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Author Topic: LCD Backglight Failure (replacement options)  (Read 292 times)

holografique

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LCD Backglight Failure (replacement options)
« on: September 23, 2018, 07:28:08 pm »
After many years of operational use, my Origin Desktop (originally purchased in 2009) has started to show it's age. The LCD backlight appears to be failing. It flashes for a few seconds when I power it on, but then goes dark.

The unit is still operational, boots properly, and is still displaying the GUI on-screen. Just no backlight. I searched the forums and it looks like the only solution to this is to contact support and ship it to France for repair.

Being proficient in repairing synths (I do my own repair and maintenance on my vintage analog synths), I'd prefer to just find out what the part # is for the backlight and replace it myself. I've also replaced a handful of LCD screens on some of my digital synths, including an SY-77, Waldorf XT, Roland Alpha Junos, and Oberheim Xpander. So I'm very comfortable working in both analog and digital devices.

Phillipe - is this a possibility? I'm aware doing this would void my warranty, but again, I'd rather not have to deal with support and shipping it to France for repair.

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #1 on: September 23, 2018, 08:00:11 pm »
So some interesting developments:

1. It seems my unit is experiencing the issue that others have reported here, where you have to unplug the power supply, plug it back in, and then power on for the display to light up. interesting that it's developed this after all these years. I guess I consider myself lucky with this unit already being 9-years old with no issues till now :)

2. I've noticed that now there seems to be some "fluctuations" in the screen display. Almost as if there is some type of power issue that is causing "noise" in the power supply that is causing the display to fluctuate. Visually it looks like refresh scans on the display oscillating at like 30-50Hz. This to me seems to be possibly more of an issue with the power supply itself or the internal regulator in the Origin itself?

Maybe I just need to replace the power supply?

DrJustice

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Re: LCD Backglight Failure (replacement options)
« Reply #2 on: September 25, 2018, 04:57:16 pm »
Could it be the inverter for the CCFL backlight? The published service documentation includes a file "10_TECHNOTE_01 Defective inverter module replacement process.doc.rar" with incomplete PDF notes (corrupted files?) on inverter replacement - perhaps Phillipe could make the complete PDFs available?

The display module has the following annotation in the schematics:
PRIMEVIEW TFT 5.0a
PA050XS1 @ $38/1K
REQUIRES INVERTER LXM1617-05-62

The module seems to be readily available as NOS, and there's even an LED backlight version out there. I might be interested in replacing mine with the latter, but it's not urgent as my display behaves fine. (How about a group buy if we can find & fit an LED backlight replacement?)

Here's some info on the module and its variants:
http://www.panelook.com/PA050XS1_E%20Ink_5.0_LCM_overview_6814.html

Re. the "fluctuations", have you tried adjusting the contrast trimpot, either for restoring contact or for getting it into a working range?
« Last Edit: September 25, 2018, 05:15:13 pm by DrJustice »

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #3 on: September 27, 2018, 04:14:07 am »
Fantastic info DrJustice. Thanks for replying. I was not aware that the service docs for the Origin were published for public use. I'm definitely interested in looking at a replacement, especially with the one that uses an LED backlight.

I guess the first step though is getting those incomplete PDF documents on the inverter replacement completed.

Phillip - is this something you can help with

Thanks!

DrJustice

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Re: LCD Backglight Failure (replacement options)
« Reply #4 on: September 27, 2018, 05:00:47 am »
Links to the docs can be found in Philippe's "Origin technical documents" -thread.

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #5 on: October 06, 2018, 10:05:22 pm »
Thanks Dr. Justice. I really think the problem is with the external power supply. It would only make sense why reseating the external power cable on the PSU before powering on the Origin fixes the bug. That to me sounds like a problem in the external PSU itself. The reason I say this is because sometimes my Origin won't even boot properly until I reseat the power cable on the external PSU. It acts like it doesn't get enough voltage from the PSU and just hangs.

I'm going to pursue getting a new PSU first, and then from there I'd still like to investigate replacing the CFL with an LED backlight as it would be much brighter and longer-lasting.

Stay tuned...

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #6 on: October 08, 2018, 05:40:58 am »
Well, now it won't boot at all. Only a few panel buttons light up and the screen doesn't come on at all (no backlight or graphics displayed.

I definitely think the power supply has gone bad. My guess is it's not supplying enough voltage to the Origin. Sent a ticket to support and just waiting to hear back from them.

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #7 on: October 18, 2018, 04:49:38 pm »
So quick update: tested voltage / A readings on the PSU and it checks out fine. So it definitely looks like it's a problem in the Origin, and looks to be the failing backlight issue. It booted once for me last night, but the backlight still flickering. And mid-way through use, it died and froze up. Now not booting again.

So I'm gonna go the route of trying to replace the CCFL inverter first and go from there.

holografique

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Re: LCD Backglight Failure (replacement options)
« Reply #8 on: October 18, 2018, 05:12:01 pm »
Some more info:

Right now it appears to be two parts involved with the entire LCD display:

1. The CCFL / backlight module: http://www.panelook.com/PA050XS1_E%20Ink_5.0_LCM_overview_6814.html

2. Inverter that powers the CCFL / Backlight: https://www.digikey.ca/product-detail/en/microsemi-corporation/LXM1617-05-62/LXM1617-05-62-ND/711261



 

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