V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • AutoMechanic
    New Member
    • Mar 2017
    • 9
    • USA

    #1

    V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

    Hey there guys, truly hidden gem here on the internet. Not sure how 'hidden' it is, but I just hadn't stumbled upon this forum yet. Sorry, that could've gone in my intro post.

    Anyhow, I have a V7 D22W12 LCD monitor which I'm pretty sure just needs a little TLC, and it may become usable again. Once connected, it will display a desktop for ~2 seconds, then go blank. My internet research on such matters suggests fried capacitors. I have fixed circuit boards previously with my tremor riddled hands, and figured, why not give this one a shot?

    I pulled apart the LCD down to the power inverter board. I do indeed see one 1000uf 25v cap with a buldging lid and white goo. Another blue coin shaped cap has similar goo. Interestingly, every pic I've found of this board shows that blue coin shaped cap with white goo. For instance:

    https://m.aliexpress.com/item/32274872296.html

    Dead center of the pic is the white goo on the cap. Directly left of that behind the heatsink is a taller, green cap. That is the bludging goo covered cap on my board. That pic actually appears to show a bit of white goo too, perhaps the goo is normal?

    If the goo is normal, then maybe I just need to try to replace the 1000uF 25v cap. Without a RadioShak nearby, which website to you guys favor for caps?

    Assuming the goo is abnormal, could somebody help me identify that blue coin shaped cap? My eyes can't make out the TINY writing on it.

    ILPI-033 1
    REV: C
    2008/05/15 is the board identification.

    The caps in question are C815 (bludging tall green one) and C823-1 (round blue coin one)

    I found somebody else refering to the ILPI-033, and thought the PDF there might help, but I couldn't make heads or tails of it.

    https://www.badcaps.net/forum/showth...light=ilpi-033
    Post 9 & 12

    I can submit pics if needed. But the top pic is my board.

    Thanks in advance for your help.
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

    Yep, please post picture of your power board.
    Anyway, this issue is indicating a backlight failure : either the CCFL themselves or the inverter. See the sticky thread https://www.badcaps.net/forum/showthread.php?t=10419

    The white stuff on the caps is glue, nothing wrong with it as long as it is not discolored. If it is, remove it.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • AutoMechanic
      New Member
      • Mar 2017
      • 9
      • USA

      #3
      Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

      I'm new to LCD repair, so CCFL is like the CFLs that were supposed to replace incandescents, but didn't work well? I take it that is the light source behind the LC's?

      The screen does work perfectly for a moment, so they clearly light, but by reading the sticky, it seems like one of the bulbs may be overtaxing the circuits, and you elimate that possiblity by swapping in known good CCFLs?

      Forgive me, away from keyboard, in WVA...On a phone, so typing is exhasiting.

      Anyhow, I'm glad to hear the white is merely glue. Several pics of same board show same spots of white goo. Anyhow, visually I only noticed the one cap that appears to have bulged the lid up. Also not terribly familiar with replacing soldered bits. Will I need to desolder, if so is the braided wicks the way to go?

      Will post pics when I get home tomorrow. Thanks again for the info.

      Comment

      • AutoMechanic
        New Member
        • Mar 2017
        • 9
        • USA

        #4
        Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

        https://youtu.be/umsr1suOZ28

        Just stumbled upon this video while educating myself on cap replacement on PCBs. Exact same LCD, exact same failed cap. Looks like a different brand cap, but same location.

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France

          #5
          Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

          Chances are this is indeed the problem.
          This should be easy to replace, you don't even need to remove the solder (but it is often better). Add some fresh solder on the pins of the capacitor on the back of the board, heat them up and gently pull the cap. While you're still heating the pads, insert the new capacitor and add some fresh solder after the cap is in place.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment

          • AutoMechanic
            New Member
            • Mar 2017
            • 9
            • USA

            #6
            Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

            Update: I've got caps coming in the mail tomorrow, so the monitor will go under the knife in the evening. Hopefully post a 'Wahoo' post shortly after.

            I know these pics suck, I've seen the suggestions of taking pics during full sunlight, but I have NOT found anytime during the day to do such a thing.
            Attached Files

            Comment

            • AutoMechanic
              New Member
              • Mar 2017
              • 9
              • USA

              #7
              Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

              Oh BadCaps.net forum, how I've failed you! I finally got my replacement caps in the mail today. Did some pretty novice cap replacement, but I did manage to replace the obviously bad cap. Reassembled the screen, hung it on the wall...


              ...and...


              I haven't a stinking video cable to test it with. The monitor has VGA or DVI inputs. I've got HDMI cables, but no simple VGA or DVI. The CRT that I'm using to type this sob story has a fixed in place VGA cable. It cannot be removed from the back of the screen.

              I can confirm the monitor 'boots', says 'No Input Signal' then switches to standby, and the green LED turns orange. Pretty sure it did that at least before. So no clue if I'm good or not. Will have to steal a VGA cable from work tomorrow to test it out. So frustrating!

              Comment

              • piernov
                Super Moderator
                • Jan 2016
                • 4435
                • France

                #8
                Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                If you've got a DVI to HDMI adapter, it may work if you use it on the monitor's side.
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                • AutoMechanic
                  New Member
                  • Mar 2017
                  • 9
                  • USA

                  #9
                  Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                  Success! I was able to obtain an VGA cable early this morning from an undisclosed source. Monitor is looking good.

                  (Picture was taken before color adjustment. The pinks are white after adjustment)
                  Attached Files

                  Comment

                  • Ago$tino
                    New Member
                    • Jan 2022
                    • 4
                    • Italy

                    #10
                    Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                    Kindly, could you tell me what is the value of the R506 and R525 resistor? I can't understand the colors.

                    Attached Files

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada

                      #11
                      Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                      R525 = 3megΩ 5%, Can't make out R506 but it looks the same. These resistors are also rated 3KV
                      It looks like just the outer coating is cracked, I suspect the resistors are ok.
                      Last edited by R_J; 01-10-2022, 12:41 PM.

                      Comment

                      • Ago$tino
                        New Member
                        • Jan 2022
                        • 4
                        • Italy

                        #12
                        Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                        However I discovered that one of the inverter stages is not working, and probably after a few seconds it goes into protection and the black screen appears.What should i check?
                        Attached Files

                        Comment

                        • R_J
                          Badcaps Legend
                          • Jun 2012
                          • 9535
                          • Canada

                          #13
                          Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                          Check the resistance of the secondary windings on the t501 and T502 transformers and see if they are the same, or is T502 higher or lower in resistance. Try switching the ccfl lamps from CN503 and CN504 to CN501 and CN502 to see if the shutdown is caused by a bad ccfl.
                          Also inspect the 2 blue ceramic caps in the output, on some models they can be bad and short when there is high voltage present.
                          Last edited by R_J; 01-10-2022, 03:14 PM.

                          Comment

                          • Adenitz
                            Senior Member
                            • Jan 2021
                            • 122
                            • Congo

                            #14
                            Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                            Is there some kind of tutorial, to explain the basics of how LCD computer displays work?
                            I want to learn what are the basics sections of the power supply board. I know most displays have two boards inside (or three if you count the board with command buttons).
                            One is the power supply board (mostly yellow color) and it has Power AC input part with diode bridge rectifier and big electrolytic capacitor (400 V DC), and then there is a part to produce high voltage (amplitude and frequency) to produce backlight.
                            I know that most computer monitors have 5V and 12V on this board. I would like to learn the basic sections of this power supply board since most of the time, the problems are located here.

                            Ago$tino placed the nice schematics. It would be good if someone recommend appropriate tutorial if there is one about the computer LCD/LED monitors.
                            Most I found on youtube explain how to replace caps, but I'd like to learn how this is structured.

                            Thank you.

                            Comment

                            • Ago$tino
                              New Member
                              • Jan 2022
                              • 4
                              • Italy

                              #15
                              Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                              Ok, I checked the transformers and they are efficient, same homs, then I checked the 4 blue ceramic capacitors and strangely the tester does not read them. They are the C506, C509, C523 and C528. All four are not read. I've tried other capacitors I have in stock and the meter reads them all.
                              Attached Files

                              Comment

                              • R_J
                                Badcaps Legend
                                • Jun 2012
                                • 9535
                                • Canada

                                #16
                                Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                                The capacitors are likely good, the value is too low (3pf) for those meters to check them. The transformers seem to be ok as well.
                                Last edited by R_J; 01-12-2022, 10:41 AM.

                                Comment

                                • Ago$tino
                                  New Member
                                  • Jan 2022
                                  • 4
                                  • Italy

                                  #17
                                  Re: V7 D22W12 Monitor 2 seconds to black ILPI-033 Caps

                                  no way! I can't get it to work. I ordered a led conversion kit. Then someone will give me a hand to identify on the diagram where to take the voltage to power the LED bar driver?

                                  Comment

                                  Related Topics

                                  Collapse

                                  • Rick_1234
                                    LG 23MP55HQ LED Monitor turns off after a few seconds or flickers.
                                    by Rick_1234
                                    Good evening, gentlemen.

                                    I have a problem with my monitor. It turns off after a few seconds or flickers. Shining a flashlight on the screen doesn't show any image, so I guess it's not the "2 seconds to dark" I read in the forum.

                                    To turn it back on, I have to press the power button twice. Then after a few seconds it turns off again or flickers. See video.
                                    https://drive.google.com/file/d/1L6S...ew?usp=sharing


                                    Things I tried

                                    - Bought a new AC adapter thinking that was the problem but the problem...
                                    06-22-2024, 04:44 PM
                                  • sew333
                                    Pc shutdown, monitor flickered with no signal after 10 seconds
                                    by sew333
                                    My pc:
                                    10850K stock 4800mhz stock Kraken X73 good temps
                                    2x16 GB DDR4 GSKILL 3000mhz XMP
                                    Seasonic Tx-850 Ultra Titanium
                                    Gigabyte Rtx 3090 Gaming OC
                                    Aorus Z490 Pro Gaming
                                    1 TB SSD


                                    4 weeks ago i launched Metro Exodus Enhanced and during cinematic advertisement part ( 30 fps ), pc just shutdown.
                                    Also monitor flickered with NO SIGNAL 10 seconds after shutdown. So only monitor and pc was affected.

                                    Next i pressed only power button, rebooted again and its fine again. Happened once and i cant reproduce.


                                    Power...
                                    02-22-2022, 10:27 AM
                                  • momaka
                                    HannStar Hanns-G HC194d LCD monitor repair
                                    by momaka
                                    Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
                                    03-15-2023, 10:17 PM
                                  • wattage
                                    AOC AG493UCX 49-inch monitor - Firmware request
                                    by wattage
                                    Hello Badcaps Community,

                                    I purchased a preowned AOC monitor that is not working and out of warranty. It was sold as not working. I am looking for guidance on self-repair. In particular, I am after the firmware for the monitor. At the end, I have included monitor model information and links to pics and vids of the issue.

                                    The problem is that it will not display a picture on any of its inputs. And the on-screen menu does not appear. The power button works properly. It powers on with the remote as well. But the on-screen menu does not appear, even when not connected to any...
                                    07-13-2025, 04:41 PM
                                  • Document Archive
                                    MSI Prestige P65 8RF-456NL Creator White Notebook P Specification for Upgrade or Repair
                                    by Document Archive
                                    This specification for the MSI Prestige P65 8RF-456NL Creator White Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the P65 8RF-456NL Creator White boardview and P65 8RF-456NL Creator White schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...
                                    09-06-2024, 07:46 AM
                                  • Loading...
                                  • No more items.
                                  Working...