Saturday, June 11, 2016

Tech Troubleshooting Tips – Samsung plasma tv No video audio ok- UN55B6000VFXZA - UN32B6000VFXZA -LN52B750U1FXZA - LN46B610A5FXZA – Black circle on the screen – Vertical line – Vertical black lines – Led lcd and plasma television repair and service

Category: LED -LCD - Plasma Television repair and Service 

Contents of this article 

  • Plasma TV No video audio OK
  • LCD TV vertical lines 
  • Black circle on the screen 

Tech Troubleshooting Tips

Samsung Plasma tv No Video –audio OK
Often when you face the  No video, but audio is ok‖ symptom, you can easily find yourself guessing, or simply ―throwing parts‖ at the problem in order to solve it. This practice can be detrimental in many ways. Cost of repair skyrockets because of all the parts needlessly replaced, the chances of redo dramatically increase, and your first time fix rate decreases as well.
NORMAL INDICATOR LED OPERATION
First, let explain how indicator LEDs normally operate on a Plasma TV logic board.
Under normal operation (non-defective TV), the LED circled in red blinks rapidly (at least once per second). The LED in circled in blue remains unlit.
INDICATOR LED OPERATION IF THERE IS A MALFUNCTION
Here’s what happens if something goes wrong:
When there is a malfunction, the LED circled in red remains unlit. The LED circled in blue blinks approximately once every ten seconds.
Here are the steps you can follow to determine if the Y or X main boards are the source of the problem:
1. Remove the AC power cord.
2. Remove the flat ribbon cable running from the Logic board to the Y-main board.
3. Reinsert the AC power cord.
4. Test: Did the LEDs on the logic board return to normal blinking operation?
IF YES: There is a defect on the Y-main. Replace accordingly.
IF NO: Remove the AC power cord, and then go to the next step.
5. Reinsert the flat ribbon cable to the Y-main.
6. Remove the flat ribbon cable running from the Logic board to the X-main board.
7. Reinsert the AC power cord.
8. Test: Did the LEDs on the logic board return to normal blinking operation?
IF YES: There is a defect on the X-main. Replace accordingly.
IF NO: The problem does not lie on the Y or X-main boards.
Basically, the logic board LED can easily show you if the Y-main and/ or X-main boards are the cause of a  - no video, but audio is ok‖ issue. By simply removing the flat ribbon cables and cycling the power, you can pinpoint the exact board causing the issue and fix it right, without guessing, and most importantly, fix it the first time.
Tech Tips
Samsung UN55B6000VFXZA
Symptom: Distorted and violet or pink smear across top
Check the OSD menu. If the distortion affects the menu, change the panel.
Samsung UN32B6000VFXZA
Symptom: Circles on the screen.
Change the aspect ratio (P.Size),. If the circle remains in the same spot, change the panel. You can also check the internal test patterns. If it shows up, change the panel.
Samsung LN46B610A5FXZA
Symptom: When the unit is first powered on, the symptom can barely be seen. Over time, vertical lines appear, running through picture.
As you can see in this example, the OSD is affected. Replacing the T_CON and the LVDS cable will NOT cure the problem. The panel is the problem.
Samsung LN52B750U1FXZA
Symptom: There are two vertical black lines.
Check the OSD menu. If it affects the menu, change the panel.