Question about Sony CMT-HP7 CD Shelf System

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System cuts off 4 seconds after power on

Turn on the system and it cuts off in 4 seconds, red light blinks on the on/off switch. Have to unplug to reset on/off switch. when off, red light is steady on the on/off switch.

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Re: system cuts off 4 seconds after power on

Hi, be careful, check ur speaker connection , its getting short somewhere, remove all the speaker cables and then check if the problem is still there, sometimes the speaker voice coil also gets shorted inside let me know

Posted on Dec 30, 2007

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Check the back of the unit for speaker wire shorts, if everything looks fine suspect the output ic's in the stereo.

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My stereo just cut off while i was listing to it. and now it wont turn back on. and the power button is blinking red.

Try resetting the system to factory defaults
  • Disconnect the power cord
  • Reconnect the power cord
  • Press Stop (Square button), Play Mode/Tuning Mode, AND Disc 1 at the same time
  • Press I/O(power button) on the system

You will lose your clock and tuner presets.
You can find the full PDF manual here for reference:

I hope this helps,

Mar 11, 2011 | Sony MHC-GX450 CD Shelf System

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My sharp XLMP 130 all of a sudden started blinking red four times and then one long one - nothing works??

The problem is with the "power on" relay (RL841) located on the power supply board. Unplug the unit and take off the side panel and top cover. Remove the screws to remove the CD changer. There is a small black rectangular relay just below where the AC cord is soldered onto the PC board. Carefully remove (actually break it off carefully and gently & throw away) the plastic top housing of the relay. Plug in the unit and with a pencil or stick, manually actuate the coil armature while pressing the power on button on the front of the unit. I can almost assure you your unit will return to normal operation. Put it all back together and you're done. The blinking red 4 times followed by a long pulse indicates a power failure. The start up capacitor had drained and couldn't provide enough voltage to pull the relay coil in all the way.


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1 Answer

Blinking Red Light - Nothing Works

Call Sony, give them serial number (rear of unit) provide descripton of problem and failure to operate after powering off and they will issue a case number and give you an address in Lubock TX to send the unit. Send the unit, with the case number showing on the shipping label, include a proof of purchase, description of problem, return address. Also if you like me, have CD's in the changer make sure you note that during the telephone call with Sony and again on the description of problem. Very fast phone call.

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Un Plug It for like 10 to 20 seconds and plug it in it should work it happens to me all the time if it contionuls check the speaker wires and see if the wires are toching together that will be the problem to

Oct 27, 2007 | Sony MHC-GX450 CD Shelf System

1 Answer

Hello my name is mariah

here is what i found on amazon. i will let you know if i have sucess.

4 of 4 people found the following review helpful: stars-3-0._v47082372_.gif Easy fix for GX250, June 11, 2006 By J. Petrosky - See all my reviews
c7y_badge_rn_1._v47060296_.gif I recently repaired a GX250 that refused to turn on (flashing power led), and apparently this fix works for most other problems too, including "no disc" errors and no sound output.

What you need to do is clean and reseat the (widest) white ribbon connector that connects the front panel to the large circuit board on the side. To get to the connector, you'll have to take off the sides and the top, and then unscrew the cd tray so you can lift it up and get your arm and hand in far enough to reach the connector from the opposite side. Then unplug the ribbon cable, blow the connector out with some compressed air, and plug it back in firmly.

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Power Problem? My DS55 red standby light blinks at me and won't turn on.

I agree with your diagnosis. If one channel quit and the unit now ocassionally won't output at all then the amp is going into protect. Have it serviced.

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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

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