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420 now supporting freesync!
Firmware Link and directions:
Thanks to @Nom for providing the information!
Got trigger happy and decided to Guinea Pig one of these monitors.
Can't find any dead pixels.
Out the box in english
Has a delay of up to 20 ms over my Asus PB 287Q (TN panel listed at 1 ms)
Input lag when compared to Asus PB287Q TN 4k Panel
PB 287Q is about 20 ms faster.
No real visible bleed.
Much clearer picture than the PB 287Q
Aside from that, Not entirely sure what to check for or how. Anyone got any suggestions or requests?
Updated with pictures
View Angles:
Remote and controls:
Bezel being crappy:
Overclocking:
It does support 1080p @ 120hz but does not support 1440p at anything higher than 70 hz
Color:
Appears to be BGR instead of RGB
Blacks test out at 2:2:2 out the box
Big thanks to @wwllff123456 for the following Luminosity chart, and color calibration chart with ICC profile download link
![thumb.gif]()
Quote:
![thumb.gif]()
Firmware Link and directions:
Quote:
Originally Posted by Nom
Here you go :
UHD550420_FreeSync.zip 2297k .zip file
Wasabi Mango UHD420 Freesync Firmware Update
Code:
Code:Firmware Update method 1. Unpack the compressed files 2. Copy the file "MERGE.bin" to a freshly FAT formatted USB memory drive and plug into service port (USB). 3. Connect the monitor's power behind the monitor 4. Power On 5. When power is applied, LED will flash green to red. Wait until the flashing stops. The time is approximately three to four minutes 6. After the update, and then remove the USB memory Unplug the power from the wall outlet and power up again
Thanks to @Nom for providing the information!
Got trigger happy and decided to Guinea Pig one of these monitors.
Can't find any dead pixels.
Out the box in english
Has a delay of up to 20 ms over my Asus PB 287Q (TN panel listed at 1 ms)
Input lag when compared to Asus PB287Q TN 4k Panel
PB 287Q is about 20 ms faster.
No real visible bleed.
Much clearer picture than the PB 287Q
Aside from that, Not entirely sure what to check for or how. Anyone got any suggestions or requests?
Updated with pictures
View Angles:
Remote and controls:
Bezel being crappy:
Overclocking:
It does support 1080p @ 120hz but does not support 1440p at anything higher than 70 hz
Color:
Appears to be BGR instead of RGB
Blacks test out at 2:2:2 out the box
Big thanks to @wwllff123456 for the following Luminosity chart, and color calibration chart with ICC profile download link
Quote:
TheLostBrain Did some exploratory surgery on the WM UHD 420 for those that want to know about the internals. Big thanks to him on taking the risk and lots of good info here
Quote:
Originally Posted by TheLostBrain
Soo... Did a little exploratory surgery on the UHD420.
Good news! After putting everything back together it still works.![smile.gif]()
Bad news - Any hopes of "correcting" the backlight diffuser gap behavior mentioned in earlier posts is not really practical.
Oh well, at least learned some cool stuff:
LCD panel: LG LC420EQE (PG)(M1)
Just about an exact match here:
http://www.panelook.com/LC420EQE-PGF1_LG%20Display_42_LCM_parameter_24238.html
LCD Controller: Kang JIN K-4000
http://www.kangjintech.net/main/ad-board-k-4000/
Spec sheet:
http://www.kangjintech.net/main/download/BOARD/K-4000_REV0.2_SPEC_140514.pdf
Per spec sheet controller maxes out at 60hz for anything over 1080p...hence why success hasn't been had running at higher refresh rates, etc.
T-Con board: LG TM120 UHD
Interesting, per eBay listings it appears to be same T-con used on the panels in the LG 55UB8500 and 49UB8500.
http://www.ebay.com/itm/LG-TV-55-55UB8500-T-Con-Board-MODEL-V14-TM120-UHD-Ver0-5-P-N-6870C-0502B-/131452273875
http://www.ebay.com/itm/LG-49UB8500-UA-V14-TM120-UHD-VER0-5-6870C-0502B-TV-T-CON-BOARD-MODEL-/311339240684
Although I didn't capture a good picture of it, the reason for the backlight diffuser gap is due to the way LG incorporated the edge lighting in this display. The edge lighting assembly essentially sits on top of the diffuser and would somehow have to be moved out of the way before attempting to bring the backlight and diffuser closer to the lcd. Not to mention the plastic assembly that holds the LG panel together is designed around this and would also have to be modified. Yeah...it would be a pretty involved project to say the least.
Ok, some pics:
LG LCD Panel Assembly Tag
Basically what you see when opening up the UHD420 for the first time
T-Con Board shot 1
T-Con Board shot 2
T-Con Board shot 3
T-Con Board shot 4
LCD Controller shot 1
LCD Controller shot 2
LCD Controller shot 3
LG Panel Assembly showing some spacing. However, this is not the primary cause of the diffuser gap behavior.
LG Panel Assembly partially showing primary cause of the lcd diffuser spacing. You can see how recessed the diffuser film is...However, what you don't see here is that on the other side the edge-lighting assembly sits on top of the diffuser film and is the reason for the recess.
Speakers shot 1
Speakers shot 2
Fun fun fun. Hopefully useful or at least somewhat interesting to a few![smile.gif]()
Update - For the UHD420 HDMI 2.0 Version I'd say we can pretty safely say Wasabi Mango went with the new K-4500 LCD controller from the same Kang JIN company.
Ports shot from Accessorywhole eBay listing
K-4500 LCD controller shot with same exact ports configuration (minus usb ports - which both the k-4000 and k-4500 actually have support).
Product Page:
http://www.kangjintech.net/main/k-4500/
SpecSheet:
http://www.kangjintech.net/main/download/BOARD/K-4500_REV0.1_SPEC(150427).pdf
From the Timing Table in the specsheet it looks almost an exact match to the K-4000 so I wouldn't expect to much in terms of anything over 60hz when going 1080p or higher.
If you're not looking for hdmi 2.0 specifically I see not much reason in spending more for the newer model. Just my 2 cents... maybe better resell value though?
