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POWER ON BUT NO SOUND OR DISPLAY FOLLOWED INSTRUCTION FOR RESETTING MICROCOMPUTER BUT THAT DID NOT HELP

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I can't operate my kenwood KR-A4070 receiver manually anymore, it only operates with factory remote. When it was new, I could manually press the various function button's..such as power-tuner-etc., an


Only a service person can help now. Likely you have a connection loose, a buldged cap or maybe just a transistor with a cold solder joint. Not being able to see it makes it hard to tell.

Jan 21, 2015 | Kenwood Audio Players & Recorders

2 Answers

Model "KOT-152UW" The


well inside the unit check for any burn fuses on the power supply area, and into the control board. fuse basically the one will tripped if power surged occurred..

Jun 27, 2008 | Microwave Ovens

2 Answers

I have an AVR 235 Receiver. The front display does not light up nor is there sound. The power indicator and standby light comes on/off. I have followed manual instruction with the OSD button, etc., tried 3...


The failure of the front display indicates that there is a electronic fault.
So you need to check the power supply to the display panel, check the +5 to the processor and siplay drivers including the filament voltage to the display and the negative grid to the display. If not trace back to the power supply unit.
If these are present with no display check the linking cord to the display. Check the parameters of the processor which can confirm if the controller is working. if not you will need help for replacement of the processor and also since this is high densitty boad where service requires jigs and equipments.

Sep 15, 2011 | Harman Kardon AVR 235 Receiver

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Display Panel Problem.... my Onkyo TX-SR805 AV receiver works properly except No Display on the front panel. I follow the instruction troubleshooting on the manual by resetting the unit but to no...


Display Panel Problem....

my Onkyo TX-SR805 AV receiver works properly except No Display on the front panel.

I follow the instruction troubleshooting on the manual by resetting the unit but to no avail. It's beyond warranty period.

please help, thank you

Sep 27, 2010 | Audio Players & Recorders

1 Answer

Power button beeps three times. Lock button works. Nothing else works.Technician diagnosed microcomputer control board. Replaced board control 8183258. Still dead!- he never called back.......help


Try to unplug power cord for 10 minutes and plug in. If you have manual on hand, follow instruction to find error code on your machine. Please tell problems before it went dead. Thanks.

Aug 10, 2010 | Whirlpool GHW9200L Front Load Washer

1 Answer

I turned my micowave on it ran for about 5 seconds then stop and showed a display error of f7


Hello :


Microcomputer board failure . You need to change the microcomputer board.

good luck .

please rate !

Mar 30, 2010 | Microwave Ovens

1 Answer

Black screen display after switching on


Try restarting without the battery ...just the power adapter.

May 22, 2009 | Dell Inspiron 5150 Notebook

1 Answer

Reciever won't power up


HI, this amp may need to be reset. also, i would check the voltage selector on the back side to make sure the switch is set to 110-120v. once this is done, you will need to reset the microcomputer. here is the procedure.


The microcomputer may malfunction (unit cannot be operated,
or shows an erroneous display) if the power cord is unplugged
while the power is ON, or due to some other external factor. If
this happens, execute the following procedure to reset the
microcomputer and return the unit to its normal operating
condition.

Procedure- Unplug the power cord from the wall outlet, then
plug it back in while holding down the POWER key.

ok, after this reset, if your receiver isn't operational, it may have serious damage to its power board.

Mar 07, 2009 | Kenwood VR-605 Receiver

2 Answers

KRF-5030D i stand by mode


Does it go into standby when it's in another mode like : Cd or Video 1 or tape?

When you state that you checked the power amp IC's , how so did you do this?

Thanks n' let me know.

Feb 08, 2008 | Kenwood KRF-V5060D Receiver

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