Tip & How-To about Computers & Internet

How to Resolve a Video issue

A lot of people do encounter problems relating to video. These are issues wherein they get corrupted video output,vertical lines, horizontal lines or no video at all. To be able to resolve these types of issues, we need to identify if we have a hardware failure of a software failure. In this discussion, I lined up a step by step procedure which will help you first identify the point of failure and hopefully resolve the issue.

First step is to identify if it is a hardware failure or not. In able to do that, all you have to do is to boot to the Sysem Configuration (BIOS) screen. Booting to the BIOS differs per manufacturer. What you can do is to observe your computer as it boots. Usually on first splach screen where you see the specifications of your computer, you will be able to see they special key needed to be pressed to get to the BIOS. Here are some keys that are you can try out to boot to the BIOS.



  • Del
  • F1
  • F2
  • F10
  • F9
  • ESC

What you need to do is to tap the key as the computer turns on.

If the issue is seen in the BIOS screen, that means that there is a hardware that needs replacement. It could either be the video card or the monitor (or LCD screen for a portable system). To futher isolate, you need a known working monitor. For a desktop, you just need to replace the monitor with a known good one. For a laptop, you need to connect the monitor to the laptop and transfer the video to the known working monitor (you will need to check your manufactrer's manual for this, but usually the Fn+F5 key works). If the issue is there in the new monitor, that means you need to buy a new video card. If there are no issues on the known working monitor, that means that you need to have your display replaced.




If the computer has passed the BIOS test, you need to see where the issue occurs. The next step is to boot to Safe Mode.
Safe mode is a troubleshooting state where only the basic applications and drivers are active. If you are having errors or boot failure, try to boot to Safe Mode.





Booting to Safe Mode:1. turn computer on and tap on F8 before Windows starts.2. You will be getting the Advanced Boot options. Use the arrow keys to get to the option for Safe Mode.

If you do encounter the failure in safemode, that means your video card is failing already or about to fail. What you will need to do is to reinstall the video driver of your computer and hopefully it works. If it does not, you will need to have it replaced.

Since we are already in Safe Mode, might as well uninstall the video driver of your computer so that we can install a working version.

Steps to uninstall the video driver.
  1. Press the Windows key + R. A run dialogue box will appear.
  2. Type devmgmt.msc on the run box then click on ok.
  3. The device manager would appear (for Vista and Win 7 you will normally get the UAC first. Just click ok on it). Look for an item named Display adapter. Click on the plus sign beside it.
  4. Right click on the item under display adapter and then choose the option that said uninstall.
  5. Restart the computer into the normal mode.



Once you are in the normal mode, you will notice that the screen resolution will be different, the icons are a lot larger than normal. This is because the what you have is just the basic video driver. You need to reinstall the advanced video driver of your computer. It is either you download it from the manufacturer's website or from the CD that come with your computer.

Here are some websites that might help in finding the appropriate driver for your computer.

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logic television model:lk-74spf no picture no sound vertical line across screen


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

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1 Answer

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Horizontal scan output problem. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

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Telefunken crt model Ttv280 Frame collapse how will i know if is the vertical ic or the jungle ic


Absence of Vertical scan output signal. You have to check its vertical scan output section circuit to detect and rectify this fault.
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
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hi there, is the single line horizontally or vertically? if horizontal line, you do have a vertical section problem, check some parts at vertical section, the vertical ic, the power source of vertical section ie diode & resistors. ty

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