Red vertical line on a led Acer pc monitor - Page 1
Forum section: electronics / repair

author: ThunderZed
author_rank: Regular Contributor
timestamp: May 15, 2023, 04:54:36 pm
content: I've got this old lcd Acer x193w monitor in a home PC building. It's connected to my PC by a VGA cable and by an IEC cable to my UPS to be supplied.Today an 1 pixel wide red vertical line appeared on the right side of this monitor in correspondence of its on/off button as soon as I switched it on in (See attachment); actually I've been pressing this button quite often along the years of usage, if it could be important.This line doesn't appears in screenshot images but appears in BIOS environment too and in both one of my OS environments and it appears even if its VGA cable is disconnected from my PC so I think this issue doesn't deal with my PC components; anyway this is my cfg:- amd ryzen 2200g with Vega 8;- msi b450-a pro (bios V10.7; 2019-03-07);- 2x4gb hyperx predator @3200 cl16 (working @2400 by default)- wd black 1tb hdd;- corsair cx450 PSU;- no graphic card.Honestly I don't know if this is a monitor electronic issue for sure or I've to consider other ways/things before trying to fix it, anyway I'd like to listen to your opinions.What do you think the problem is and how to fix it (if possible)?

author: eurgenca
author_rank: Regular Contributor
timestamp: May 15, 2023, 05:32:27 pm
content: Hello.Try to reconnect LVDS cable but probably your LCD screen is broken.

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 15, 2023, 06:34:39 pm
content: Lcd issue 100%, a bad cable would cause random image noise/corruption.

author: ThunderZed
author_rank: Regular Contributor
timestamp: May 15, 2023, 06:46:17 pm
content: (Taken from youtube) Is the one in the attachment the LVDS cable? Must I only disconnect and reconnect it?@DavidAlfa Are you talking about the LVDS cable too?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 15, 2023, 10:06:09 pm
content: trash it sorry but i think the lcd is defectiveyou say the red line is present with no signal .... did it receive an impact, a shock ?

author: ThunderZed
author_rank: Regular Contributor
timestamp: May 17, 2023, 12:56:09 pm
content: I'd like to give this lcd acer a chance before trashing it.My first attempt will be just disconnecting and re-connecting the LVDS cable and I think I must be very "kind" with its connector to avoid to damage it.I think it's quite funny to find videos on youtube that show monitors fixings because everything seems very easy! In the video I took my previous screenshot fromthe technician fixed the issues by changing a couple of capacitors as I could understand (my English is very bad!). Therefore I guess it could be interesting to remove the 2 boards (power and main) to see if there's a died capacitor but only in the case that reseating the LVDS clable won't solve my issue. Do you think it will be useless? Do you think it's more probable the cause relays on some IC?If it could be interesting I've found these 2 acer x193w service guides:1.http://monitor.espec.ws/files/acerv193w_728.pdf- you can find the lvds cable in the scheme at page 48- the troubleshooting chapter is at pages 35-38: 1) No Power; 2) No Picture; 3) Panel Power Circuit; 4) Keypad Board; 5) No Backlight2.https://data2.manualslib.com/pdf6/133/13262/1326159-acer/x193w.pdf?a75aa3652fc53cde496bc929116e0a84- the troubleshooting chapter is at pages 29-31: 1) No Power; 2) Missing Color; 3) Always show “NO SIGNEL” and you can find the "lvds signal" in the "Missing Color" flow chart with the CN8 connector which would be a FFC-30/NC connectorDo you think there could be something interesting to point our attention to within the troubleshooting flow charts? Eg. some capacitors or transistors or else?

author: wasedadoc
author_rank: Super Contributor
timestamp: May 17, 2023, 03:34:32 pm
content: That is almost certainly a fault in the LCD panel itself. In which case the only fix is replacement.

author: mengfei
author_rank: Regular Contributor
timestamp: June 26, 2023, 01:51:35 am
content: Very Very seldom those kind of LCD problem goes beyond the LCD like loose solder or connection, 99% of the time the LCD is faulty.Had a few of those in the past.

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 26, 2023, 02:01:43 am
content: Perhaps paradoxically it's more likely to be an easy connector/board replacement repair if the problem happens for the whole screen. Such as corrupted screen, no signal, or completely dead.A single strip or other localized pixel fault however is more likely to be the panel itself.