Question about Samsung LE40R74BDX 40 in. LCD Television

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LE40R88BD SCREEN FLICKERING

LE40R88BD LCD TV screen flickering, started out with power off/on and clicking

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: screen problem

call samsung...had the same problem with my HP-R5072...and they cant seem to fix it !!!! ... If your lucky you should get a replacement TV within 2 to 4 weeks ... :(

Posted on Jan 30, 2008

  • 1 Answer

SOURCE: Samsubg Monitor flickers

My samsung 740N lcd Monitor is flickering. can i get a solution of this problem?

Posted on Nov 05, 2008

  • 17 Answers

SOURCE: Gateway Flat Screen FPD1830

My Samsung 215TW started flickering like a strobe light when I would turn it on... then after a while, the speed of the flashing would change, and eventually, it would go out. After turning the unit on/off several times, I could get it to stay on, but after a while, it would start to get odd video noise (strange colors appearing on the screen), and then it finally quit.

Once the monitor went dead, I noticed that I could still see the image on the screen, albeit very dark, so I took my desk lamp, and placed it next to the screen, and I could see that the monitor was still active, meaning that there was an actual image on the screen, it was just that the fluorescent lamp that lights the screen was not staying lit.

I got tired of waiting for Samsung's customer service (thats a story all within itself), so I took the monitor apart in search for the problem (I am an electrical engineer and electronics specialist). I saw that there were two circuit boards, one being the power supply board, and the other being the video signal board. Knowing that there was still a video signal present, I focused on the power supply board, as it contains the transformers to ramp the voltage up to the necessary voltage to light the lamps.

I instantly noticed that several of the radial electrolytic capacitors on the board were bulging and looked like they had swollen and then blown. There are 5 caps on my monitor that needed to be replaced: (1x) 47uF/50V, (2x) 820uF/25V, (2x) 330uF/25V.

The 47uF and 820uF caps are on the power supply side of the lamp power circuit, and the 330uF caps feed the control signal into the IC chips that control the ballast of the lamps themselves, one for the upper lamp, the other for the lower lamp.

Once I replaced these units, my monitor started functioning correctly, and I dont have to give Samsung my absolute most favorite monitor ever for a refurb unit that most likely will have 15 dead pixels on it (mine has ZERO).

Posted on Dec 08, 2008

tray06606
  • 59 Answers

SOURCE: The tv will not turn on.

hi right now samsung is the best tv maker out right these problem dont happen with samsung what would be good to do is call them and let them know your problem cause you have a year protection on it thats if it less than a year

Posted on Jan 10, 2009

CAYPIANAN
  • 227 Answers

SOURCE: LN-T405H Samsung LCD TV

yes you are right it is the power supply, look for bad capacitors.

Posted on Jun 14, 2009

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I have a 40inch Samsung le40r88bd that keeps flickering and is getting worse is there an easy fix?


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1 Answer

What causes flickering on 2/3rds of the screen on my SONY BRAVIA KDL-32L5000 MODEL?


If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.

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Luxor 40 914 tvb


If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.

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1 Answer

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If you can hear sound, then screen is gone.

I'll bet you don't.

If you see an image, hear sound, just won't hold.
I'd bet on the T-Con board.

Not knowing what is really happening here..

If willing to dive into electronic's.
Open her up and start testing power side, starting with capacitors.

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1 Answer

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To replace the CCFL lamps, you have to disassemble the LCD module. It is a very skilled work, as CCFL lamms are very brittle. and should be handled carefully. It will be best to get this set repaired by any expereinced service technician.

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you need to remove main ckt, (m.board) some part need to re solder specially in hot area. (lost contact i one of the flickering problem you encountered.

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2 Answers

Flickering monitor


Flickering screen display

Flickering on the screen can be caused by defective hardware in the computer or by improperly installed software, but it can also be caused by interference from external devices. The following examples describe situations in which your screen could start flickering:
  • Screen starts flickering because of interference caused by devices which generate magnetic fields, for instance:
    • a TV set
    • a laser printer
    • another monitor
    • fluorescent lights
    • hidden power lines
  • Apart from interference, an incorrect setting in your system CMOS setup can also cause flickering. On some systems it is possible to distinguish between interlaced and non-interlaced monitors. The setup of your system should always be colour non-interlaced.
  • Proximity to the monitor of fans, air-conditioning units or other devices with rotating motors.
  • The number of devices using power from the same electrical line. Are you overloading the plug?
  • Monitor placed on an unstable surface.
  • Improper video drivers, this is a software problem, see section B
  • An improperly configured or a defective video card.

Sep 30, 2008 | E-Machines E17T 17" Flat Panel LCD Monitor

1 Answer

Monitor flickring


  1. Flickering screen display

    Flickering on the screen can be caused by defective hardware in the computer or by improperly installed software, but it can also be caused by interference from external devices. The following examples describe situations in which your screen could start flickering:
    • Screen starts flickering because of interference caused by devices which generate magnetic fields, for instance:
      • a TV set
      • a laser printer
      • another monitor
      • fluorescent lights
      • hidden power lines
    • Apart from interference, an incorrect setting in your system CMOS setup can also cause flickering. On some systems it is possible to distinguish between interlaced and non-interlaced monitors. The setup of your system should always be colour non-interlaced.
    • Proximity to the monitor of fans, air-conditioning units or other devices with rotating motors.
    • The number of devices using power from the same electrical line. Are you overloading the plug?
    • Monitor placed on an unstable surface.
    • Improper video drivers, this is a software problem, see section B
    • An improperly configured or a defective video card.


  2. Reinstalling the video drivers

    1. Start the computer.
    2. Click Start, select Settings, and click Control Panel.
    3. Double-click the System icon.
    4. Select the Device Manager tab in the System Properties window.
    5. Make sure that View devices by type is selected and locate Display adapters and Monitor in the list.
    6. Click the plus sign (+) in front of both items to get a list of installed devices.
    7. You need to remove every device by highlighting it and clicking the Remove button and OK when the warning message appears.
    8. After doing so for both items, they should disappear from the list.
    9. Close the Device Manager by clicking OK, and you will return to the Control Panel.
    10. Double-click the Add New Hardware icon.
    11. Click Next, select Yes when it asks "Do you want Windows to search for your new hardware?", and click Next twice to start searching for new hardware.
    12. This will take a few minutes and, after it is finished, you will have to restart the computer. Windows 95 or higher will automatically set up the correct monitor and video drivers.
    13. If the screen is still flickering, click Start, select Settings, and click Control Panel.
    14. Double-click the Display icon and select the Refresh tab.
    15. Change the Monitor Refresh Rates until the flickering disappears.
    16. If the flickering remains, go to step C.


  3. Troubleshooting

    1. If it is possible, connect a different monitor to the computer. If the flickering disappears, it is a fair indication that the monitor is defective, otherwise go to the next step.
    2. Set up the computer and the monitor on a different place in your house. If the flickering disappears now, it is most likely an interference caused by something in the original location. Check for devices which can cause interference.
    3. If the flickering persists, check the setup of your system. If available in the setup, make sure that the option Monitor Type is configured as Colour Non-Interlaced.

Dec 24, 2007 | E-Machines E17T 17" Flat Panel LCD Monitor

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