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Post by lars on Oct 1, 2017 16:17:28 GMT
Hi all, I have posted in this site before about 2 problems I had with my fusion.. 1. Backlight no longer working... This one seems to have been failing slowly as it flickered for a while until it stopped working altogether 2. Fusion would restart randomly... which would seem to indicate a faulty power supply.... I have put these issues on the back burner for a while, even thinking i would put my fusion for sale as Spares.... Anyways, today I decided to investigate a bit more so opened it one more time, this time equipped with magnifier :-) Below is what I found: Backlight: Out of the 2 boards under the LCD, the left hand one (the one with 2 white connectors top left and right and a bit white component), the red component seems to have exploded i.e the bottom has burst open.... So I suspect a replacement would fix it? I can't see a component reference though so if anyone has one it would be much appreciated. Worth a try anyways. battery: I removed the battery and a component underneath seems to have leaked... It is a black component which is labelled LT 6PK. I have cleaned the black stuff that had spilled around it but i suspect a replacement of the component might be required... Any idea what that component is and whether it can be replaced? Thanks Lars Photos on Google Photos (not sure it works so let me know if you can't see them): photos.app.goo.gl/VpL7daY9ElKUzGg12
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Post by Jesse on Oct 3, 2017 19:17:02 GMT
Alesis Fusion affectionately known as "The Beast" The first picture is the power supply, right? Blurry pictures Looks like a burned out zener diode, the new PSU's do not have that on the bottom of the PSU PCB I would buy the new Version PSU, they run cooler. Available in the UK, but not in the USA New PSU Power Supply part SPSHA33R4-058-058N The other picture is the inverter PCB & dimmer PCB if you replace the CFL back light with an LED back light you can eliminate those two PCB's and use the 3.4 volt connector that went to the dimmer PCB and the Dimmer switch will control the brightness of LED back light. Great news, if you use the replacement LCD Display with 5 volt LED back light or if you replace the CFL Backlight with a LED Backlight you do not need the Dimmer PCB or the DC-AC Inverter PCB
Plus the small connector going to the Dimmer PCB provides 3.4 volts DC which is perfect for the 5 volt LED Back light.
This also eliminates two heat sources and reduces power drain on the PSU
Another plus is that by using the 3.4 volt connector that went to the dimmer PCB the Dimmer switch will work with the LED back light to control Brightness
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Post by lars on Oct 9, 2017 12:42:28 GMT
Thanks Jesse.
Yes the first picture is PSU. Didn't realise you could still buy the PSU. Is it directly from Alesis UK? I have reached out to them but have not heard back.
I was thinking it might be worth replacing the diode first and see if that works, but still, new PSU would be a nice option. Do you know how much they sell for?
Thanks
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Post by Jesse on Oct 9, 2017 15:09:48 GMT
Alesis Fusion affectionately known as "The Beast"
I believe Parametric recently purchased a couple from Alesis UK
Try the phone number in the header above, I would not waste time, order now while they are still available.
For InMusic parts in the UK call 0044 (0) 1252-896-000
New PSU part # SPSHA33R4-058N - PCB, Power Assembly for the Akai MPC 5000 & Alesis Fusion- $106 US as of 5-27-2014
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Post by parametric on Oct 9, 2017 16:33:52 GMT
Indeed Jesse - I bought two - Here in the UK (as I have 2 Fusions) The Guy I spoke to said they had "A Quantity" of them available, but wouldn't be drawn on "How Many" exactly . . SO - sooner is probable better than later . . . See my earlier comment about this mess HERE: fusioneer.proboards.com/post/18452parametric
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Post by lars on Nov 10, 2017 11:09:58 GMT
Ok, moving on at snail pace on this... but still need to fix it. Called InMusic and they have some power supplies in stock still. £83 delivered.... a bit annoying since it seems its only one burnt component on my PCB but unless i can find a suitable replacement component I might go that way... (worst case i could always put the extra PCB on eBay as spare) I am a little confused about screen though. It seems there are 2 possible routes: 1. replace with new LCD. Is this the one? www.mpja.com/LCD-Display-240-X-128-Graphic-with-Backlight/productinfo/31003+OP/#2. add an LED strip? Now, knowing i am not super technical (can dismantle and desolder/resolder but that's about it). Which is the easiest approach/less risky? The one with less power drain on power supply would be a plus :-) Thanks
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Post by Jesse on Nov 11, 2017 0:46:27 GMT
Ok, moving on at snail pace on this... but still need to fix it. Called InMusic and they have some power supplies in stock still. £83 delivered.... a bit annoying since it seems its only one burnt component on my PCB but unless i can find a suitable replacement component I might go that way... (worst case i could always put the extra PCB on eBay as spare) The new PSU's run cooler than the originals ... larger heat sinks and a mod to the PCB circuitry as well.I am a little confused about screen though. It seems there are 2 possible routes: 1. replace with new LCD. Is this the one? YESwww.mpja.com/LCD-Display-240-X-128-Graphic-with-Backlight/productinfo/31003+OP/#The new LCD with the LED would be the simplest way to go, but whichever way you go once you have an LED backlight you can ditch the Inverter & the Dimmer PCB's which will help the unit to run a little cooler
2. add an LED strip? Now, knowing i am not super technical (can dismantle and desolder/resolder but that's about it). Which is the easiest approach/less risky? The one with less power drain on power supply would be a plus :-) Should be about the same amount of power used with either LED backlight option.Thanks Alesis Fusion affectionately known as "The Beast"
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Post by lars on Nov 12, 2017 19:06:56 GMT
OK thanks Jesse. Looks like the LCD screen is out of stock so will keep an eye on one :-)
Laurent
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Post by lars on Nov 12, 2017 19:16:41 GMT
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Post by Jesse on Nov 13, 2017 17:10:22 GMT
Alesis Fusion affectionately known as "The Beast" Looks like the correct PCB, but there is no LED backlight on it and the 20 pin connector up vertical to the PCB instead of off the side on the same plane as the PCB I checked with MPJA and they will be getting them back in stock in about six weeks at the earliest, so around christmas time MFG: HANTRONIX P/N: HDM128GS24 Resolution: 240X128 Dot Size: .4 X .4mm Dot Pitch: .45mm Specifications/Features: 2.5” X 4.375” View area, Transflective type Dot Matrix display with white LED Backlight. Built in Toshiba T6963 controller. Requires 5VDC supply LED backlight requires series resistor to limit current to <= 900mA 20Pin right angle header for Data 8in leads for Backlight. L: 6" W: 4-1/2" O/A T: 1/2" WT:.5 Hantronix Wed site
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Post by lars on Nov 13, 2017 17:53:55 GMT
ha cool. Better wait than get the wrong one then! Thanks! :-)
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Post by lars on Nov 17, 2017 11:57:41 GMT
Right, until screens become available again i thought i'd give a try at repairing the backlight board... I have ordered the capacitor that was damaged, 150nf - 100V - 154J and replaced...no difference.. The transistor next to it seems to have suffered too when the original capacitor malteds will try to replace it too. For £2.5 for the capacitor, worth a try...
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Post by lars on Nov 17, 2017 19:21:39 GMT
While i wait for my new capacitor, i am investigating the LED option as it seems MPJA will not ship the screen to the uk :-( As it happens, I have some LED strips so did a little test: I have plugged them to the bottom plug of the dimmer board and they light up ok. I have removed the screen to see what it was like but that's where I am confused... Is the original backlight the metallic tube on the right of the screen attached with 2 round plugs and with white connectors top and bottom (see picture)? Is that what is supposed to be removed if I want to use the LED strip instead? Any pictures somewhere of then procedure? What happens to the white connectors then? photos.app.goo.gl/bYM1HQ57i0KItCxY2
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Post by Jesse on Nov 18, 2017 2:51:16 GMT
While i wait for my new capacitor, i am investigating the LED option as it seems MPJA will not ship the screen to the uk :-( As it happens, I have some LED strips so did a little test: I have plugged them to the bottom plug of the dimmer board and they light up ok. I have removed the screen to see what it was like but that's where I am confused... Is the original backlight the metallic tube on the right of the screen attached with 2 round plugs and with white connectors top and bottom (see picture)? Is that what is supposed to be removed if I want to use the LED strip instead? Any pictures somewhere of then procedure? What happens to the white connectors then? photos.app.goo.gl/bYM1HQ57i0KItCxY2Alesis Fusion affectionately known as "The Beast" Yes that is it, it's a CCFL light and it operates on 2,594 Volts (I believe that is 2,594 volts AC) coming from the Inverter PCB. The voltage output is displayed on the Inverter PCB where the CCFL light connects to it. If you replace the CCFL backlight with a LED backlight you do not need the Dimmer PCB or the Inverter PCB.
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Post by lars on Nov 20, 2017 10:38:14 GMT
Thanks, sounds like a bit of a leap of faith to remove it from the LCD... Will try replacing the capacitor first and keep that as last resort option then :-) Also came across this site: www.orientlcd.com/Graphic_LCD_s/1477.htmWould one of their screen be fit for the Fusion?
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