The screen on my monitor flashes on and off. The power light stays green but the screen will come on for about 1 second and then go out for roughly 2 seconds. I can see my desktop perfectly when it is on. When I unplug the vga cable, the monitor displays check cable untill it sleeps. Any Ideas?
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Re: SDM-HS73P Screen Flashes
This is a problem I have seen with a few LG monitors.
Your Inverter circuit is fine (that powers the lights to your screen so you can see the image on the LCD panel) but the monitor does not like having a video signal attached to it.
Bad capacitors on the power board can upset the current going to the controller board. This board included the video input circuit and the power supply needs to be stable for this to operate.
The controller IC that translates the video signal into what the LCD panel controller can understand is failing. Normally this fault occurs in the horizontal and vertical input of the IC. The fact you can see the other message on screen is due to it going through it's own internal and seperate section of the IC. In this case the only repair option is to replace the internal video board. Sony will not supply the parts directly to the public, but if you are really nice, they "may" tell you where to get one externally to Sony.
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It appears you may have a bad backlight. If you can see the picture content with a strong light shining at an angle to the screen while it is dark, then it is definitely the backlight. Most sets shut down shortly after getting a failure signal from the backlight inverter although you do not mention that happening.
The backlight uses two or more Cold Cathode Fluorescent Lamp (CCFL) tubes, and they'll have the same flickering as a failing standard fluorescent tube. If the light has a pinkish cast to it, this is a common sign that one or both of the tubes is bad. You may see the flashing on the top or the bottom and the other half of the screen will be dark; this means one tube is dead and the other is dying.
You may have failed backlight inverter circuits, caps failure in the power supply, or bad lamps. Here is the service manual: http://www.eserviceinfo.com/downloadsm/22184/SONY_SDM-HS73.html
You will need to open it up and take some voltage measurement in the power supply first to make that you do have correct DC voltage feeding the inverter PCBA.
The problem can be in three places: Power supply (look for bad caps), inverter circuits (shorted MOSFET/Transistors, caps, inverter transformers), lamps (bad soldering works on the lamps end connection).
See example of failed monitors due to bad caps, transformers, lamps: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside, main thing you will need are good soldering and mechanical skills and tools, and some electronic knowledge.
First check brightness and contrast settings. If all good could either be your lcd back light has gone or the inverter. To check if its the black light shine a torch through the back of the screen to see if you can see a slight image on it, if you cant see anything the inverter board is faulty and to repair needs to be changed.
Is the green flashing on the tower or the monitor?
If it is flashing on the monitor, then it might be tht the monitor is not gettign signal from the tower.
To check, disconnect the monitor from the tower and check the monitor. If you get a msg on the screen like no input signal or check video cable, then 99% monitor is fine.
Check for the power supply light at the back of the tower.
Disconnect everything from the computer and then press and hold the power button on the comp for about 30 seconds.
Then connect the cables and check if it is working.
check the brightness and contrast from the menu on the monitor try increasing it ... the problem will get solved... if same problem persists contact ur near by experrt technician he may tell that the tube is gone he must recharge it....