OOPS! How to invert screen image )get it back where it belongs)
My PC locked up while I was web surfing. I lost my temper and banged on the keyboard keys quiet hard, several times, mostly on the right side numeric keys.
The image on the monitor screen turned upside down and now I have to turn the monitor 180 degrees to read the screen. "System Restore" will not fix the problem. My Samsung manual does not cover that sort of stupidity.
I think I hit the wrong combination of keys and now don't know how to undo the BOO BOO.
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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
If you look at the screen at a sharp angle and you see a faint Windows image then the problem is a back light fault. This fault can be caused by a faulty inverter board that supplies high voltage to the CCFL lamp OR the CCFL lamp is faulty. The CCFL lamp is a very small diameter fluro lamp/tube and just before they fail completely they product a pinkish light. Replacement inverter and CCFL lamp are available from this WEB site. www.lcdparts.net
You have to check the back light of your lcd monitor. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.
You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
The setup menu on your monitor needs to be changed. On most monitors there are buttons which you press in sequence, go through these buttons and you will find a monitor mode which allows it to stay on permanently.
The fault sounds like a invert problem, the inverter supplies high voltage to the CCFL lamp which provides the backlight. If you see a dim image when you look at the LCD screen at a sharp angle then this confirms this diagnostics.
For parts, service and DIY info I have use LCD Parts - click on this link to their WEB site :- www.lcdparts.net
That's right, the problem is related to inverter, but source of it - backlight lamps (if you see an image for fractions of seconds) or MOSFETs (if you see an image for few or more seconds). Image shows up, that means inverter starts, but then goes off because inverter controller turns into protection caused by something. Checking lamps is not that hard. Disconnect all cables coming from the screen and remove chassis with PCBs, so you will keep the display itself only. Next, at the edge where high-voltage wires are coming from, there you will see tiny philips screws, take them off. Then gently and very straight pull lamps assembly off the display, one and then another. If lamp is bad you shall observe contrast black ring or black dots near to the electrodes. Bad lamps must be replaced, you can buy them on ebay, for instance, just search CCFL 19". Or, if you don't care about total brightness, you can substitute faulty lamp with 27 pF 3kV capacitor, soldered across appropriate HV-connector on the inverter board - this will work also.
When the LCD monitor display flickers and or has a black screen then the fault is usually a faulty inverter or the CCFL lamp. When you look at the screen at a sharp angle and you see a dim image then it is a backlight problem and it is caused by a faulty inverter or a CCFL lamp.
Check out LCD Parts for parts, service, and DIY info. Use this link to their WEB site :- www.lcdparts.net
I too have the same problem with the same monitor.. tv looks great OSD looks great.. pc is dim.. This has nothing to do with the inverter board or the backlight.. I believe that there is an issue with the components that render the Computer video.