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Flashing Stand By Light In LCD TV Repaired

By on February 27, 2020
led tv repair

My cousin called me about this TV and said that when powering it up, he only gets a flashing stand by light and the TV does not power on. I went to his house early in the next morning after I dropped off my son to school.  He had the TV unhooked and ready to go which was nice.

led tv repair flashing

When I took it back to my shop, I confirmed what my cousin said about his TV, the stand by light was flashing and it was not powering on. I had the same kind of symptoms on my son’s play station TV and it was an easy fix. Check it out.

how to repair led tv flashing

Many times as technicians we always assume the worst in repair for example on this TV. When I first fixed my son’s TV by checking voltages and soldering joints, or maybe count how any blinks the stand by light makes then check it out on the net to find the fault, as I went through all that when fixing my son’s TV, everything checked out fine but the TV was not coming on. What could be the fault?

As I took off the back cover of the TV I headed directly to the power supply board and the main board and check for…yes, the screws on both boards and guess what? All screws were very loose and needed some attention.

how to repair led tv flashing fix

I used a regular Philip head screw driver and started to tie up all the loosen screws and at the end of the process (about one minute). Check it out.

how to fix and repair sony led tv flashing

The TV was up and running. I tested it for almost three hours in the shop and it passed the test.

As I called my cousin to come and pick up the TV, he was really shocked that I fixed his TV in less than half an hour. Because he is my cousin, I did not ask for money but he insisted to pay me something for my time spent on repair.

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous repair articles in the link below:



  1. Albert van Bemmelen

    February 28, 2020 at 1:27 am

    Did you also find out how or who made loosen those screws?

    • Waleed Rishmawi

      February 28, 2020 at 5:22 pm

      Albert: according to the customer, this TV was moved a I am guessing they were loosen in the process. have a blessed day

  2. Imoudu Onwumah

    February 28, 2020 at 5:47 am

    Well,to me,it's amazing for just loose screws to cause such symptom. It's an easy fix.l do enjoy your repairs work,gaining knowledge from your articles.Well done.

    • Waleed Rishmawi

      February 28, 2020 at 5:23 pm

      Imoudu: yes, loosen screws means no ground to the boards and without ground, the TV will not work. I am glad you find my articles useful. have a blessed day

  3. Parasuraman S

    February 28, 2020 at 4:56 pm

    Yes, my doubt is also same like Albert Van Bemmelen, who ever caused loose screws! How can it cause blinking LED problem? How will get it solved when you just fix the screws tightly? Looks like the problem might recur!

    • Waleed Rishmawi

      February 29, 2020 at 2:40 am

      Parasuraman: that tv was moved a lot causing the screws to get loose. It is a ground issue it is either by tightening the screws or solder a wire from the tuner ground and connect it to ground on power board. The same issue was in my son’s tv and so far it is up and running. Have a blessed day

      • Joven Urbano

        September 15, 2020 at 12:41 pm

        I agree with Waleed. I have repaired a laboratory analyzer which was fixed by cleaning a corroded screw termination. It turned out that ground connections were made to the chassis through the screws.

  4. Joseph

    February 29, 2020 at 12:28 am

    What I don't understand is when you tested all voltages and it was ok, yet the tv still blinking. During the troubleshooting, did you not found any voltage supply clinking or reading negative before you identify the problem to be PCB screws not properly tightened?

    • Waleed Rishmawi

      February 29, 2020 at 2:57 pm

      Joseph: yes I tested all voltages and everything was steady..but it was not coming on till I tighten the screws on both the power supply and the main board. it has to do with ground and of course when I test the power levels it should be ok because basically I am pushing on the board and it is pressed against the ground part but when I put the TV up on its stand, the ground is not there any more..that is my humble explanation to this simple TV repair issue. have a blessed day

  5. Yogesh Panchal

    March 2, 2020 at 6:15 pm

    Good Fix! Waleed

  6. Waleed Rishmawi

    March 5, 2020 at 4:38 pm

    Yogesh: thanks Man. have a blessed day

  7. diego lopez

    March 7, 2020 at 10:52 am

    que buen trabajo colega

    what a good job, colleague


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