Question about V7 Computers & Internet
I have a V7 S20PD monitor which I suspect is no longer of any use. The display will stay on for 1 second then go blank. If I turn it off and then back on it will display whatever the computer is sending it, but only for a second then blank again. Any suggestions please.
V7 S20PD monitor goes blank after 1 second?
This trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From Wisiny.com can find those parts
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Posted on Jan 12, 2015
This is usually caused by one of the inverter transformers that drive the backlights, or the backlight itself. The capacitors should not be ruled out, to fix it will be expensive venture.
Posted on May 17, 2012
Well my Acer AL1711 finally gave up in as much as the screen flashed briefly at switch-on then went blank, regardless of brilliance setting so I decided to take it apart and try to fix it. The good news is that IT WAS NOT THE LAMPS that I feared in my earlier post and was easier than I had ever dreamed! First allow a good period of time for the internal components to discharge before starting. Remove the plastic clip at the base hinge to expose 4 screws - remove all four to release the stand. Then remove the 4 black cross head screws that appear to hold the back on, they do but there is more to do. Carefully tease the silver surround away from the case, best to start in the centre of each side and finish at the corners. There are many plastic clips to release before the surround comes away. Now remove the four cross head screws holding the pushbutton switch circuit board. The whole assembly can now be removed from the case and reveal a metal cover held by 2 SHORT (remember that!) SHORT! threaded machine screws. These once removed will allow the case to be slid away from the holding tabs located down the edges of the cover and removed. Now unplug the connectors from the board that has the mains input connector attached to it. You will see a heatsink with 4 electrolytic caps above it. Silly ACER designers, have placed the capacitors so that they get all the heat from the heatsink! Yes folks, the capacitors are above the heatsink when the monitor is in its normal operating position! So all the convected heat dries them out, nice. So the fault is due to a silly design error! Replace all 4 capacitors, two of them are 1000uF at 16V and the other two are 470uF at 16V, all radial types. Try and get capacitors with the highest operating temperature, at least 105 degree types and remember these are polarised, make sure you connect the capacitor + wire to + on the circuit board. You should have no problems with re-assembly but don't put the wrong screw where the short ones went or you are liable to see it come out of the screen LOL! Most important - - Don't forget the screw holding the earth tag to chassis. Good Luck, you will be amazed how much brighter the screen is now!
Posted on Mar 16, 2007
SOURCE: problem in monitor
you need to either buy a new inverter board, or if you are competant with soldering onto boards, you need to replace the c5707 transisters at points q740, q739, q760 and q759 on the larger board. best place really for the replacement c5707s is ebay
Posted on Aug 27, 2007
Is this a BenQ 731?
If so check inverter transistors on power/inverter board.The transistors and inverter transformers are generally dry,Resolder them.
Posted on Feb 27, 2008
You have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of he monitor. If you are good at electronics repair/soldering you can usually fix he problem. Check out a few pictures on my web site www.ccl-la.com/badcaps.htm You can take the back cover off your monitor and look for the bad parts, replace any that look like the pictues and your monitor should work fine. The capacitors do need to be installed with the correct + and - connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $35 plus shipping. I hope this helps, if so please rate my solution.
Over 21 years of computer and printer support/repair
Posted on Jun 19, 2009
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