Question about JVC DX-T9 System

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Jvc DX-T9 system unstable

I have a JVC dx-t9 home theatre system which continously switches from DVD, tape, radio and Aux mode. that is, it plays dvds for sometime switches to tape e.t.c. how do i solve this?

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SOURCE: System unresponsive when modes are switched

Arnt they seperate things? ive seen some systems that dont function if thery are not in that mode. If its in DVD mode nothing on the DVD works, if its in the radio mode maybe the power changes over to the tunner only? you cant play both at once maybe their idea. Will things work when its in the cd mode? Is the unit staying cool?

Posted on Apr 13, 2006

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SOURCE: tempremental playing dvds

In response to your jvc-a75r DVD player, sometimes the solution might be less complex than it may appear. Had the same problem with my Samsung s321,the machine refused to read DVD's but would play CD's no problem. Simply opened up the cover(usually)4-6 small screws, and found my dog's hair inside of the player covering the laser eye.Electrostatic ionization attracts dust,etc. into the player remarkably well sometimes. Carefully used a cotton swap to remove debri. PLayerworked fine afterwards ...Good luck!

Posted on Feb 27, 2007

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SOURCE: JVC TH-M505 No Sound

It is possible that a fuse has blown in the sub-woofer box. This unit has the entire amplifier built right into the sub-woofer. It also has a number of fuses in it. I have found that over the years fixing these units that if a fuse is blown you will also have more serious problems in the amp circuit. That is usually why the fuse will blow. They sometimes even have a problem in the main head unit with a digital transistor that is a surface mounted transistor that will cause this problem also. This transistor is part of the turn on circuit that signals the sub-woofer to turn on when the head unit is turned on. None of these problems are an easy fix I am sorry to say.

If you have at least a little experience with electronics and the right tools, like a multimeter and soldering equipment, I may be able to help you figure out the problem. But be aware that these are not easy to fix, and you may spend lots of time trying to figure it out just to find out that you will still need to take it in to a service center and in many cases when somebody tries to fix these type of units and have no experience with them they often cause more problems than they have started with.

For starters you can at least check the fuses, but please be sure to unplug the entire unit from the wall outlet before doing anything, there is a big risk of electrical shock.

The bottom of the sub-woofer has 6 screws in it (If I remember right) and those 6 screws must come out, they are rather big and you must use a number 2 phillips head screwdriver. Then after that you must take out all the screws from around the edges of the black metal panel where the speakers plug in to. When those are all out you can pull the amplifier unit right out of the sub-woofer box. Be careful when you pull it out, you will need to unplug a set of wires to get it all the way out, maybe two sets of wires, I am going off of just my memory right now, but if you need more help I will look up the service manual to help you more.

You will find at least one fuse right near the board where the A/C plug goes to and then you will find a few more fuses on the board that is on the right side while looking at the amp block from the same position you pull it out from and this board is plugged into the bottom board and is vertical but the short side is up and down, the long side is going towards the back of the amp and it is running along the metal chassis on that right side.

I hope this helps you, if you need more help just post your questions here.


Posted on Nov 26, 2008

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SOURCE: how do i unlock a jvc home stereo

On the unit, press the stop button and the cd eject button at the same time. The screen will say locked still. Release them and press them together again at the same time. The screen will now read unlocked. You can then eject the cd.

Posted on Dec 12, 2008

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SOURCE: home theater system jvc th-d60

This is from the TH-D50 User Manual:

The connected TV is not HDCP-compatible. (“HDCP ERR” appears on the display.)
Disconnect the HDMI cable and connect it again, or use a shorter cable.

Posted on Dec 31, 2008

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SOURCE: NO SOUND From JVC TH-S5 Home cinema system

I know this is an old topic however someone somewhere might benefit from this feedback. I purchased the JVC TH-S5 service manuals from and after metering all the supplies as 'OK', I then focused in on the 'common' lines associated with the two onboard power amps IC's (STK413-400) and found that they were missing a bias supply. This is derived from the onboard 40v Supply 'dropped' down by a 47 ohm resistor R2702 (rated 1/4 watt but advised to make this at least 1/2 watt). The resistor was found to be open circuit i.e. a very high ohmic value. Looking at the circuit diagram again, I would feel that this is going to be a common issue with this unit.


Posted on Sep 12, 2009

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System unresponsive when modes are switched

Sounds like there may be a glitch in the microprocesor. Make sure when you unplug it that you leave it along for a few days and is there any type of clock or standby batterys in it take them out as well. If that dosent correct the problem your gonna need a service manual to trace the switch pulse to see if the units Switch matrix lines are low or lost because of a faulty micro or a bad componet like a small caps they install on the matrix to keep noise off them. Hard one to call with out seeing unit and analizing unit Good Luck

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