Where is the DSP chip set on the Pioneer VSX-27TX?

You really should be an expert to do repairs on these recivers but if that is the case, you can get the maintenance manual here:
http://www.kallhovde.com/pioneer/tricomp/Audio/VSX/VSX-24_26_27_29_D908S_RRV2133.pdf

Hi!
you can locate the R9371 & R9374 beside or the same circuit of the IC 9374 Very near not far to IC 9374.

If your friend said the ROM chip was hit by lighting then most likely is is damaged.

This sounds like a problem with the DSP chip. Turn off any DSP and surround modes in the unit and see if it at least plays in stereo. You may need to unhook the DVD player from the 5.1 inputs and put the front left/right into a CD or TAPE input to fully test this theory.
If that doesn't work, I have a VSX-D309 that just came up for sale (sorry, no remote)

http://www.retrevo.com/support/Pioneer-VSX-D411-Receivers-manual/id/385ci976/t/2/

I believe it's trying to tell you something is wrong with its digital sound processing.

This was the best source I could find on it:
http://www.avforums.com/forums/av-amplifiers-receivers/381823-problem-pio-vsx811s-no-sound-display-says-dsp-ng.html


If you switch it to satereo / direct and the light goes out I'd say that would clinch it.

I have a Pioneer VSX-D411 and there is dsp ng flashing

There may be a subwoofer mute function on your amp. The sub out is nothing more than a preamp output with a low frequency response. It is meant to be amplified by an external amp. Either check your powered subwoofer for operation or look through your operators manual for a sub mute function.

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.

It definitely is the DSP board. I pulled mine out and it had already been repaired once and it repair work looks exactly like the ones shown here http://excelcier.com/pioneer_vsx-27tx/ .

Currently I can only listen to the radio in DIRECT mode, if i change it to Stereo or other DSP modes it will be silent no matter how long i wait.
How did your repairs go? Can you please let me know how you repaired it?

Thanks.

Hi I have a Pioneer VSX D908S which is basically the same amplifier as yours with the difference that the one I have has no THX certification, as a matter of fact the service manual is the same, and mine has the same problem. The prblem is located in the DSP board, if you are able to remove the bonett, you will see on the right side a metal cover, remove it, once you have removed it, look for a IC9374 it is located, -looking this board in front to you- almost at the left upper corner, this IC has the PDK042A on it, with a soldering iron resolder this circuit. This is common problem with this pioneer amplifiers, and this procedure not always works, the final solution is to buy the DSP board but it is expensive. Good luck! Miguel