Question about Sony KDL55NX720 3D LCD TV

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Why does it powers on for about 3 seconds and powers back off and red light blinks 4 times

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  • Sony Master
  • 74,383 Answers

Main board fault. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Posted on May 07, 2014

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6ya6ya
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Posted on Jan 02, 2017

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circuitcity
  • 137 Answers

SOURCE: power button

This is a very simply fix. Your problem is you have a bad thermal fuse. This fuse can be found in the Lamp housing. You need to take the back off in order to fix this problem. Replacing the thermal is not hard, but you need to be a little handy. Part number 1-910-023-93 Average cost $9.00

Posted on Dec 07, 2007

  • 86 Answers

SOURCE: Sony Bravia KDL 46", no picture, standby light blinks 4 times

Since the TV is still receiving power, the problem is going to be with the TV's mainboard.  After you unplugged the TV and plugged it back in, you said the power light went out again, so I assume the standby light wasn't flashing again?  The flashing standby light is indicating an error code so my suggestion is to contact Sony for service options regardless if there is a warranty or not because service is the only solution to this situation.  Don't forget to provide them the error code or 4 flashes repeating.

Posted on Mar 25, 2009

  • 89 Answers

SOURCE: red standby light blinks 4 times; no power

I will forward a link to a page where you can get more information about this issue.


http://www.kb.sony.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=C399467

Posted on Jun 18, 2009

  • 1 Answer

SOURCE: tv shuts off spontaneously. red power light blinks.

re: sony flat panel lcd tv mod. # klv s 40a10.
No power. When power button is pressed, nothing happens.
The stand-by at the power supply ( cn6201) measures to be 3.47 v. instead of 5 v. However, when I unplug cn6201 (5 pin connector) I can read 5v. at the power supply.
Any suggestions?

Posted on Aug 29, 2009

  • 8909 Answers

SOURCE: I have sony Bravia KLV

AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.

Posted on Mar 09, 2011

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Sony bravia kdl55hx729 3d led tv turns on 3 seconds shows picture than four red flashes


Hello,
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The blinking should be in a pattern.

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Replace the 2 bulbs. Unit powered up correctly and turned on like normal. Then Lamp1 and Lamp 2 indicator lights blinked (Indicating Start UP). After some period of time, it switched to Red 6 times blink...


1 red blink every 2.5 seconds indicates a cover error-- for this check the lamp cover
2 times red blinks very 2 seconds indicates temperature error. for this let the projector cool off check filters and fans that there is no blockage of air for proper cool down
3 red blinks every every 2 seconds Power error. incorrect voltage input or internal malfunction.
4 red blinks every 2 seconds indicates Fan Error check the fans make sure they are working and not blocked or need replacing.
i have nothing on 6 ligths go ahead reconect and check for proper count. hope this information helps.
Best of Luck.

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I have a 4 year old Sony KDF-E42A10 television - the power/standby light blinks red 5 times, pauses, blinks red 5 times again, etc. I have replaced the lamp previously when the light was blinking red 3...


Hi there,
5 blinks means there is a problem with the video board. It could be as simple as unplugging everything, includding power. Wait 3 minutes then plug power only back in. Or it may be a damaged component that requires replacing.
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1 Answer

Only comes on for a second power light blinks red 4 times, stops then repeats


4 times standby red light blinking is an error code that shows that Fan problem in tv. Check following possible causes of that problem in tv:
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2- Fan caught wires or harnesses.
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Maganavox flat screen tv no pic, red light blink codes...


Those blinks are fault codes. To know more visit the site linked here. http://electronicshelponline.blogspot.com/

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TV cant be switch on, RED LED diagnostic Blinks .. 3 times... then 4 times. Please advise probable cause and send sTV hcematic diagram.


Hi, this is main board failure and you will need to replace this vital board. you power board is fine but, it is unable to send a proper current through the main mother board due to the damage at hand.

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it all depends on the number of flashes , pause, repeat.
Since the problem did not indicate any beeps her is the following info


Power LED blinks RED 2 times, one every second, followed by a
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3 blinks 1 second apart = Processor not installed (not an indicator for a bad processor).

4 blinks 1 second apart .= Power Failure (power supply is overloaded)

Other possibilities are:
5 blinks 1 second apart No memory
6 blinks 1 second apart No graphics
7 blinks 1 second apart System board failure (detected prior to video)
8 blinks 1 second apart Invalid ROM

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