2x W2243S both different faults

[Mikeyboy2007]

hi there guys got a problem with 2 of the same monitors, first monitor powers on fine, produces a picture but has some striped bands running down the screen, second is a power fault, test the 2 5v pins leading to the control board and they appear to be fine at 4.95 volts, the problem seems to be with the control board, may be a power fault as theres some caps n stuf on there too and no red led but if i keep pressing the power on button the red LED flashes slighly, its like its loosing power somewhere, any ideas ?

[Rtech]

Re: 2x W2243S both different faults

I assume both units are open ??therefore the first thing I would do is swap control Boards (ie logic Boards) over and see if that clears one of the faults,and then if you get one working fine, then you can sort the Screen problem out, by swapping Boards, Screen as necessary.

[Mikeyboy2007]

Re: 2x W2243S both different faults

tried that already mate. the 2 power boards and control boards seem to be a little different with caps n stuff.. tried even swapping over the whole back part to the working screen and got backlights on and stuff but no picture.

[Rtech]

Re: 2x W2243S both different faults

The curse of Monitor Manufacturers !!! same Model number different inside ....BUT the Screens are inter changeable,so doing that may sort the Lines on Screen problem ??

[Mikeyboy2007]

Re: 2x W2243S both different faults

didnt work tried that too lol

[Rtech]

Re: 2x W2243S both different faults

I think you now have to take a different approach,and try iniitially to actually find out what is good out of the Monitors.
Firstly I would take both the Screens and test the Backlights,by using another good PSU of some description or a backlight tester etc etc and not connecting anything but the Backlights.
I would then Test the Power Supplies just with Mains on only.no logic etc,and check output voltages.If one of them is ok as per the voltages,then I would connect the tested Backlights you should have OR a good test set, apply an external 3v DC to the Backlight ON pins and see if the lamps work.
If you get to this stage then you are getting close to the real problem areas,as that only leaves the Logic Board and LVDS board and the internal cables.

[budm]

Re: 2x W2243S both different faults

Are the two LCD panels have the same brand and model number?
I think the one that power up OK but has lines on the screen more likely to have bad LCD panel. If the LCD panels of the two units are not the same, one may use different pinout and operating voltage (one may run on 12v, one may run on 5v, so you must be real careful when swapping the screens) for the T-CON board on the LCD panel assembly.
Even the same LCD panel model may have different revision and not compatible.

[Mikeyboy2007]

Re: 2x W2243S both different faults

Are the two LCD panels have the same brand and model number?
I think the one that power up OK but has lines on the screen more likely to have bad LCD panel. If the LCD panels of the two units are not the same, one may use different pinout and operating voltage (one may run on 12v, one may run on 5v, so you must be real careful when swapping the screens) for the T-CON board on the LCD panel assembly.
Even the same LCD panel model may have different revision and not compatible.

thanks guys will give these a try later and report back