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Smart People please check my calculation

Old 02-07-2019, 03:10 PM
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Default Smart People please check my calculation

I am working on replacing my LCD screen on a Furuno RDP-149. The factory LCD screen is adhesive fixed to the front glass with what appears to be a very thick LOCA (Liquid Optically Clear Adhesive) commonly used on cell phones and such. This increases the screens brightness and clarity and also protects the LCD from moisture incursion, etc. The unit I am working on had a going bad screen, dead pixels galore in the corner and moving south and west as time went by.
I have acquired a new LCD screen and have identified a provider for the glass with the anti-reflection coating. So those 2 areas are solved. My next big hurdle is bonding the glass to the LCD with a LOCA type liquid.
I have measured the volume based on using a 1mm edge tape to affix the glass to the LCD frame.
My calculations are as follows.
Length of LCD (246.0625mm)
Width of LCD (192.0875mm)
Depth of LCD with edge tape (4.7625mm)
Total volume (225102mm)
Total Volume for Liquid ml ( 225.102ml) that is the mm volume x 0.001 to reduce to ml volume.

So, based on those calculations I would need 225ml of LOCA to fill the entire void behind the screen glass.
Would someone whom can calculate numbers please check my equation.
Old 02-07-2019, 03:35 PM
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While I am in here and have the RDP 149 disassembled. Has anyone upgraded the backlight CCFL to LED driven backlight?
The CCFL tubes in mine are working but figured it might be better, less voltage draw, increased brightness, etc.
The RDP-149 uses (8) CCFL bulbs to make the screen bright enough to see in sunlight, that's a lot of high energy usage.
I am wondering if possibly (4) LED strips would produce the same or better lumens.
Most of the "Kits" available use a maximum of (4) LED strips. It would also require having an LED driver that would convert analog voltage (dimming) to PWM pulses in order to provide the capability to dim the display when needed.
Old 02-07-2019, 03:40 PM
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I don't understand where you get the depth (doesn't mean it's not correct). but I can confirm that your multiplication & unit conversion are correct.

sounds like the unit is junk so you have nothing to lose...and I have never done any bonding like this...but I think it will be very difficult to get a clean, bubble-free bond. just thinking out loud
Old 02-07-2019, 03:42 PM
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I measured the width of the LCD frame, divided by 1/2 and added 1mm for the edge banding tape.
Old 02-07-2019, 04:05 PM
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I suppose I should have said "Depth" of the LCD frame. It is approximately 9mm deep.
Old 02-07-2019, 06:55 PM
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I bet he would know

Marine Electronics Repair
Old 02-08-2019, 03:05 PM
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R U thinking 4 mm thick of adhesive? Doesnt seem reasonable. Also, search for heated plastic blades to remove cured loca. Non trivial
Old 02-08-2019, 03:20 PM
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I thought it was pretty thick also, until I actually disassembled a TFT screen from its glass cover. Yeah, its that thick. It also cures to a gel, not a rock hard substance.

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