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Anyone familiar with the Sony MHC 7900 system?

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Posted on Feb 26, 2009

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No sound on my RCA model P5293756


If the picture is OK, sound should be there, if the sound system settings are correct. Check the settings first. If found OK, check the speakers. If they too found OK, check and replace damaged component/s at its audio output section circuit. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product by anyone else could result in serious injury or death. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock. Instead, contact the nearest service centre.

Jun 03, 2013 | Projection Televisions

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KDS R50XBbr1 tv green light comes on flashes 52 times then goes solid red and the standby keeps flashing red no picture comes on and fan is running


This is of course a strange fault to Sony. You might have made a mistake, in counting the number of blinks of standby light. If blinks do not stop, ie, continuous, the fault should be to its II2 bus line. To locate this, if it is, is a very difficult task in TV repair. It will be best to contact any service technician. If you wish to get any more assistance, be free to do it by comments here.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product by anyone else could result in serious injury or death. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock. Instead, contact the nearest service center.

May 29, 2013 | Projection Televisions

1 Answer

We have a Sony KP-51WS510. In order to change the STK-392-560, does this have to be soldered?


The old one must be de-soldered and the new one soldered in.
Observe static precautions otherwise serious damage to components may happen.

If you are not familiar with desoldering small components without damaging the printed circuit board, employ someone who is otherwise you could destroy the circuit boards.

Dec 21, 2010 | Sony KP-51WS510 51" Rear Projection...

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My Sony KP-53XBR300 blinks on and off. It has gotten progressively worse. From once in a blue moon to constantly. The standby flashes five times and has done so since we got his television used.


TV requires Screen volt (G2) adjustment.
Let me know to help you if you are familiar with TV repair and have electronics knowledge OR ask local tv tech to fix it.

Mar 18, 2009 | Sony Projection Televisions

1 Answer

Sony kdf-55wf655


I hit the "display" on the remote for the Sony TV

Jan 23, 2008 | Sony Grand WEGA KDF-55WF655 36" Rear...

1 Answer

Sony kdf55-wf655


I hit the "display" on the remote for the Sony TV

Jan 23, 2008 | Sony Grand WEGA KDF-55WF655 36" Rear...

1 Answer

TV took a dump


Sounds like a problem with the Hyper Board.

Dec 13, 2007 | Toshiba 65H81 65" Rear Projection...

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Kv40xbr800 standby flashes 7 times, sony 40" Hello. I hope some 1 can help. I've a 41" rear project Sony TV ModelKP-41T65. One day it just decides not to turn on. When you turn on thepower you hear the...


7 blinks on a sony indicate that high voltage has exceeded 33K and the set is going into safety shut down. Check your Horizontal and rgulator circuits. Something in those circuits are causing the increased voltage.Hope this helps let me know if I can help you further.

Dec 02, 2007 | Sony KP-41T65 41" Rear Projection...

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Double images--3d view--ghost picture Sony KP-53HS30


The convergence amps are the big STK's*** located possibly on the G-board in the sony. It is very difficult if you are not familiar with components and soldering, You can buy them at MCMelectronics, bluestar-online.com, Tritronics, VanceBaldwin.com, etc. Diagrams are online at fixya.com on the rightside of screen. Places like Manual.com or you can search the web. Hope this helps!

Sep 24, 2007 | Sony KP-53HS30 53" Rear Projection...

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Yellow vertical bar on right edge of screen


Your set is starting to get a convergence problem and the only way to repair it is by changing the convergence IC's,(3)one for each color,the blue migh be showing more now but soon all 3 colors will be out of alignment and you will not be able to correct it with the custumer controls,is great that it has worked for so long without this problem,if you are familiar with tv service you have a place to check but if you are not too familiar be safe and call for help from a pro-servicer.Let Us know how it goes.

Oct 20, 2006 | Sony KP-53V45 53" Rear Projection...

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