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Post by splinters on Aug 27, 2011 8:48:57 GMT
As of August 2011, you can no longer buy the inverter or dimmer board for the fusion. If the backlight goes you would need the whole LCD assembly replacing. Again though, that is no longer available so you end up with a fusion you cant use.
All is not lost though.
Open up your Fusion and you will see the two boards under the lcd screen. The right one (the dimmer) has two connectors attached. Remove them but make note of the bottom (wider) one. This is the 12v power cable you will need for the fix.
If your boards are irrepairable you can take the female connector for the 12v off the board or just buy a new one or a few pence/cents from an electronics store.
Now, get a soldering iron, solder and some black and red wire.
Go to Maplins (uk) or other electronics store and buy a 12v LED strip. It is 5cm long but comes up to 5 metres in length. You will need two lengths, total 10cm.
Next part...replacing the light.
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Post by splinters on Aug 27, 2011 9:04:18 GMT
Now, carefully unscrew the LCD board and remove the wide black connector from the top.
Work now in a clean safe area. Push the two black plugs out from the board and you can remove the aluminium shield. The cathode is soldered each end and passes through the backlight so either solder it off or snap it to remove.
Now solder the wires onto the female connector and the led strip, plug into the 12v cable mentioned in the post above and power on your fusion. There should be a nice bright light now ready to be fitted into the backlight.
Next part is tricky. The backlight is simply a piece of plastic with some white plastic sheet wrapped around it. Slide it out from behind the LCD screen. At this point you need to detatch the white pvc sheet from the acrylic block to be able to slide the LED strip into the space where the cathode tube (bulb) had been. The strip is wider than the tube so some careful rejiggling of parts here is necessary but it is possible.
Be sure to cover with tape the exposed ends of the led strip as it is longer than the aluminium shield. Make sure all soldered joints etc are covered with heat shrink or electrical tape.
Reassemble all those parts, you may have to pierce some new holes in the pvc sheet for the plastic plugs to go back in. It s all tight but does work.
Now, close it up, test and enjoy your fusion again happy in the knowledge that you saved a few hundred dollars, the screen may be a little brighter, the leds should last 50,000 hours and no side effects of cold or vibration. Consider it an upgrade rather than a cheap fix.
I have not posted pics because a. Im too lazy and b. If all this sounds daunting, you probably shouldn't be doing it yourself. I am no electronics expert but i managed this in well under an hour. Couldnt be happier with the results.
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Post by Jesse on Aug 28, 2011 2:29:07 GMT
Awesome, Thanks for the info! This is the back of the LCD display with the stock CCFL back light This is the front of the LCD display with the stock CCFL back light
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Post by splinters on Aug 28, 2011 7:43:16 GMT
You are welcome. When my fusion arrived damaged i felt like i had bought a sports car with all the latest features but someone had welded a metal plate over the windscreen; all that power but no way to drive it.
Put a big smile on my face when this worked. The low cost and extra reliability was the icing on the cake.
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Post by Jesse on Sept 22, 2013 17:52:40 GMT
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Post by Jesse on Sept 22, 2013 18:12:51 GMT
Here is a replacement for Fusion LCD display with LED back light  Attachments:
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Post by Jesse on Dec 21, 2013 3:51:40 GMT
Splinters, after replacing the CCFL with the LED back light 1. Did you end up removing the Inverter PCB from your Fusion since it was no longer needed? Once the CCFL back light is removed and the LED back light is installed the Inverter PCB is no longer needed  2. Is the Dimmer PCB on your Fusion is still needed to adjust the display brightness? Once the CCFL back light is removed and the LED back light is installed the Dimmer PCB is no longer needed Jesse |
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Post by tek_uk on Jan 4, 2017 17:44:35 GMT
Hi all,
haven't been on here in a long time!
My backlight still works but flickers… by that I mean that often when I boot the fusion, th backlight doesn't work.
I grab both end cheeks of the keyboard and twist very slightly and the backlight works. I can then play and it work fine.
So I suspect a lousy connection somewhere on the boards> Any idea?
Thanks
Lars
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Post by Jesse on Jan 5, 2017 14:07:35 GMT
Alesis Fusion affectionately known as "The Beast"
if a light twist gets the display working, it might be a bad ground, but check all connectors on the dimmer & inverter PCB's.
Check power outputs on the PSU
Black is ground
Blue is (-)16 volts
Yellow is (+) 12 volts
Red is (+) 5 volts
Orange is (+) 3.3 volts
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Post by tek_uk on Jan 5, 2017 17:13:52 GMT
Thanks.
Apologies, I'm not very technical, what do you mean by "a bad ground"?
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Post by parametric on Jan 5, 2017 22:59:00 GMT
Hi Tek . . . "ground" is the American term for "Earth". Quite a number of the Fusion's components, pcbs etc will be earthed to it's chassis. The Chassis of course is earthed to the Mains earth through the 3-pin IEC connector and the Power lead. Various issues do occur if one of these becomes "intermittent" - which I think is the problem in your case. Depending where it is, the effects can be intermittent audio - or in your case, the display . . . Look around the pcbs associated with the display and see if there is a wire secured to the Case (usually by a nut and bolt). Such wires are normally terminated with a brass eyelet. Undo the nut and give the eyelet a clean and retighten it. It could be as simple as that . . . As always - DO unplug the Fusion if you are going inside it . . .  parametric |
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jiffy
Junior Member
Posts: 253
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Post by jiffy on Oct 8, 2019 14:06:38 GMT
My backlight has been flickering for a while, but when I switched on the other day, the backlight was no more.
I decided to try splinters fix with the LEDs with the result that I couldn't be more pleased!
I don't think splinters hangs around here anymore, but if he does, kudos to you for coming up with this.
Paul
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Post by Jesse on Oct 10, 2019 1:11:07 GMT
Alesis Fusion affectionately known as "The Beast"
Glad to hear you got it working again Paul.
Did you remove the Dimmer and Inverter PCB's?
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jiffy
Junior Member
Posts: 253
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Post by jiffy on Oct 10, 2019 10:13:24 GMT
No, I didn't bother because they weren't getting in the way, and then after reassembly, I discovered that the dimmer pot still works!
I did deviate from splinters instructions slightly :-
I did buy two strips of (30) LEDs, but then I thought, why put two strips of 3 LEDs in the Fusion when I could cut six LEDs off the end of the 30 LED strip, which is what I did! - Perhaps I misread splinters instructions, but it seemed like he was saying to cut two strips of 3 LEDs.
It sounded a bit fiddly trying to feed the LEDs through the space vacated by the light tube, so I turned the bracket into a right angle by using pliers to straighten out the rounded part (on the bracket), then the LEDs were a nice fit.
I hoped the glue on the back of the LED strip would be enough to hold them onto the now flat(ish) surface of the bracket, but it didn't because the surface that had been straightened with the pliers wasn't smooth enough, so I used small cable ties on each end of the LED strip to hold then on the bracket.
Also, I cut the plug off the 12v lead and soldered the leads directly to the LED strip.
It's nice to be able to (easily) see what I'm doing again on the Fusion, rather than trying to use a torch (flashlight) to read the display!
Thanks again to splinters, I am really pleased with the outcome.
Paul
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Post by Jesse on Oct 10, 2019 15:41:18 GMT
Alesis Fusion affectionately known as "The Beast" I believe the dimmer pot does not control the backlight, but the display itself Take Care ... Jesse |
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