LCD TV Power Supply 12V Testing

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Danga
    Member
    • Nov 2013
    • 10
    • Colombia
    #1

    LCD TV Power Supply 12V Testing

    ¿How can I load to test the 12V on an LCD TV PSU?
    The voltage is ok with a minimal load (a car break bulb) of 1.75A
    But I want to know how much current can I get to know the PSU is really ok.
    Tags: None
    • selldoor
      Slow Learner
      • Dec 2010
      • 7870
      #2
      Re: LCD TV Power Supply 12V Testing

      How many amps does it say its rated for - what is the problem will it not
      power the tv?
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • Danga
          Member
          • Nov 2013
          • 10
          • Colombia
          #3
          Re: LCD TV Power Supply 12V Testing

          I found that schematics of KDL-40EX500, KDL-40EX400 or KDL-32EX302 are similar to my KDL-40EX407

            Comment

            • munirutech
              Senior Member
              • Oct 2013
              • 72
              • Ghana
              #4
              Re: LCD TV Power Supply 12V Testing

              hi

              it depends on the siize of the tv and the design of the psu,i have one 32inch psu that says 3.5a on the 12v line pin

                Comment

                • Danga
                  Member
                  • Nov 2013
                  • 10
                  • Colombia
                  #5
                  Re: LCD TV Power Supply 12V Testing

                  Where did you see the 3.5A marking?
                  My TV is 40" and I can't see what is the maximum current.
                  I didn't find the datasheet of the regulators.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: LCD TV Power Supply 12V Testing

                      Post the good pictures of the power supply. Most power supply board will have label for the output voltage and current rating.
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment

                        • munirutech
                          Senior Member
                          • Oct 2013
                          • 72
                          • Ghana
                          #7
                          Re: LCD TV Power Supply 12V Testing

                          it suppose to be indicated on the psu or back of it but some manufacturers dont indicate it,
                          what is the actual problem you are dealing with?

                            Comment

                            • Danga
                              Member
                              • Nov 2013
                              • 10
                              • Colombia
                              #8
                              Re: LCD TV Power Supply 12V Testing

                              The board don't have that markings.
                              What I've been wanting to do is to prove that the 12V out of the PSU is fully working. That cause I have the proper voltages but the TV doesn't work.

                              If somebody can see, here is my complete history:
                              https://www.badcaps.net/forum/showthread.php?t=32891

                                Comment

                                • munirutech
                                  Senior Member
                                  • Oct 2013
                                  • 72
                                  • Ghana
                                  #9
                                  Re: LCD TV Power Supply 12V Testing

                                  i think what you are facing is the main board fault cause the BLON and TCON voltages are generated from the main board,try to send a close image of the main board too

                                    Comment

                                    Previous template Next

                                    Related Topics

                                    Collapse
                                    • Tynan Dill
                                      Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                      by Tynan Dill
                                      I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                      Upon bringing it home and plugging it up, it showed a standby light.

                                      I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                      The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                      With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                      Assuming...
                                      ORIGINAL POWER SUPPLY BOARD
                                      7 Photos
                                      11-22-2024, 01:46 PM
                                    • sam_sam_sam
                                      Modification to a ZD-987 desoldering/soldering station using a external switching power supply
                                      by sam_sam_sam
                                      I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

                                      I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
                                      07-01-2024, 06:34 AM
                                    • JimBanville
                                      Definitive technology SC 2000 subwoofer amp's power supply clicking and popping
                                      by JimBanville
                                      The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
                                      Opened it up and discovered the power supply is making a faint clicking or ticking sound.
                                      I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
                                      I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles...
                                      09-13-2023, 07:21 AM
                                    • Andreas_de
                                      Power supply Manson NTP-5561 (5661) LCD controller dead - PIC18F87K90 HEX dump required
                                      by Andreas_de
                                      Hello!

                                      i got a damaged Manson NTP-5561 (60V, 1,6A DC output) and and the main issue is that the controler IC for the LCD display has a short. The controler IC PIC18F87K90 is mounted on the back of the back of the LCD. Vss-Vdd = 3 Ohm. The 5V and 3,3V power line was killed as well, but that is not a problem. A new LDO 3,3V and 5V 7805 is already ordered.
                                      Replacing the PIC18F87K90 is necessary but that makes no sense without having the HEX dump of the new controler.

                                      Does anybody have such a power supply and could do a HEX dump of the Flash and EEPROM memory?
                                      ...
                                      2 Photos
                                      04-12-2025, 10:38 AM
                                    • shamsudeen
                                      Hi, Can we use SMPS Bench Power Supply for Laptop troubleshooting?
                                      by shamsudeen
                                      Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
                                      I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.

                                      i know that in linear power supply the noise will be very low comparing to SMPS supply....
                                      07-19-2025, 07:14 AM
                                    • Loading...
                                    • No more items.
                                    Working...