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DIY 5k Monitor - success :-)
- Thread starter fiatlux
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To follow up, I did check cable seating (both display and backlight) as well as checked and cleaned contacts. My analog brain is saying the image is compressing on the right so look for a horizontal width adjustment. But there is none I can find, either physical or on menu. Has anyone here run into this?
@Rip57 57
Does swapping the two DP cables over make any difference?
There looks like two possible problems:
The vertical stripe may be due to screen damage to the rear ribbon cable at the top of the screen where the fault is.
But your fault is different than a ribbon cable damaged by a sharp object when the screen was removed from the iMac.
Cutting into the ribbon cable just gives a black vertical line.
Does pressing on the screen at the top at the back where the line is make any visible difference?
The darkened right side of the screen may be a screen fault to the right side.
Or it might be a fault with the 40 pin eDP cable from the R9A18 to the right side of the screen.
Carefully check there is no damage to the eDP cable, or to the socket at each end.
Or it might be a fault in the R9A18. Faulty boards are unusual but not unknown...
If switching the cables over between the two R9A19 DP-in sockets makes a difference, then one DP cable is faulty.
Is there a Thunderbolt to Dual DP splitter?
Or are the two DP cables fed direct from the MBA?
You could try running the screen at 4K (or 1080p HiDPI) by just using a single DP cable from the MBA, and switching the R9A18 to single input mode.
Check if the same fault still shows ?
Does swapping the two DP cables over make any difference?
There looks like two possible problems:
The vertical stripe may be due to screen damage to the rear ribbon cable at the top of the screen where the fault is.
But your fault is different than a ribbon cable damaged by a sharp object when the screen was removed from the iMac.
Cutting into the ribbon cable just gives a black vertical line.
Does pressing on the screen at the top at the back where the line is make any visible difference?
The darkened right side of the screen may be a screen fault to the right side.
Or it might be a fault with the 40 pin eDP cable from the R9A18 to the right side of the screen.
Carefully check there is no damage to the eDP cable, or to the socket at each end.
Or it might be a fault in the R9A18. Faulty boards are unusual but not unknown...
If switching the cables over between the two R9A19 DP-in sockets makes a difference, then one DP cable is faulty.
Is there a Thunderbolt to Dual DP splitter?
Or are the two DP cables fed direct from the MBA?
You could try running the screen at 4K (or 1080p HiDPI) by just using a single DP cable from the MBA, and switching the R9A18 to single input mode.
Check if the same fault still shows ?
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Hi Paul, swapping DP cables makes no visible difference, nor does going single DP in. Indeed, I get the white vertical stripe even with no input cables plugged in and regardless of the input I select on the menu.
I marked the borders of the white stripe with tape and tried changing aspect ratios in the menu as well as input selection, but it stays same size and position. Not exactly sure what that's telling me.
Trying the press test now. Ugh. Left side of white line brightens and darkens when I press. Following that up I see its coming from an area near an LED and... I think I nicked the ribbon cable with the pizza cutter when I was removing the screen. See little black triangle right in the middle of this pic.
Damn. It was such a pretty screen before I did that.
On a positive note, the left side of the screen still looks lovely in 5K.
Any chance the screen ribbon cable is replaceable? Or is there a source for a reasonably priced screen? I suspect I'll just have to bite the bullet and find another used iMac locally.
I marked the borders of the white stripe with tape and tried changing aspect ratios in the menu as well as input selection, but it stays same size and position. Not exactly sure what that's telling me.
Trying the press test now. Ugh. Left side of white line brightens and darkens when I press. Following that up I see its coming from an area near an LED and... I think I nicked the ribbon cable with the pizza cutter when I was removing the screen. See little black triangle right in the middle of this pic.
Damn. It was such a pretty screen before I did that.
On a positive note, the left side of the screen still looks lovely in 5K.
Any chance the screen ribbon cable is replaceable? Or is there a source for a reasonably priced screen? I suspect I'll just have to bite the bullet and find another used iMac locally.
I wonder if anybody has had this. I got the r1811 borad (HDMI 2.1) version( firmware is v04). It is randomly turning on and off. The remote has stopped working as have the buttons on the control strip. It is pugged into Macstudio so no excess power draw issue. Tried with an Ipad and the same. I unplugged all the output cables and it still seems to have a mind of it's own with the control strip light turning on and off and sometimes the fan., as it it is trying to boot and failing.
Sadly I failed with my build, damaging the data connector on the LCD panel - I believe that's where the damage is anyway. The panel powers on from JRY-W9CUHD-AA1 I purchased.
I no longer have the stomach to throw more money at this project.
To that end, if there's anyone in the UK interested, I've got the mac up on eBay - full description there.
I've got it on auction, with an optional buy now for £260, however, I highly doubt it's going to fetch that much - very niche market for faulty imacs!
Moderators, I'm sure you'll let me know if posting this is a no-no:
I no longer have the stomach to throw more money at this project.
To that end, if there's anyone in the UK interested, I've got the mac up on eBay - full description there.
I've got it on auction, with an optional buy now for £260, however, I highly doubt it's going to fetch that much - very niche market for faulty imacs!
Moderators, I'm sure you'll let me know if posting this is a no-no:
Apple iMac 27 Inch - 5K Desktop A1419 2017 - i5 3.5GHz 40GB Ram - faulty | eBay UK
StoneTaskin JRY-W9CUHD-AA1 For iMac 5K A1419 LG Display LM270QQ1/QQ2 Driver Board DP HDMI2.0 60HZ 10bites 5120X2880 DIY Monitor. imac A1418 A1419 A2115 2 Way Treble Bass Speaker Crossover Audio Tweeter Woofer Crossover Speakers Filter Frequency Divider.
www.ebay.co.uk
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