Question about JVC TH-C4 System
2 months ago my DVD jammed (my fault) I went to service to repair this. I had a lot of problems with this place (service center). They said that the mechanical timing is broken. They fixed it. When I brought this home my audio (sound, sub woofer wont turned on) was broken. They fixed this again (they broke that!) now is 1,5 month later and while I was watching movie the screen of my TV went black and got the message that there is no disk. I tried all 5 of them with different DVD's and CD's and nothing - can't see the disk. It tells me - no disk!
I went back to the service place saying that something broke down but they said that this MUST to me something new and there will be charge!
I have this system for over 2 years now and never had any problems! I called JVC customer service long time ago with the compalin on this place...nothing
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Posted on Jan 02, 2017
SOURCE: JVC TH-M303
Well this is and isn't a fix. I don't know what the underlaying problem is that causes the Amp to shut down but I have come up with a way to stop it from doing so. What ever the problem is it is triggering a circut on the board called "Protect" which can be circumvented. You need to start by pulling out the amplifier unit from the subwoofer assembly. You will see that there are two circut boards at 90 degrees to each other that are connected by 3 sets of connectors. You need to remove the screws and wire that hold in the board attached to the bottom of the assembly. You can then pull it out disconnecting the connectors. The connector closest to the power trasformer is the one that we are concerned with. On the vertically oriented circut board you will find a small map of the connector identifying pin #5 as "Protect". Inside the portion of the connector attached to the bottom board that you pulled out, use a small set of needle nose pliers to break off pin #5. Then reassemble the amp and put the subwoofer back together. I used this solution and it has been working since. If you have reservations about breaking the pin out then try just bending it out of the way and partially reassembling the unit and powering it up. Once you see that it does indeed solve the problem you can break it out. Like I said, I don't know why it started to turn off spontaniously in the first place but this does fix the problem.
Posted on Sep 25, 2007
First, make sure it didn't get muted, or the remote's volume got turned way down. Next, it might be time to involve a technician who can check all the power supply voltages. Many of today's electronics have multiple voltage power supplys, 5 volts for logic, 12 volts for motors, and amplifiers usually have the biggest- maybe plus and minus 30 volts for a total of 60. There are hazardous voltages in there too, a switching power supply starts with over 300 volts. So don't lick it and see if your tongue tingles, that's only for 9 volt batteries.
Posted on Jan 29, 2008
your looking at a capacitor (big round thing) and transistor (little black thing)
the y-221 on the capacitor should be a voltage designation, how to identify the transistor, well, i cant see it good enuf to say.
Posted on Mar 07, 2009
check your internal wires inside subwoofer.b4 that try to connect to other instrument to make sure it not working.
Posted on May 12, 2009
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