| Re: Instrument Cluster grounds / service... |
Subject: Re: Instrument Cluster grounds / service... by Schrade on 2016/7/22 17:27:12 VERY Informative discussion under Jay Eichenberg's comment - ", INCLUDES SOME DIAGNOSTICS FOR LCD, WITH POLARIZED SUNGLASSES HOW TO 'SAVE' F/B CONVERSATION??? -------------------------------------------------- Jay Eichenberg Mine are fading in areas, is that a bad LCD? Chuck Buttermore IV George or Bryan would know better, but I bet there's greater hope for 'fading' segments, as opposed to 'gone' segments??? If Bryan can do a video of bench diagnostics, then a coder / programmer might be able to do it himself... Chuck Buttermore IV And I'd SURE like to see MY bad LCD in ANOTHER bad I/Cluster, to see what displayed (or someone ELSE's bad LCD in MY Cluster......................... Jay Eichenberg My stuff is there, just faded, happened with the windows down and sun beating directly on the IC. Chuck Buttermore IV do you want a link to the IC i found on Craigslist? He ships worldwide.... Chuck Buttermore IV Yeah - do that Jay , please, although I think I have a new LCD, IF necessary - waiting for Bryan's verdict... Bryan A Thompson If it's constantly faded in these areas, it's likely the polarizing film. If the weak area moves around, the digital data pins (1-4) are the issue. Chuck Buttermore IV Bryan Polar Film is middle piece? Bryan A Thompson It's the grey transparent stuff that covers the glass panel. It's appplied to both sides, and then the factory graphics are applied over the top to provide turn signal high beam. http://batee.com/.../dcrg/services/9096_lcd_restoration.html BATEE.COM - 84-96 Corvette Digital Cluster Parts and Services batee.com Chuck Buttermore IV And if so, wouldn't wax on that film act like Immersion Oil for microscope, for light conduction, killing diffraction? Chuck Buttermore IV Got it. Is it Phosphate Coating that excites by electrons PHOTONS ! ? For translucency??? Chuck Buttermore IV Can polar filter FADING be determined with Polarized Sunglasses??? Chuck Buttermore IV WTH is George ?????????????????? George Rudolf Mezzomo Nope. LCDs contain, as the name says, crystals suspended in oil, between two layers of glass. When current is applied to a matrix etched into the glass (which makes up the graphics), it causes the crystals to react by organizing themselves in a certain...See More Chuck Buttermore IV So the segments are NOT enclosed in some field, withIN the glass? It's totally a function of the Polarization? George Rudolf Mezzomo The segments are just a conductive patch of glass. If no current reaches them, no change in crystal orientation. If polarizing film is faded, it won't block light properly and affected area will never darken. However, failed polarized has a quite distinct aspect to it, and in the worst cases, a quite noticeable acrid smell Bryan A Thompson It is literal polarizing film. It blocks all light not moving in a single plane. When an electric field is applied to the liquid crystal material, it causes light passing through it to become polarized at a right angle to what it was coming in, or tw...See More Chuck Buttermore IV So if there's 2 polararizing filters, on perpendicular axis, and one is failing, can it be tested with a polarized sunglasses lens??????? Bryan A Thompson If it isn't faded dark brown, and if it isn't the filter the light enters first (the rear film), it can be seen with polarized glasses. We give away remnants of the film to use for testing. It can be used front side or back side with a little more work. Chuck Buttermore IV GOOD info (y) Chuck Buttermore IV Test with Polar Film would be done by rotating 90' ??? Chuck Buttermore IV George "... the way they transmit [OR BLOCK] light..." - or BLOCK - right? Bryan A Thompson Yes, the scraps aren't marked, so you really have to hold the film up to the panel and then rotate it through 180 degrees. If you see the data, it will likely be much weaker than it looks from the factory. This is normal, and it's because the old faded film is still in place. Chuck Buttermore IV Got it. George Rudolf Mezzomo Both, Chuck. They can either transmit or block As a curiosity, I went about finding a dead/cracked LCD here and separated half of it. Glare is to show the oily film with the crystals Chuck Buttermore IV Get testing on video there Bryan ; put it on the bill for service, if you can there........... Bryan A Thompson The plane of polarization on the 90-96 filters are perpendicular to one another. This has the result of passing light when in the "off" state, and blocking light when the segment is on. If you would rather have black background and orange numbers, use two "top" filters or two "bottom" filters. Chuck Buttermore IV That would be cool. But I think my LCD cannot be repaired ? Let me know, I think I've sourced another here... (Daniel) George Rudolf Mezzomo Also as curiosity, the other half of the cracked panel I just showed. Marked in yellow the control circuitry, and you can sorta see the segments (pixels here) etched into the glass George Rudolf Mezzomo's photo. Bryan A Thompson It's too busy in the shop right now, but there are bench test videos on our YouTube channel. https://www.youtube.com/channel/UCNQtlxisD8JtPZC4NlRWohA crazyuncleburton Corvette Electronics parts and Repair. Digital Dashes, Climate Controls, and more. youtube.com Chuck Buttermore IV Can I see anything here that's out of order, in sunlight? Chuck Buttermore IV's photo. Bryan A Thompson We just started our own FB page. https://www.facebook.com/batee.engineering/ batee.com Engineering Automobiles and Parts batee.com Engineering's photo. batee.com Engineering 2 Likes Chuck Buttermore IV Jay - get that? Test yours with some Ray-Bans or Oakleys? |
