Element ELCHW402 - Screen Does Not Turn On

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #21
    Re: Element ELCHW402 - Screen Does Not Turn On

    They are normal, but how about the 24V at the connector that goes to the inverter board?
    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

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales
        #22
        Re: Element ELCHW402 - Screen Does Not Turn On

        Originally posted by jjl4999
        I purchased two like kind replacement capacitors and recorded the following results:
        C812 measured 4.48 uF out of circuit.
        C811 measured 4.75 uF out of circuit.
        Both new capacitors measured 11 uF out of circuit.

        I installed the new capacitors at C811 and C812 and first plugged the 1K resistor connecting Standby and 5Vs. I was able to measure around 13V on N811 pin 12 and around 10 V on N811 pin 12, all referenced to negative of C810. Voltages were in the acceptable range listed in Dick's document. I then connected all of the boards to the main power board, pressed the TV Power button, and recorded the following results at the cold side connector when referenced to the chassis:
        STB: 2.16 V
        5V_S (#1): 4.94 V
        5V_S (#2): 4.94 V
        12V (#1): 11.99 V
        12V (#2): 11.99 V
        BR1: 2.84 V
        5V_M (#1): 5.27 V
        5V_M (#2): 5.27 V
        SW: 3.02

        These values seemed normal so I picked up the TV and saw the blue screen with no signal message. I connected an antennae and have the TV powered on and working for the past few hours.

        Thanks to everyone for the knowledge and information. I enjoyed the whole process. My first successful electronics repair.

        I have to admit that I would not have guessed changing out C811 and C812 would have solved the issue. Any tips on how to become better at troubleshooting power boards and following schematics?

        Stay an active member of the forum and follow how other faults are tackled.
        Willing to help but I'm no expert.

          Comment

          • jjl4999
            Member
            • Mar 2017
            • 21
            • USA
            #23
            Re: Element ELCHW402 - Screen Does Not Turn On

            Originally posted by budm
            They are normal, but how about the 24V at the connector that goes to the inverter board?
            I measured 24.7 volts out to the inverter board across all terminals labeled 24V on the connector.

              Comment

              • jjl4999
                Member
                • Mar 2017
                • 21
                • USA
                #24
                Re: Element ELCHW402 - Screen Does Not Turn On

                Originally posted by dick_barton
                Stay an active member of the forum and follow how other faults are tackled.
                Will do Dick.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA
                    #25
                    Re: Element ELCHW402 - Screen Does Not Turn On

                    Glad it is working.
                    Last edited by budm; 07-22-2017, 02:47 PM.
                    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

                      Previous 1 2 template Next

                      Related Topics

                      Collapse
                      • Ryan.man
                        Macbook 2017 with touchbar (A1706) won't turn on after removing the screen
                        by Ryan.man
                        Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!

                        My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.

                        This time the original cable broke too close to the screen, it can't be fixed without tearing the screen...
                        02-04-2025, 12:23 PM
                      • andrestecno
                        ASUS X201e - The screen does not turn on and remains black
                        by andrestecno
                        Hi everyone,

                        I'm dealing with an intermittent problem and can't find a solution. Sometimes my notebook starts up and everything works fine. However, after I turn it off and try to turn it on again, the motherboard starts, but the screen stays black. It seems like the notebook freezes and a green LED with a light bulb icon stays on.

                        If anyone has the service manual or any suggestions on how to fix this issue, I would greatly appreciate it.

                        Thanks in advance!
                        ​
                        07-18-2024, 07:14 PM
                      • smic717394
                        iphone XS turns off when press on screen.
                        by smic717394
                        Hi,

                        I have a iphone XS that came in for a screen replacement, the screen was badly cracked, and inside missing scues, on the back of the screen still the blue protector, the screen was a LCD. So we replaced the screen and all good, installed the screen and we noticed that pressing the screen with a bit of force but not excessive, the phone dies. After plugging the charger it turns back on, but again if you press it it dies. I open the phone again, and I can't see anything major, with the phone open, if I press on the logic board, battery, charging board, or even putting pressure on...
                        07-25-2024, 10:16 AM
                      • viniciussls
                        Notebook won’t turn on after screen replacement - Lenovo Legion Silm 5 16IRH8_LOQ 15IRH8 Compal ILG10 LA-M542P Rev 1.0
                        by viniciussls
                        Good morning everyone, this is my first post and I apologize in advance if there are any mistakes in the post.

                        I have a Lenovo Legion Slim 5 16IRH8_LOQ with the typical issue of stripes on the screen, but I made the mistake of replacing the screen without physically removing the battery, thinking that just pressing the SW2 button would be enough – it wasn't. The board showed consumption, with LED6301 lit up and PU301 getting very hot. I replaced PU301. Now, the board is not working correctly, but it has no consumption, LED6301 stays on, and I haven't found any other signs of a short...
                        04-02-2025, 01:40 AM
                      • ianbak
                        HP 14-bp151sa Screen Turn Off Issue
                        by ianbak
                        I have an HP 14-bp151sa running Windows 10 which has a very strange fault. It works absolutely perfectly until the screen sleep timer expires and Windows turns the screen off (it correctly follows the delay set in Windows for this). After that, neither the keyboard, trackpad or USB mouse will turn the screen back on, meaning that the computer is effectively hung. The caps lock button doesn't light when pressed, although I can still hear the fan running normally. A long press on the power switch to force a power down is the only way to get the system working again.

                        Things I have...
                        07-23-2023, 10:03 AM
                      • Loading...
                      • No more items.
                      Working...