I have just brought a new viewsonic lcd monitor to replace an older version of the same brand.... when i turn it on it says "no signal digital"... so i tried putting the old one back on and it also did the same thing can anyone help???
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Fault to the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size. Type in the brand name "Viewsonic" in the search box at the top right of the display window, to get gathered related posts.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Disassemble procedure to many popular brand TVs and other devices are given in detail with illustrations.
There is no degaussing to LCD monitors. The function is related with CRT type monitors and TVs.
The problem to your monitor should be either with its back light, or loose contact to the insertion sockets to LVDS cable. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
kdbooks, CCFL lamps could be weak (tired) or switch-mode-power-supply"/"ccfl inverter-supply" may need rebuild. Read my fixya profile for a while. Reading is free. Your ccfl back-lit lcd display is no different than any other brand in it's basic design and operation!!! Follow all links found on fixya. See how lcd displays are repaired to determine if you are capable of DIY repair to your Black or Blank n Black screen unit!!! Read the older (pg.15 and up) and you will understand all your options. Visit youtube. If unit out of warranty, then you will need to make decision on contracting out the needed work or if you will DIY repair!! Good luck on your quest. 12fixlouie
Either way, looks like a power supply problem to me, some Viewsonic screens are known to have a problem with their inner power supply card, If your screen is still under warranty I suggest you don't lose time analysing the problem and just make them come and fix/replace it