Help, killed my LVDS to eDP converter board in my Lenovo T430 - Page 1
Forum section: electronics / repair

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: December 23, 2018, 08:33:49 pm
content: So I bought one of those overpriced 1080p IPS upgrade kits for my Lenovo T430, came from aliexpress... It worked great, until my friend wanted to know if the board would work in his HP elitebook, which shares the same issue of having a shitty stock 40 pin LVDS screen.I figured I could just plug in the HP's screen cable into the board, since it had the same connector that the T430's screen cable hadAfter trying it in the HP (which did not work) it did not work in my T430 either. Backlight but no picture.I'd just try replacing the ICs on the board, but the bastards ground the numbers off...\Nothing on the other side of the board except LTE-2KT COOEROI 8/2018, presumably a model, manufacturer, and dateThis board is like over 60$ on aliexpress, and I do not want to wait for another one to come in, nor spend another 60$ on one.Does anyone know what these damn chips could possibly be, or why they died when connected to the HP? Would they need some special programming before being used? Is there any alternative to this board? The board came with its own cables for the input and output, so I'd imagine I'd need one with those pinouts.I'm willing to make my own or repair this one if I can get some knowledge on it works. I can't imagine converting an LVDS signal to eDP is that hard, the main chip likely handles it all, but I have no idea what the chip isI'm sure the remaining chips are voltage regulators and some sort of memory chip for storing configsAny help is appreciated! My main laptop is down until I get this repaired

author: coromonadalix
author_rank: Super Contributor
timestamp: December 24, 2018, 03:41:00 pm
content: In the end you may have to spend the 60$I dont think youll find the right part number, if you do, with ordering the parts, desolder them and put them back .....try to wet the top ic's if you see some numbers

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: December 24, 2018, 04:58:51 pm
content: Quote from: blueskull on December 24, 2018, 04:48:46 pmThat one's an eDP to LVDS, not the other way around...If we can find a chip, I can check the pinout with the board, the layout is very easy to trace.Quote from: coromonadalix on December 24, 2018, 03:41:00 pmSadly nothing came up from the wet finger trick. And desoldering this part would be easy, its not even BGA.

author: ThomasDK
author_rank: Regular Contributor
timestamp: December 24, 2018, 06:40:49 pm
content: Maybe IT6251The package matches...

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: December 25, 2018, 05:22:31 am
content: Quote from: ThomasDK on December 24, 2018, 06:40:49 pmSadly it looks like its a different package, 64 pins as opposed to the 56 pin one I have.Maybe its time to decap the chip and get some die shots

author: Rasz
author_rank: Super Contributor
timestamp: December 25, 2018, 03:28:51 pm
content: Quote from: blueskull on December 25, 2018, 05:30:49 ambingo, NewCoSemi NCS8801 with broken/non existent documentation made by a small fabless chinese companyhttps://bbs.thinkpad.com/thread-1148516-1-1.html$1 locally, $10 shipped in singleshttps://www.yoycart.com/Product/562629163608/

author: Armadillo
author_rank: Super Contributor
timestamp: December 25, 2018, 04:01:17 pm
content: NCS8801 Doc too large, so see schematics;

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: January 28, 2019, 04:13:12 am
content: UPDATE: Got my ICs in, the package appears to be absolutely identical, down to the location and size of the pin 1 marker dot that wasn't scrubbed off the original. However, no luck replacing it. Another one of the ICs on the board released the magic smoke upon powering up. Thankfully it didn't fry my motherboard like the converter board originally did.I'm going to have to call it quits here to be honest. There's just too much damaged on this board to keep chasing down mystery parts.I am tempted to try making my OWN converter board someday, since the T430 isn't the only laptop that suffers from rubbish screens, and I have a few spare chips now, since I bought several.Thanks for the help everyone!

author: knapik
author_rank: Regular Contributor
timestamp: February 10, 2019, 11:33:57 am
content: Quote from: iamdarkyoshi on January 28, 2019, 04:13:12 amI may be in the market for one myself in the not so distant future. I wouldn't mind helping out to recreate an open source version of the board.

author: TheNewLab
author_rank: Frequent Contributor
timestamp: February 14, 2019, 01:42:31 pm
content: Whoa!did you convert a T430 screen by simply changing the video chip?Same laptop screen??from HD to FHD??I'm so clueless...However, I would like to know more about that board for a T420,which the Lenovo link includes in the discussionThat's incredible!