Question about Sony MHC-GX9900 Shelf System

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The System shuts off automatically

My Sony MHC-GX9900 system always shuts off automatically when I turn on the power and the power icon flashes red/green. I reset the system according to the manual by pressing the power button+stop+enter and it don't fix the problem, please let me know if there's anything I can do and if anyone else had a problem like this before!


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Re: The System shuts off automatically

System detects power rail irragularities.E.g +5ve the fault is in power supply section.

Posted on Dec 17, 2007

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I connected an aux to it i dont know how to like put it in aux mode i cant find it

The MHC-GX9900 has several audio input ports (RCA L/R) on the back of the unit. Press the TV or Video/MD buttons on the left side of the amplifier part of the unit. Alternatively, these are accessed in turn by repeatedly pressing the Function button on the remote. The TV input is the top one of the pair of inputs. The front ports are audio out to headphones and a pair of microphone in ports.

I hope this helps.

Cindy Wells

Nov 12, 2015 | Sony MHC-GX9900 Shelf System

1 Answer

How do I reset it?

Unplug it then replug it in... then power on the unit; then press the "stop", "enter" and the "power" buttons all at once and it will restart in factory default... should fix it

Jul 01, 2015 | Sony MHC-GX9900 Shelf System

1 Answer

Hooking a sony ghc-gx99 to bose speakers

If you already have speakes running, adding the Bose will probably get your system into trouble because they operate at a low impedience, around 4ohms.

Apr 30, 2012 | Sony MHC-GX9900 Shelf System

1 Answer

Sony stereo mhc-gx9900 audio doesnt come out of speaker thou all lights show its playing

There is a intermittent problem on the main board, or the headphone jack is dirty or worn contacts, buy electronic cleaner, spray into headphone jack or earphone jack, slide headphone jack in and out as you spray the contact cleaner, do this several times in a attempt to restore audio.

Apr 06, 2012 | Sony MHC-GX9900 Shelf System

1 Answer

Im having problems with my Sony MHC-GX9900, when i turn it on it it shuts down after a second or so, what can i do to fix it?

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Apr 01, 2011 | Sony MHC-GX9900 Shelf System

1 Answer

Where is the aux cable in a sony MHC-GX9900

Register and download the manual for free at

See Page 40.

"AUX" is just a generic label for any Line Level Input. On this unit that would be Video/MD (Audio In) or TV (Audio In).

Feb 27, 2011 | Sony MHC-GX9900 Shelf System

1 Answer

My mhc-gx9900 is on speakers b how do i get back on speakers a

Unplug it then replug it in... then power on the unit; then press the "stop", "enter" and the "power" buttons all at once and it will restart in factory default... should fix it ??

Feb 13, 2011 | Sony MHC-GX9900 Shelf System

1 Answer


power runs about 107 /wo shipping

Jul 01, 2008 | Sony MHC-GX9900 Shelf System

3 Answers

Sony MHC-GX9900 Shelf System

i have the same problem with the blinking light this problem is due alot to over heating be careful your fan is not burned up or is not being blocked it is a protect mode activation to prevent overheating

Jul 04, 2007 | Sony MHC-GX9900 Shelf System

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