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Sony kdl70w850b red light flashes 4 times

After turning on and for a minute tv stays on from 1 minute to 5 or more hours then shuts down and red light flashes 4 times just tried something i found on a sony blog another person with my same problem took settings off vivid video setting and it stopped doing it, its been 24 hours almost and mine is working ok for now, does anyone know what bought this would be

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  • Crissie williams Aug 04, 2019

    Is there a video how to get to that setting??

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2 Answers

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  • Sony Master
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The unfortunate part Mike Miller is a lot of people doing videos on youtube on how to repair sets really don't know what they are doing and sending people in the wrong direction with bad answers, they have something that fixed their set and think that is the only part that would cause the issue or causing parts to be ordered that aren't bad....here is what you do to diagnose your TV...I pulled my service manual for your set and this code is from a backlight dimming error, there are 2 things that would cause this, 1st is the LD board is bad and needs replacing...I have a link at the bottom for a new board from shopjimmy.com...2nd would be some bad LED lamps in the panel and its shutting down the PMW (pulse width modulation) signal and turning off the LD board (chances are this is what is happening as that board seldom fails)...if your able and feel comfortable doing it you can measure the voltage at the PMW pin on the power board...it should show between 3.5 and 5 volts depending on what setting the backlights are set at...If you see that voltage when you power the set up and its running but it goes to nothing when the set shuts off then its lamps.. Most likely you have a couple failed lamps in the panel as of now but more will burn out if you don't get it fixed and the run time will get shorter and shorter as more of them fail over time..if that voltage should stay when the screen goes back then its the LD board...Good luck...
Search results for kdl70w850b

Posted on Mar 04, 2018

  • 4 more comments 
  • vincent colan
    vincent colan Mar 04, 2018

    thank you Larry, very helpful i saw a video of a guy changing out light strips on a sony different model than mine , do you know if these are light strips and do you have a part # for my model, also what pin on the pmw would i measure the voltage at

  • Larry Mar 05, 2018

    Your welcome Vincent!...I don't have the manual out for your set but there will be a legend as to what pin is what on the power board. Almost all Sony TVs use the same voltage lamp but the connectors can vary along with length, you would need to take the part number off the strip as they can vary in the same model TV

  • vincent colan
    vincent colan Mar 05, 2018

    your the best thank you again, this is my son's tv he saved for awhile and bought it now 2yrs later hes not a happy trooper so im trying to help, so when i get a chance to get into this project and if its the light strip/bar who carries this part seems sony is hard to get certain parts or do you know any body in the long island ny area the fixes this

  • Larry Mar 05, 2018

    Try shopjimmy.com and search by part number on the strip, sometimes they can be found on ebay as well but you take a chance on getting a bad strip from there, Ive had it happen several times

  • vincent colan
    vincent colan Mar 05, 2018

    shopjimmy has none in stock at the moment when they do they said they will notify me at that time ill take it apart and see the part # before ordering , they said the same thing about getting the part # since parts vary on the same model # thank you

  • Larry Mar 05, 2018

    A lot of times Ive had to wait a couple weeks for parts from shopjimmy but I think its worth the wait verses go somewhere else.

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  • Contributor
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Sounds like blown capacitors look on youtube loads of videos how to fix problem just type in how to fix make model of your tv then stuck in stand by mode hope it hopes you out

Posted on Mar 04, 2018

Testimonial: "thanks for reply, but its not stuck in standby mode, i found nothing on capacitors repair for my model do you hacve a you tube link thanks"

  • 2 more comments 
  • Mark Miller Mar 04, 2018

    hi just type in how to fix tv stuck in stand by should find loads all the same just different boards

  • vincent colan
    vincent colan Mar 04, 2018

    that seems just for a reset i've done that many times

  • Mark Miller Mar 04, 2018

    How To Repair 40" Sony LCD TV With 4 Blinks - YouTube

  • Mark Miller Mar 04, 2018

    Sony Bravia TV kdl- red blinking led light error codes & solutions ...

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Posted on Jan 02, 2017

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SOURCE: my sony tv will not stay on

If you replace the lamp and need to reset the Lamp Timer Reset procedure is: With The Set In Standby Press Display, 5, Vol Up, Power on the remote control Press Jump 3. Or, To Display The Lamp Time Press 2 Nine Times. To Reset Press 3, Mute, Enter. One of these should work on your model. Make sure you replace the bulb first. There is a possibility that the ballast could be damaged by a defective bulb as well.

Posted on Jan 18, 2007

SOURCE: Sony KF-WE50

my front panel sound is not working.......?
how i can do this.?

Posted on Jan 05, 2008

  • 1 Answer

SOURCE: Sony FD Trinitron WEGA KV-36HS500 blinking red light 6 times

My Sony KV36HS500 Trinitron is doing the same thing. Last night the next street over was hit by lightning. The "7" blink pattern was happening, so like the manual stated, unplug it for 4 hours. Which I did. The t.v. is back up and running fine. It's a nice t.v., better than the plasma I paid over a grand for, that's already shot. It's a good t.v. and good that Sony put in the stand by protection to prevent the t.v. from dying an unnecessary young death. Patience, don't rush it, unplug the t.v. and leave it sit. Also, don't use a power strip, that was my mistake, and unplug your t.v. if storms are in the area, I was too lazy to and now I had to deal with this, in 8 years, only twice did this happen. I'd buy another one tomorrow if they still made them.

Posted on Jun 15, 2008

  • 8 Answers

SOURCE: Green flashes then tv turns off

OMG! My TV has been sitting in a closet for the last three years because I couldn't afford to have it fixed.  I have googled now and then trying to find a cure for its green affliction but never found the right advice until tonight. I can't thank J19666566666 enough!!  I just followed the instructions and presto!  Working TV again! And just in time for the Oscars (which is like the Super Bowl for me).  
The editor in me tweaked the instructions a little...
Its is real easy to fix. There are 2 screws holding the front speaker cover on near the bottom corners (there are plastic plugs covering the screws that need to come out first). Unscrew and remove the speaker cover (pull it out from the bottom a little then sort of down and out to get it loose but be careful because there are wires attached). Next remove the 4 screws holding the particle board panel in place. There will be a cluster of 6 adjustment nobs with a drop of white paint on each one (2 rows of 3 - do not touch the top row). The green is controlled by the bottom middle screw, Using a screwdriver turn it counter clockwise (to the left) ever so slightly (1-3mm) and there you have your TV back. Use the bottom right screw to adjust the red and bottom left screw for blue. 
Thanks again so much!

Posted on Feb 23, 2009

  • 1 Answer

SOURCE: 55" TV keeps shutting off automatically

Green light flashes 5 and then red light flashes 6

Posted on Sep 28, 2009

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