I have purchased 2 Ibanez TS8DX Tube screamers. Both are broken right out of the box. I plugged a cable into the out jack and into my amp. I then pluggen my guitar cable into the IN jack. Pushed the pedal, no light, no sound nothing. Oddly enough when I reversed the cables (opposite of Instructions) The RED light did come on but still no sound. Any thoughts?

i believe you need a 1/4" unbalance plug for the amps input. Basically a guitar cord. If I am understanding the question. ? or if you want to know the actual "input jack",Maybe it is lacking or missing? than that would be a "1/4" unbalanced input jack". good luck, I hope this helps.

If the sound you when plugging in the headphones is coming from the main speaker, it is just the interupt contacts on the headphones are making or breaking contacts. This can be a good sign if there is volume to it.

Make sure the plugs you are using are the right length for jacks in the Ibanez as there are 5 lengths in use.. If this just developed, the length issue is not a concern. If the jacks are loose, snug them down, it may be a faulty ground relying on the chassis contact with the jack.. It may be a broken wire. It can also be a dirty switch contact or dirty level control, especially the standby switch. make sure they are clean with some contact cleaner. Make sure your level is turned up too,

If you have effects, or a preamp on the guitar, make sure they have fresh batteries or good power connections and are not on mute.

This appears to be a common problem with this amp. Putting a smaller fuse will only cause it to blow easier...not sure what Ibanez techs were thinking. Mine blows with 500mA fuse...usually because failing to let it warm up the 30 seconds with standby switch off. I have used .75A-250V fuse and it eliminates the problem. Note: it also defeats the purpose of the fuse and leaves the circuit unprotected....voids warranty/fire risk/ shock risk/world will end, etc. I don't recommend using higher rated fuses but it appears that portion of the circuit draws more than the 1/2 amp fuse can handle.

I personally use Seymour Duncan Humbucker pickups, and have never been disappointed. You might want to take your guitar up to a music shop and try it on different amps to see if your amp is your problem, or if it is your guitar's pickups or wiring. You could also try adjusting the height of the pickups until the sound you are looking for is achieved. I have also had guitar cables make a big difference in the sound. Make sure you have a good set of cables, and you may want to adjust the EQ settings of your amp to make up what the guitar lacks.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Are you running it off the internal 9V battery or have external power adapter?. Might be needing a battery change

LED's comes on EVEN with a mostly dead battery or power adapter. The electronics quit at much higher voltage than the LED indicator so a failing battery is usual cause of bad audio in these pedals..

Try another cable. If the cable is not the issue start inspecting the guitar's wiring. A bad solder joint or broken wire can cause problems. But I suspect the cable. An easy test if you don't have another instrument cable to try, use a multimeter and test both the tip and sleeve of the cable. You should have continuity on the tips of each end. And the sleeve should have continuity on both ends.

This is known as self-rectification and can occur if the thing is near a strong radio transmitter.

You should check ALL your audio cables have good grounds. A broken shield on a cable can let in the radio signal which if strong enough can rectify (detect) and recover audio from an AM broadcast station. Note that some aircraft radios are also AM, You can also receive SSB type signals, however you will not get intelligible sounds.

Theonly user serviceable thing for you to check is the batteries OR power supply. If that were low, that could cause the problem.

It's actually the opposite. 1/8" jacks are almost always positive tip. I think you are best off using a 9VDC supply. If the voltage is not staying constant at 9 volts it could certainly do damage. If the supply you used was a negative tip positive sleeve you may have burned out a component or two...and more voltage than recommended could have done some other bad things. If it does not work with a 9VDC supply with the correct polarity you can fix it yourself if you have electronic experience. You could also send it to me and I'll fix it at a reasonable rate.