LVDS magic and tv stuff - Page 1
Forum section: electronics / projects

author: itaroli
author_rank: Newbie
timestamp: July 17, 2014, 04:59:15 pm
content: Intro: please forgive any grammar mistakesDear fellow engineers, masters of electrons! I beg your help!So what we have here:I would like to use a projector in my room.After collecting some info of them I gone to see the prices, but I didnt liked what I seen.(best emoticon ever haha)Well I dont need a projector anyway I said, but then like a miracle, a random google search dropped in front of me this video.After realising what is this I immediately tought that I will build my own projector too.Lets jump in the electronic stuff.I found this TV with cracked screen for few bucks, and I would like to use its parts, to have some nice gui, and other cool functions.LG 42LA620Shttp://www.lg.com/hu/televiziok/lg-42LA620S-smart-3d-tv/technical-specificationssorry it looks like this model is not available with english spec.This is its main board:Sadly I dont have any more information/picture about this TVs inside.The question is, that could I drive any display from it trought the LVDS interface, or only FullHD like its original resolution, or only the original panel going with it?Although on the top of the board is it even an lvds connector?

author: Rasz
author_rank: Super Contributor
timestamp: July 17, 2014, 05:29:16 pm
content: its not universaleven at same resolution different panels have diff configurations (color depth, field order etc)

author: itaroli
author_rank: Newbie
timestamp: July 17, 2014, 05:35:49 pm
content: Are there any way to mod/hack it? Like service menu or something?Or are there any easily moddable boards like this?

author: itaroli
author_rank: Newbie
timestamp: July 17, 2014, 06:09:58 pm
content: Hmmmm does anyone know what kind of connector is this? (attachment)If this is lvds then it would be possible to convert it to displayport with this cable:http://www.lcd-cable.com/products_info/intel-Embedded-DisplayPort-cable-LVDS-KABEL-246618.htmlOr am I wrong?

author: IO390
author_rank: Regular Contributor
timestamp: July 17, 2014, 07:11:45 pm
content: Quote from: itaroli on July 17, 2014, 06:09:58 pmThat just looks like a generic connector for a flat-flex cable.

author: itaroli
author_rank: Newbie
timestamp: July 17, 2014, 10:31:21 pm
content: Its got 50pin I think, and it probably goes to the tcon panel, but lvds cables usually got just 30 pins.What else would be there on 20 lanes? I tought of power for the lcd on multiple lanes, but I dont think that would need 20.Although I requested more picture from the owner of the broken screen tv.

author: Rasz
author_rank: Super Contributor
timestamp: July 18, 2014, 03:02:10 am
content: Quote from: itaroli on July 17, 2014, 06:09:58 pmthis is not what you think it isprobably some particular one off product uses DP socket for lvds, or has a mode that lets you send lvds over its DP socket *Quote from: itaroli on July 17, 2014, 06:09:58 pmgood luck finding firmware for your partucular scaler chip (you dont even know what it is, you didnt remove the heatsink)you can buy universal interface boards on scam_bay, they start at ~$15 for simple VGA only, up to ~$50 for VGA DVI HDMI tuner combos.There are different, from ones that seller has to hardcode for you for particular panel (because they think keeping firmware secret makes the product better, silly chinese), thru boards with available moddable firmware (there as this malaysian/indian forum with a collection of all the firmwares for univercal controller,s but I forgot the link), ending up with newest ones that simply have jumpers with printed resolution/mode table on the back*Radeon GPUs for example have configurable output buffers and are able to use same pins for DVI and LVDS - yes, you could in theory drive LVDS directly out of DVI socked on radeon gpu (for example forxe xorg to output to lvds under linux)"I have written code to configure the various internal hardware blocks inside the GPU to enable output to a 8.9 inch 1024x600 netbook LCD directly using "LVDS"/FPDLink signalling from the DVI connector on the card. Normally it is not possible to interface a laptop LCD to a DVI port directly as the data encoding is different however as these GPUs are also used in laptop computers they may be switched into LVDS mode allowing the display to be attached directly."https://www.flickr.com/photos/73923873@N05/6667254969/in/set-72157628794295861

author: tom66
author_rank: Super Contributor
timestamp: July 18, 2014, 11:27:26 am
content: Did you keep record of the panel model #?You can look up the datasheet. (PM me, I might have one.) This will tell you the LVDS format. You will not be able to change the format on most TV mainboards.Also if the TV is FALD (full-array LED) be aware it will also want to communicate with an LED controller. If this fails the TV will usually refuse to boot up.

author: itaroli
author_rank: Newbie
timestamp: July 18, 2014, 05:54:35 pm
content: So the situation is, that this broken lcd tv isnt mine yet, but I will do my best to find out more information.You know I didnt wanted to buy it before some research.Also you guys are awesome!