know exactly what has been done with full details and I may be able to help you locate the current problem.

Dave

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5 Answers

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3 Answers

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