How to Troubleshoot Power Supply with no Standby voltage. Sony KD 70x690E led TV repair.

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  • Опубліковано 16 лип 2023
  • Here we have a 70 inch Sony Bravia 4K LED Smart TV model KD-70X690E with no picture, no power, and no standby light on the bottom of the television. TV is totally dead. The primary side voltages are fluctuating and no secondary side voltage rails are coming up, including the 5 volt standby voltage. I will show you a secret method to isolate if the problem is on the Primary or the Secondary side of the Power Supply. This is a complete troubleshooting method that you can use on any Switch Mode Power Supply board.
    The ART Facebook Group: / 850660809553928
    Switch-Mode Power Supply Course: bigdogtvrepaircourse.mykajabi...
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КОМЕНТАРІ • 59

  • @StaggerLeex
    @StaggerLeex Місяць тому

    You are born for a teacher.
    Thank you.

  • @danielisaac2203
    @danielisaac2203 4 місяці тому +2

    Far and few are able to convey knowledge . More importantly actually make the experience comprehensive
    Love your work. Cheers!

  • @makingthingsreal101
    @makingthingsreal101 11 місяців тому +9

    Neat trick to bypass the optocoupler and verify that the problem is somewhere in that feedback circuit.
    This is the kind of thing I most enjoy learning.

  • @louf7178
    @louf7178 9 місяців тому +4

    That's a deep understanding of the circuits with amazing casual manipulation. The only thing I could relate to is that the voltages should be stable; I think I've confidently ruled out my power board. Thank you.

  • @bindardondat5292
    @bindardondat5292 5 місяців тому +1

    Great to watch a professional work his magic. Wish I had this knowledge before spending $200 on parts for a Smart 58" tv that I couldn't get to come on. New main board, power board, & T-com board did nothing. Worst part is, Jimmy's tv won't take the parts back.

  • @Mechsounds
    @Mechsounds 11 місяців тому +2

    Hello from Melbourne. Your repair video came just at the right time. I was given a 60 inch Sony with exactly the same fault. Thanks to you the set has been saved from going to landfill. You have inspired me to use my electronic background more. Keep up the great work.

    • @bigdog8882
      @bigdog8882  11 місяців тому

      EXcellent! Make sure you check out the Course too.
      bigdogtvrepaircourse.mykajabi.com/

  • @winisrt6284
    @winisrt6284 8 місяців тому +2

    yes, your testing is very keen on the board and traced the power fault accurately thanks to your theory.

  • @nb4582
    @nb4582 3 місяці тому

    Great video, loved your debug process :) Helped me fix my parents TV too which is awesome, thanks!

  • @user-sr1tq5eb8p
    @user-sr1tq5eb8p 11 місяців тому +2

    Excellent repair video. Thanks 👍

  • @yaghiyahbrenner8902
    @yaghiyahbrenner8902 2 місяці тому +1

    please use flux when desoldering it helps with not destroying pcb traces and pads.

  • @alcobia09
    @alcobia09 6 місяців тому

    Excellent instruction... just found this video. Thank you for the post.

  • @saarike
    @saarike 11 місяців тому +1

    Great repair and tips!!! My humble thanks.

  • @wisher21uk
    @wisher21uk 11 місяців тому +1

    Brilliant fix mate nicely done 😊

  • @user-yx5bg7jz1t
    @user-yx5bg7jz1t 7 місяців тому +2

    Thanks! So why did the diodes go in the first place Bigdog?

    • @bigdog8882
      @bigdog8882  7 місяців тому +2

      Just component failure.

  • @toshisate8121
    @toshisate8121 11 місяців тому +1

    Great troubleshooting... Bear down

  • @FranciscoRios-gt2nb
    @FranciscoRios-gt2nb 4 місяці тому

    Thanks!

  • @hakikosaber1645
    @hakikosaber1645 7 місяців тому +1

    Good job .thanks .

  • @nab6026
    @nab6026 10 місяців тому +1

    i cant buy the SR5150 diodes in my area. Can you give me a few reccomendations fro other? Also can you tell me the minimum forward voltage, current and reverse voltage required for these diodes?

  • @MrA4awesome
    @MrA4awesome 8 місяців тому

    Hello, can the SR5150 be replaced with a different type of diode? I don't have those easily available to me locally.. Thanks

  • @DADEMANA
    @DADEMANA 11 місяців тому +1

    nice

  • @spenceredwards2664
    @spenceredwards2664 9 місяців тому

    I have a Samsung un55nu7100. No stand by light. Won’t come on or do anything. I’ve replaced power board and main board and still nothing. Led voltage are 3-5v when they should be 12.8. Is the back light bad?

  • @jeffcaidler572
    @jeffcaidler572 11 місяців тому +1

    Hi ,love your videos and your setup..
    I have a Sony Xbr65x850g ,i have 6 blink red light ,white screen , no sound ,Theoptical input shows power on mainboard ,Not sure where to start testing . Im stumped .

    • @bigdog8882
      @bigdog8882  11 місяців тому

      6 red blinks on Sony usually means you have bad led strip(s). But if you got a White screen, that means backlights are working. So Im stumped too lol. Check T-con board.

    • @jeffcaidler572
      @jeffcaidler572 11 місяців тому

      @@bigdog8882 Great thanks ,ok ill give it a try ,has for no sound would that be on tcon as well on somemodels attached to the display

    • @bigdog8882
      @bigdog8882  11 місяців тому

      @@jeffcaidler572 No , the mainboard produces the sound.

    • @jeffcaidler572
      @jeffcaidler572 11 місяців тому

      @@bigdog8882 Ok ,makes sense , i guess illtry the mainboard

    • @bigdog8882
      @bigdog8882  11 місяців тому

      @@jeffcaidler572 For sound problems always check the speakers first b4 you change Main board. Put meter is resistance mode and make sure the ohms match whats written on the speakers, and not reading open.

  • @kamalbuddhika6159
    @kamalbuddhika6159 5 місяців тому

    👏👏👏

  • @brianjames6890
    @brianjames6890 9 місяців тому

    Another great upload. Big Dog. 8882. Please can you send me any information on how I can join your tutoring. Many thanks in anticipation regards, Brian 👍👏🏴󠁧󠁢󠁷󠁬󠁳󠁿👍👏🏴󠁧󠁢󠁷󠁬󠁳󠁿

    • @bigdog8882
      @bigdog8882  8 місяців тому

      Any time Brian!
      bigdogtvrepaircourse.mykajabi.com/

  • @AK2I47
    @AK2I47 11 місяців тому +2

    How can you tell if a mosfet driver IC is dead? It is easy to determine that when the mosfet is driven by a singe tiny smd transistor but gets difficult when an IC is used.

    • @bigdog8882
      @bigdog8882  11 місяців тому +1

      There are a few things to check like, Vcc, output signals, gate drive, shorts on Vcc line, start-up, etc. All of that is covered in the course. Good question tho.

    • @AK2I47
      @AK2I47 11 місяців тому +1

      @@bigdog8882 I know output signals is a major factor but I forgot to mention that I do not own an oscilloscope. I was wondering if my meter would still read the frequency?

    • @bigdog8882
      @bigdog8882  11 місяців тому +1

      @@AK2I47 Maybe, but the only problem; depending on the meter is, it may not be accurate and you want to actually SEE the signal and duty cycle.

    • @AK2I47
      @AK2I47 11 місяців тому

      @@bigdog8882 Once I get KHz that should be good

  • @AbidHussain-qh2ms
    @AbidHussain-qh2ms 11 місяців тому

    JVC, LT-32A100 switching on tv after 15 to 20 mnts the brightness increases and the screen goes black, the indicator light and sound good, backlight stayed with very low power. When powering on from the remote, the picture comes on but then 15 mnts later goes away This happens again and again. Need your help, plz give some tips to guess which board may be faulty.

  • @frankhughes9580
    @frankhughes9580 7 місяців тому

    I hear you but the video part of your show is blacked out 🤔

    • @alcobia09
      @alcobia09 6 місяців тому

      I just saw and heard the video... it worked for me.

  • @SorenCarlsson-qr9gy
    @SorenCarlsson-qr9gy 11 місяців тому +2

    I fixed my backlight on my Sharp 70 inch tv and it has worked for a while but now the left side of the tv i black the right works fine what else can be wrong?

    • @bigdog8882
      @bigdog8882  11 місяців тому +1

      probably backlights. U have to check the return line on that side thats dark.

    • @SorenCarlsson-qr9gy
      @SorenCarlsson-qr9gy 11 місяців тому

      @@bigdog8882 ok every ledlightlamp is shining maybe it s the contector on the panel thats burned or the panel is broken

    • @SorenCarlsson-qr9gy
      @SorenCarlsson-qr9gy 11 місяців тому

      @@bigdog8882 can a panel be half broken? i cant see any crack in the left panel side .

    • @SorenCarlsson-qr9gy
      @SorenCarlsson-qr9gy 11 місяців тому

      @@bigdog8882 after a couple of hours tv running. tv left panel side show green vertikal lines so i guess some connection is bad

    • @SorenCarlsson-qr9gy
      @SorenCarlsson-qr9gy 11 місяців тому

      @@bigdog8882 i made a Hard reset and took the cables behind out and put them back again and the start cooling the tv with a fan so now it works fine

  • @edwardanthony7283
    @edwardanthony7283 11 місяців тому +1

    Depends on the price of a new board but I did not like Sony for televisions.

  • @vernonbosshard9317
    @vernonbosshard9317 11 місяців тому +2

    Why not ground pin 4?

    • @bigdog8882
      @bigdog8882  11 місяців тому +1

      I dont think that would work cause the opto would still be in the circuit. Then that would be like removing the 2 opto pins and shorting the 2 traces together instead of using a diode.

    • @bigdog8882
      @bigdog8882  11 місяців тому +1

      Good question.

    • @vernonbosshard9317
      @vernonbosshard9317 11 місяців тому +3

      @@bigdog8882 I assume when that opto transistor turns on Vce is near zero? On the other side they have a resistor across the LED, .5 volts seems reasonable. This is why I need schematics for TVS, I can't visualize it in my mind, like a deer in headlights. If you put it on paper I get it all day. I like bread boarding stuff like this, measure it and understand it, but with paper I'm lost. I'm getting fed up with Ebay buying parts, they advertise OEM quality parts but that's not what you get. Its full of fakes and knockoffs. We need radio shack again!!

    • @bigdog8882
      @bigdog8882  11 місяців тому +2

      @@vernonbosshard9317 I think radio shack was my favorite store. So sad they closed down. They were all over Chicago like liquor stores. lol.

  • @davidsonneidert5523
    @davidsonneidert5523 10 місяців тому

    *Promosm*