I dont exactly recall how strong the LED backlight i currently have is, as i may have been a little vague, although, i do know it used 800ma max at 12v or 24v with no difference in the output, but at 24v it just got real hot so, pretty sure that 12v, 800ma is the normal output.
Roughly 10W total.
Now, what ive been told from the manufacturer is that these strips will take up to 2A, though i have no idea if that is per strip, or total output.
I will soon be conducting an experiment at the risk of blowing out the LEDs, i have aquired a roll of thermal adhesive, frankly, hot melt glue is unnacceptable for holding in the LED strips anyway, i will re-open the monitor, re set the LEDs, adhering them to the aluminium frame of the monitor, bearing in mind the reflectors and guard are not in the monitor anymore (i might improvise something though to focus the light), then, i will be dumb and run the LEDs off that stepdown converter i bought, about 9V or so, the manufacturers rated voltage, ill raise the voltage until the total draw is either 1800mA, or the monitor becomes sufficiently bright to use normally at its default settings (currently the brightness/contrast are set to work at low light intensity), whichever comes first.
First i will do a short term test to see how strong the lights can go before the increase in power does not show a proportionate output of light, as LEDs do have a finite brightness i think, regardless of whether they burn out or not reaching it. Ill find out the upper end of what both can handle in parallel together, until one or both reaches, but not crosses, its limit, ill watch it for a while, see if it can dissipate the heat, and if all goes well, ill turn it down, put the monitor together, then crank it back up to see if the brightness i need, is less than its maximum, if not, ill leave it there and run the long term test, how long can the LED strips last at either enough, or what i believe is their designed maximum output.
Keep in mind, the room i have the wacom in is very well lit by natural light, i often have problems because of this, using the monitor during the day. So, what i say is enough will probably be enough for the 99% of other users who are happy with “normal” brightness, as opposed to cranking everything up all the time.
Based on what the manufacturer said, the strips can take 2A, either together, or each, which means theres a good chance i can safely double the brightness, and an unlikely possibility, quadruple it.
Ill make a new post and say how things go when i open the monitor up. Soon ill resume classes at university again so ill need my monitor in top shape before then.
If it works out, and they can handle the increased output, ill write instructions on how to make your own setup. using some cheap and easily sourced LED drivers for either strip, a suitable stepdown converter, and anything you might need to quickly do everything yourself without studying the entire contents of this blog.
Hi,
Can you give me the reference of the led kit you use ?
What is the length on the strip ? Is the led strip is dimmable by monitor’s menu ?
I wonder if i change CCFLs by another or if i use led strip…
Thanks 🙂
Yes, the led is, or should be dimmable from the monitors menu, but the plugs are not the same, there are 4 wires you need to identify, 24v, ground (negative), power signal and PWM brightness signal.
Power signal is just 3 or 5v or so that indicates to the driver the monitor is on. PWM signal is about 150-200hz that says what the screen brightness is.
just search “540mm led backlight” on ebay or aliexpress youll find it. theres only 1 kit type out there unfortunately.
If you have the skill, you could try to use CCFLs, but i dont know if its possible to put the monitor back together with the CCFL guard still in there, at least without cutting it down a bit.
youll need to repot the CCFL tubes and then also replace all the capacitors in the backlight driver since by design they will burn out either way and cause DC bias, whether they are the cause of failure or not.
Hello,
I’ve a wacom cintiq 24HD with the same problem than yours. CFFL are dead 🙁
If i remember correctly, the screen use 6 CFFLs. Do yo use only 2 led strip ?
Yes, the CCFLs are in 2 bundles of 3, so can be replaced by 2 LED strips, although you could probably fit 2 strips in each side, for a total of 4, if you use a thermal transfer adhesive and reposition one of the strips so its diagonally facing. There is a white screen behind the LCD so it will have some impact for sure.
Hang around, i decided to buy a second kit for experimentation rather than risking the lights in my monitor at the moment. Ive mentioned that the LED strips are not as bright as the CCFLs, but thats just if you use them as you get them. Im going to test them to see what their limits are when you add cooling (by sticking the strips to the aluminium case using double sided thermally conductive tape), since they have been running just fine for the past few months without any cooling at all, i glued them in but they arent really benefiting from any cooling.
Once i find out the limits of these LED strips, if they are as much higher as i suspect they are, ill write a guide on how to use them at a decent brightness that is about the same as you normally would do in this monitor.
Ill just mention this though in case you got the wrong idea. The LED strips definitely are bright enough to use for the monitor, im getting on fine, but its nicer if its brighter and i certainly think it could be which is why im looking still.
yes