Sony KDL-26U3000 dead, no standby power.

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Omegaman
    New Member
    • Jan 2012
    • 5
    #1

    Sony KDL-26U3000 dead, no standby power.

    Hi Guys,

    I've been trying to fix this for a few days. The set has power up to the rectifier D6000, standby by voltage goes from 0 to 1.8 every 10 seconds at pins 1 and 3 of CN6200. If I unplug the harness and measure the standy by voltage at the socket I get 3v gradually cycling to 1.5 every 10 seconds.
    Everything seems to check out on the power supply.
    Any ideas would be most welcome.

    The sets LED's don't flash and it won't power up in any way.

    Thanks !
    Tags: None
    • Omegaman
      New Member
      • Jan 2012
      • 5
      #2
      Re: Sony KDL-26U3000 dead, no standby power.

      I think I may have found the problem. I shorted diode D6206 in the stand by section. Fingers crossed that brings it back to life .

        Comment

        • Omegaman
          New Member
          • Jan 2012
          • 5
          #3
          Re: Sony KDL-26U3000 dead, no standby power.

          Just a follow up on this. Replacing the diode did indeed fix the problem. Original diode was a
          10ERB20.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Sony KDL-26U3000 dead, no standby power.

              Glad you fixed it! Was the diode on the secondary or primary of the power supply?
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Omegaman
                  New Member
                  • Jan 2012
                  • 5
                  #5
                  Re: Sony KDL-26U3000 dead, no standby power.

                  Hi, It was on the primary side of the stand by section, between T6200 and the power on photo coupler . There are 2 others of the same type D6207 and D6202 which I hear are also prone to failing. I replaced the bad one in mine with a BA159.

                    Comment

                    • bbjunkie
                      Badcaps Veteran
                      • Dec 2011
                      • 301
                      #6
                      Re: Sony KDL-26U3000 dead, no standby power.

                      Wouldn't it make more sense to replace D6207 and D6202 also then?

                      When a diode like this fails, I guess it could take something a lot more expensive with it.

                        Comment

                        • Xecuter
                          Member
                          • Jan 2012
                          • 34
                          #7
                          Re: Sony KDL-26U3000 dead, no standby power.

                          Were they regular diodes or zener diodes. My power supply also has no standby power and was wondering about them.

                            Comment

                            • hispeck
                              Badcaps Veteran
                              • Aug 2015
                              • 258
                              • nigeria
                              #8
                              Re: Sony KDL-26U3000 dead, no standby power.

                              hello friends i have same tv on my desk now, mine is that when i power sometime it will come on but sometime will not power on, when i leave it off for some days, it will power on, then after a while if i put it off and power again the green light will just flash and go off, i also noticed on the psu socket CN6200 i dont get stanby on any pin, i will have to plug in CN6400 and CN6401 on the main board before i can get 3.3v stanby, i dont know if that is correct

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • SkishyIshy
                                  Sony Bravia XBR-65x900f: No Power, No Standby-light - however 3.3v STBY is present
                                  by SkishyIshy
                                  Hey All,

                                  I have a Sony 65x900f that I purchased cheap because of a no-power issue.
                                  I assumed that because there is no standby light visible, it would be an easy fix - however upon opening up of the unit I can confirm that the 3v3 standby voltage is making it's way from the power supply to the main board. I'm a little confused as to why there is no standby light.

                                  I am firstly wondering if anyone has this model of TV, or has worked on one and can give me some insight. I have tried to find a service manual for this model, to no avail - and would really appreciate...
                                  03-17-2021, 11:44 AM
                                • noinimod
                                  Sony 55X900E no standby light, no power. Replaced mainboard already
                                  by noinimod
                                  No standby red light, nothing
                                  This Sony has a separate AC->DC power adapter supplying 19.5V to the TV power board (JK3)



                                  Disconnected JK3 power board from main board, checked voltages on all the pin outs

                                  At a few pins I can see the power supply providing 19.5V to the main board



                                  Based on the service manual triage.. it seems to be pointing towards the power board (JK3) being the most possible culprit


                                  LED light turns on when I disconnect LED driver board ribbon from mainboard (so i thought it is the mainboard,...
                                  12-22-2021, 12:58 AM
                                • GLISIT
                                  Asus Probook P5440UF-XB74 power issue
                                  by GLISIT
                                  Hi all,

                                  TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


                                  I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

                                  A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
                                  01-16-2025, 02:29 PM
                                • PopsCaps
                                  Sony Bravia KDL-40V2500 that will not power on
                                  by PopsCaps
                                  I have a Sony Bravia KDL-40V2500 that will not power on. The indicator flashes red 3 times.
                                  I do not hear any sound and I cannot see any backlight.
                                  I have tried disconnecting every cable on each board one at a time to see if anything changes.
                                  The only change is when I disconnect AC-DET cable on the Power Supply board or on the other end if I unplug the CN7009 connection on the B-Board and try to power on the TV the indicator will stay on solid green until I power off.
                                  My friend ordered another used power supply board but it is also doing the red indicator flash 3 times...
                                  03-25-2025, 11:23 AM
                                • macinjosh
                                  Sony KDL40EX501, won't power on, no standby light
                                  by macinjosh
                                  Hello all,

                                  My Sony Bravia recently (after a storm) shows no red standby light at all. Taking it apart, I noticed that one of the ICs on the main board seemed to have a hole in it, so I replaced the main board.

                                  However, I still have the same problem.

                                  I've looked at the SONY technical flowchart for these models, but am stuck at what to do at this point. Here's what I've done:

                                  1. I've verified that the power supply board is getting 120v AC.

                                  2. Verified standby voltage, about 3V DC on pin 1 of the power supply.

                                  3. Verified...
                                  08-10-2021, 11:44 AM
                                • Loading...
                                • No more items.
                                Working...