No sound from Pioneer VSX-37TX

“My pioneer VSX-531 volume turn download” download VSX-531 service manual and look for a volume control IC and check voltage supply if it is correct. If correct, check volume output,treble and bass waveforms to see if they are correct. If not, replace the IC. If not fixed, replace volume control.

If the output is fused, check for popped fuses. The output transistors could have failed, but most likely the preamps are not sending the signal to the output stages

power surge blew the channels or overload protection

try a different sub first, the fuse difference is not crucial but should try to use the one recomended by manufaturer

This must be caused by faulty audio. Ic

THE FIX - to audio problems that persist with the VSX-29TX and others using the AWX7272 DSP board is to replace the ROM on the DSP. My unit started failing on and off after 10 years of use! The intermittent DSP board is an Extremely Common and irritating Problem for this model! The replacement IC,(2) resistors + shipping and handling totaled $49.65 and my unit is finally fixed correctly! Don't believe other posts that you can get away with re-soldering; it will continue to fail again and again! Details of fix are:

Replacement for the old Pioneer ROM located at location IC 9374, should be done with the part PD6381A from Pioneer Electronics. You will also need to move (relocate) the 2 resistors (0 Ohm resistors) located at R9372 and R9371 to locations R9374 and R9373.

This component update applies to DSP boards marked as AWX7433, AWX7272.

This fix is validated (from Pioneer) on the VSX-26TX,VSX-27TX,& VSX-29TX it might also work in the VSX-908, VSX-908RDS and others as long as the same DSP board was used.

Let me caution and stress that surface mount soldering skills ARE REQUIRED to do this update! It also doesn't hurt to have excellent vision and/or an eye loop or microscope to check your work. Original ROM's were subject to timing changes internal to the part as a result of HEAT. This model does get HOT! The program was also modified as a further safeguard to re-occurrence.

blue two legged varacter on power supply board needs to be replaced

Suspect a DTS board capacitor failures the ESR characteristics.

To troubleshoot connected any available device to RCA stereo connections at input to multi channel in. Test input to the corresponding speaker output confirming audio quality. This circuit bi-passes the DTS function and connects to the power amplifier for the speaker.

Connect any audio amplifier from the preamp out and confirm the quality of the audio.

I suspect that the pre-amp out will contain the distortedf noise. If the distrotion appears in all the channels it is most likely the DTS.

These are repairable.

Hope this helps?

I'm having the same problem. I read on a kind of VSX-D510 eletronic manual tha says POWER OFF "When displayed, it's the case where DC is in the output of AMP".

Do you know what does it means? How can I solve the problem?

Have you tried the owners manual (not the repair manual)? It will probably have something about this. It may be that this is the generic message that the unit gives you when you have a bad output channel which would put it into a protection mode.