Remote-Url: https://www.cnx-software.com/2021/09/06/how-to-repair-vga-monitor-flatron-w1934s/ Retrieved-at: 2021-09-09 18:00:34.982727+00:00 Skip to content CNX Software – Embedded Systems NewsCNX Software – Embedded Systems News CNX Software – Embedded Systems News News, Tutorials, Reviews, and How-Tos related to Embedded Linux and Android, Raspberry Pi, Arduino, ESP8266/ESP32, Development Boards, SBC's, TV Boxes, Mini PCs, etc.. Orange Pi Development BoardsOrange Pi Development Boards Menu • About □ About □ Contact Us □ Advertisement & Consulting Services □ Work for Us □ Support CNX Software □ Privacy Policy • All News • Raspberry Pi • Arduino • Reviews • Tutorials • Shop Posted on September 6, 2021September 6, 2021 by Jean-Luc Aufranc (CNXSoft) - 10 Comments on Your VGA monitor may be easier to repair than you think Your VGA monitor may be easier to repair than you think When a VGA monitor does not start at all, a common reason is that one or two capacitors are damaged. All you need to do to repair it is to replace them, and you’re good to go. It’s quite easier than you think, and I’ll show you how. I was tasked with repairing a VGA monitor, namely an LG Flatron W1934S, that would not turn on anymore. All I could see what the blue power LED blinking regularly, about every two seconds. Since so far, I had a 100% success rate in failing to repair TVs, I was not confident, and I thought maybe the monitor is some special state making it not turn on, as it happened to me with another monitor a few years ago. But a web search revealed the problem was probably a power supply board issue with one of the capacitors damaged and, in theory, all I had to do was to follow the steps in the video below. Safety warning: please note there are high-voltage capacitors so you’d better wait for a while after disconnecting the monitor for the mains before opening it. So let’s get started. The first step was to remove the stand which was not super complicated except I had to pull very hard to take it out. Then we were told to remove the back cover of the display. That’s nice, but I had no clear idea how to do it as I could not find any screws. It turns out the technique is to use an old credit card or a screwdriver to popup the back cover. I went with the latter and did a dirty job of it… Open LG Flatron W1934S VGA monitorOpen LG Flatron W1934S VGA monitor But at least managed to open it, and the following steps included unplugging several cables. Repair LG flatron W1934S VGA monitor: remove cablesRepair LG flatron W1934S VGA monitor: remove cables VGA monitor inverter cablesVGA monitor inverter cablesFour inverter cables We can now take out the main block that contains the power board and a smaller A/D board. VGA monitor power board analog boardVGA monitor power board analog board We’ll need to disconnect the cable running from the analog board to the power board, and loosen four screws from the latter to take it out, and at this point, it was clear what the problem was with a swollen C812 capacitor. LG Flatron W1934S VGA monitor power boardLG Flatron W1934S VGA monitor power board Swollen capacitor power supply boardSwollen capacitor power supply board So no need to check anything with a multimeter or an oscilloscope, a visual inspection of the board could immediately detect the issue. I even asked on Twitter using the first photo (minus the red highlight) for fun, and many people guessed it right, so it indeed appears to be quite a common problem. So I purchased a few 1000uF/10V capacitors online, and equipped with a solder pump and a soldering iron, I removed the damaged capacitor before soldering one of the new components. 1000ua/10V capacitor replacement1000ua/10V capacitor replacement Now it’s time to reassemble the VGA monitor, but before re-inserting the back cover that is a pain to take out, I tested the monitor, and… success!!! Woohoo!!! Repaired VGA monitor LG Flatron W1934SRepaired VGA monitor LG Flatron W1934S I reassembled everything, and I’ve now got a working VGA monitor. Total hardware cost for the repair: 24 Baht for 10 capacitors, or around 74 cents (7.4 cents per capacitor). Newly acquired knowledge: priceless! jean-luc aufranc cnxsoftjean-luc aufranc cnxsoft Jean-Luc Aufranc (CNXSoft) Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011. Share this: Support CNX Software! Donate via PayPal or cryptocurrencies, become a Patron on Patreon, or buy review samples Tagsdisplay, how-to, lg, tutorials, vga Related posts: 1. How to Use Nextion Serial Touchscreen Displays – Part 1: Standalone Mode 2. Stream Live TV to Your Computer or Smartphone with U4 Quad Hybrid Android TV Box, Kodi and TVheadend 3. Getting Started with RabbitMax Flex IoT and Automation Hat for Raspberry Pi 4. ESP8266, Mongoose OS & Grove Sensors – An Alternative Solution for Hackathons 5. Getting Started with ANAVI Light pHat Starter Kit with RGB LED Strip, Light Sensor Connect with: FacebookFacebook GoogleGoogle TwitterTwitter Subscribe Login Notify of [new follow-up comments ] [ ] [›] guestguest Label [ ] {} [+] [ ] [ ] Name* [ ] Email* [ ] Website [ ] I agree to the Privacy Policy The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Please read and accept our website Terms and Privacy Policy to post a comment. [ ] [Post Comment] guestguest Label [ ] {} [+] [ ] [ ] Name* [ ] Email* [ ] Website [ ] I agree to the Privacy Policy The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Please read and accept our website Terms and Privacy Policy to post a comment. [ ] [Post Comment] 10 Comments oldest newest Jens BauerJens Bauer Jens Bauer 3 days ago This is indeed a good post. You’re helping both people and the environment; people save money and they won’t throw away their broken electronics. -Even those who can’t fix their monitor themselves, can probably find someone who can change a capacitor. =) Reply SanderSander Sander 3 days ago A real electronics ingenieur at work! Well done. Reply TLSTLS TLS 3 days ago You might want to put a warning to go with this post, as the high-capacity capacitor on the AC side of the power board can cause some serious damage if it’s not discharged and someone touches it. Reply Jean-Luc Aufranc (CNXSoft)Jean-Luc Aufranc (CNXSoft) Author Jean-Luc Aufranc (CNXSoft) 3 days ago TLS Done. Reply TLSTLS TLS 3 days ago Jean-Luc Aufranc (CNXSoft) At least this way, you’re not going to get blamed if someone has an accident. Reply wboz88wboz88 wboz88 2 days ago TLS Yeah, personally I like to wait a few days at least. That’s probably overkill but generally something with a broken capacitor sits around broken long enough that it’s already been discharged by the time you fix it 😀 Reply WillyWilly Willy 2 days ago wboz88 The screwdriver between the leads works fine as well and should always be done anyway, to be certain (better discharge the cap on it than on your finger :-)) Reply WillyWilly Willy 3 days ago Great! A few points worth mentioning here: as you said, very often a blinking led indicates a dead capacitor most often, visual identification is sufficient to spot it/them: 99% of the time, a dead capacitor has its top bumped. The last 1% of the time (when there are not pre-cut lines on the top), they leak some fluid on the other side. You always need to change all bumped capacitors at once, because many of them are connected in parallel, and if you keep a dead one with a new one, the new one suffers much more from having to… Read more » Reply Laurent ROUXLaurent ROUX Laurent ROUX 2 days ago Bravo JL Travailler à ST mêne à tout. A condition d’en sortir. lol Je visite ton blog tous les jours. Cordialement LR Reply zmlopezzmlopez zmlopez 2 days ago If the problem is not so easy to find than a capacitor, you could always google the code found on the board or directly search it in aliexpress: ILI-071 in this case. You could find new working boards to replace yours for less than $20. Reply Advertisement Post navigation Previous PostPrevious Jetson Nano & Xavier NX carrier board offers 3x M.2 sockets, 10x RS232/RS485 interfaces Next PostNext Viomi V3 Max – A 3-in-1 sweep, mop and vacuum cleaner robot (Sponsored) Search for:[ ]Search Button Elkhart Lake moduleElkhart Lake module Trending Posts – Last 7 Days • Banana Pi BPI-R2 Pro 5-port Gigabit Ethernet router board is powered by Rockchip RK3568 19.9k views | 3 comments • Intel NUC P14E Laptop Element features Intel NUC 11 Compute Element 11.1k views | 8 comments • Your VGA monitor may be easier to repair than you think 10.1k views | 10 comments • OpenWrt 21.02 released with WPA3, HTTPS, TLS enabled by default 5k views | 28 comments • OpenRemote fully open-source IoT platform targets OEMs and DIY projects 2.8k views | 3 comments SPONSORS Gateworks rugged industrial IoT SBCGateworks rugged industrial IoT SBC UGOOS products 2021UGOOS products 2021 RK3399Pro SBCRK3399Pro SBC DS03 digital signageDS03 digital signage Station M2 Geek ComputerStation M2 Geek Computer Advertisement Recent Comments • itchy n scratchy on Argon EON – A 4-Bay NAS for Raspberry Pi 4 (Crowdfunding) • itchy n scratchy on Argon EON – A 4-Bay NAS for Raspberry Pi 4 (Crowdfunding) • Fossxplorer on iBASE MI989 – 5G-ready Ryzen V2000 Mini-ITX motherboard offers PCIe x16 & M.2 expansion • Jean-Luc Aufranc (CNXSoft) on Gearbest’s parent company is in “bankruptcy review” • Salvador on Argon EON – A 4-Bay NAS for Raspberry Pi 4 (Crowdfunding) Subscribe to Comments RSS Feed Advertisement Latest Reviews • Longer LK5 Pro 3D printer reviewLonger LK5 Pro 3D printer reviewLonger LK5 Pro 3D printer review & speed printing Hey, Karl here with a 3D printer review. 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