I have a 29" TX-29S95Z set, which insists on setting the sound at maximum when you switch on, or when you change channels.(with about 20% THD!)
The remote works(all buttons tested on a remote tester), and the OSD show fine. The picture is perfect - it is a sound only issue...
You cannot enter the install menu, and you cannot tune any channels.
I suspect that either the uCPU or the sound uCPU has got itself confused. The fact that you cannot enter the normal install menu to tune channels also points to the uCPU, but I don't know how I can reset it.
Does anyone know how to reset the uCPU's in this model?
Is it possible that the EEPROM has become corrupted, and so, is providing false volume settings to the sound uCPU upon power-up?
This chassis uses the TDA9875A Sound CPU chip. It looks fine, does not appear to have suffered a static discharge from the tube, but I can't rule that out...
Unplug tv from the power source for about 2 minutes plug in. If this does not solve your problem U may have to futher check starting at the eprom for 5 Volts. also check for bad solders around the area
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Try plugging the TV into the AUX on the back of the receiver. If you get sound from the tv when you switch to AUX on the front of the receiver, then you know the tv is ok. You may also try connecting your CD player to the TV input on the back of the receiver, switch it to TV on the front of the receiver and if you have CD sound from the tv selector, then the receiver should be ok. Helps narrow down where the problem is. You may have to set the tv to enable its audio outputs in the TV's menu. It might not be putting out any sound until that setting is enabled.
quick things to check would be mic first cb/pa switch if you have a ext. speaker unplug it just to see if you can get any sound out of the unit, even a small hiss. Some times a mod kit improperly installed can take out the audio ic in the radio if this happens in a 29 you will get no tx audio or rx audio because the audio amp ic in these radios handle both tx and rx audio.
Did it ever work properly? If not, let's get down to basics and set it up for the simplest configuration it can have: FM source in stereo with front left and right speakers, no Surround Mode, no DSP, no Tape Monitor, no Mute, Volume not turned all the way down. Does that work?
Do you have Surround Speakers defined in System Setup A? If not, only Dolby Surround or Off are valid Surround Modes.
Is T2 Monitor indicator lit? Press the Tape-2 Monitor.
Is there acceptable sound other than during Speaker testing? NO? Is MUTE On?
Service Mode Function
MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can
be adjusted by remote control in Service Menu
How to enter SERVICE
In main menu, move to choose sound menu, set BASS to MAXIMUM, and set TREBLE to MINIMUM.
Simultaneously press " i " button on remote control and DOWN button (-/v) on the TV set.
Exit with off switch on tv.
When you next switch on TV it is as brand new giving you the option of setting pin number and user ID.
It sounds like the unit has locked up from a power flip type situation. I suggest powering the unit down completely overnight and then fire it up again in the morning and see how it behaves. Some of your system menu presets may have lost their settings and may need to be setup again also. Get back to me here if you have the same condition after doing a full reset in this manner.
First of all, be sure the volume is down fairly low so that you don't blow the speakers or the unit itself if and when the sound suddenly comes back.
I've repaired many units whose owners turned them way way up to try to hear something, then flipped off a tape monitor or mute switch and got blasted.
No sound with any input? (tuner, CD, etc.) Do you hear ANY noise or hiss from the speakers at all?
I hate to ask, but are the speakers and inputs connected properly?
On this model, the jacks are not set up beside each other as they usually are. Instead, the left channel speaker and input jacks are above the right channel jacks. This can be confusing!
Are the speakers actually selected? The proper speaker select switch (below the power switch) must be in the down position.
Is it possible that someone left a headphone adapter plug in the headphone jack? You know, the kind that allows you to use headphones with a 1/8" plug in that 1/4" jack? This will cause the speakers to be shut off.
If you don't have the owner's manual, it's at http://www.intl.onkyo.com/downloads/manuals/pdf/tx-sr500_manual_e.pdf
If none of this helps, the unit may have a problem and I would invite you to write back with more details on what you've tried, etc.