lg driver display board problem - Page 1
Forum section: electronics / beginners

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 12:04:56 pm
content: hello , i have an lg flatron l204wt that has a dead display driver boardthe IC602 is missing from the board,i took it offi found this one in ebay that is the same onehttp://www.ebay.com/itm/LG-L194WT-LCD-Monitor-Driver-Controller-Board-1440-900-LG-D13-/200868867956?pt=US_Laptop_Screens_LCD_Panels&hash=item2ec4b7af74but its for 19'' as is says and its the exact same board.will it work if i buy it?

author: Simon
author_rank: Unknown
timestamp: September 28, 2014, 12:24:43 pm
content: how big is yours ? if the resolution of yours and the one this board is sold for is the same it should work, but I'm no expert.

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 12:40:29 pm
content: mine is 20''

author: Simon
author_rank: Unknown
timestamp: September 28, 2014, 01:02:19 pm
content: what about resolution, the key thing will be amount of pixels to control. I have a 17" and 19" monitor, but both are 1440x900 pixels, the 19" one will have slightly bigger pixels but same amount to control for the control board.

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 01:08:34 pm
content: if you see the back of the board..youll se lg l194/l204wthis means that it can handle my monitor too cuz i found another lg board that says exact the same thing but for 15,17 and 19'' displaysso i think it will work for my monitor the lg l204wtthe 19'' lg display have the same board the lg 194wtill buy it and hope this will workthe ressolution is 1680x1050

author: Simon
author_rank: Unknown
timestamp: September 28, 2014, 01:22:41 pm
content: it sounds like a match then, providing the 2 have the same resolution.

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: September 28, 2014, 01:26:41 pm
content: I noticed some differences which I highlighted.Without schematics it's hard to tell if it matters.

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 02:35:20 pm
content: can you tell me?

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 03:15:56 pm
content: here the schematicsl204whttp://savedonthe.net/download/565/lg_l204wt-s-bfq.htmll194whttp://savedonthe.net/download/576/L194-204WT-WTM-WTX-WTQ-__Q_EN.html

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: September 28, 2014, 03:31:32 pm
content: Quote from: christos on September 28, 2014, 02:35:20 pmLooks like it mightNOTwork right out of the box. (perhaps even do some damage if you try, but hey.... I'm no expert on this)You might want to look at the service manual first.http://elektrotanya.com/lg_flatron_l204wt_lm62b_sm.pdf/download.html(wait half a minute or so before the download link appears in the description below the previeuw)Page 24 contains the schematics of the scaler board and describes the differences between them.EDIT: fixed stupid omission of the word not

author: wraper
author_rank: Unknown
timestamp: September 28, 2014, 04:01:36 pm
content: Quote from: christos on September 28, 2014, 02:35:20 pmThere is a place for to different type of connector. Seems that all pads are connected in parallel. So they just solder either type of it at the factory. If your monitor do not use this connector, then it does not matter at all. But I suppose it is for button board connection, if it is the case, then just desolder it from the faulty buard and solder it to the new one. No need to remove second connector from the new board.

author: wraper
author_rank: Unknown
timestamp: September 28, 2014, 04:05:22 pm
content: Resolution is also different, so it won't work out of the box without reprogramming the firmware in IC503, likely cal and other data in eeprom IC502 and 2 EDID eeproms - IC701, IC702.You can use this board instead (not 100% guaranteed) if unable to find the right onehttp://www.ebay.com/itm/LG-L227WT-L207WT-L227WTG-LCD-Monitor-Controller-Board-1680-1050-LG-D33-/181066748524?pt=US_Laptop_Screens_LCD_Panels&hash=item2a286b526cThe same thing with the connector.

author: sunnyhighway
author_rank: Frequent Contributor
timestamp: September 28, 2014, 04:57:09 pm
content: btw, R502 (the big trough-hole one) seems to have 1 broken leg.

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 06:27:04 pm
content: i broke the leg of the r502the problem of this board is the main chip..something connects the ground to the 5v rail..thats why i broke the leg

author: christos
author_rank: Regular Contributor
timestamp: September 28, 2014, 06:34:26 pm
content: so ,if i buy one with the same resolution with mine,will it work?

author: Stonent
author_rank: Super Contributor
timestamp: September 29, 2014, 05:29:15 am
content: Check shopjimmy.com and see what board part number he has for your TV.

author: christos
author_rank: Regular Contributor
timestamp: September 30, 2014, 08:39:19 pm
content: ive got a new board ,,its a universal so it have only 6 input pins to power it up1:GND2:GND3:5V4:5V5:ADJ6:BLONand my power board has 11 pins1. 15V2. 15V3. GND4. GND5. 5V6. 5V7. GND8. NC <- not connected9. ON [(INVON) on the driver board]10. A/D [ DIM (DIMADJ) on the driver board ]11. P/D [ M/S (LAMPADJ) on the driver board ]where goes the BLON and ADJ to the power board?the driver board was for my 22'' display but i broke the screen 1 week agoso i want to test if this will work on my 20'' lg display