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hitz
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Last Activity: 08-03-2014, 02:26 PM
Joined: 01-02-2013
Location: os
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  • hitz
    replied to acer AL2216W -green column displayed continously
    in Troubleshooting Computer Displays
    Re: acer AL2216W -green column displayed continously

    That's a good point. There are really some of the conductive pads loosened from the ribbon's plastic. Is it okay to put a minimum amount of superglue under them to fix this?

    /e: Answered that question on my own. But that brings me to a new one:

    HOW DO YOU KNOW THAT IT'S THE SOURCE OF ALL EVIL?

    It's fully back in life (see the new pictures). Thank you so much! ...
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    Last edited by hitz; 01-31-2014, 10:36 AM.

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  • hitz
    replied to acer AL2216W -green column displayed continously
    in Troubleshooting Computer Displays
    Re: acer AL2216W -green column displayed continously

    Thanks for your reply. I attached a photo where I marked the spot I saw the spark. So I share your opinion of having connected the Vin to the V5A pin.

    As a lack of knowledge I dont know how to go on checking it. What kind of information is being lead to the panel driver (which i guess is the circuit board on the top)? Is it just the order to put column X and line Y in blue or is it more complex? What's the RTD2553VH for?

    /e: Okay, I found the datasheet for the RTD2553V, which is the driver IC:
    ...
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    Last edited by hitz; 01-31-2014, 09:43 AM.

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  • hitz
    started a topic acer AL2216W -green column displayed continously
    in Troubleshooting Computer Displays

    acer AL2216W -green column displayed continously

    Hi,
    it's me again with my little baby :/ Due to the lots of (dis-)assembling the ribbon cable to the button board had a crack. So I soldered 15 wires on the soldering points of the boards to reconnect them properly. After having finished I wanted to test the functionality, plugged in my DVI cable, then the power cord. No picture appeared - I forgot to connect the two ribbon cables to the panel... So I unplugged both cables again and there I made the mistake not to wait for all caps to lose their load. While connecting the left ribbon cable, there was a little blue spark in the right (area...
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  • hitz
    replied to (again) AL2216W - 15s to black
    in Troubleshooting Computer Displays
    Re: (again) AL2216W - 15s to black

    So, it took a little longer than expected. The dealer I first tried sent the wrong part, so I had to choose another one. He delivered the correct CCFLs today.

    While disassembling the display enclosure, I recognized one of the old CCFLs is burnt (black spot 1cm from the end). There seem to be high temperatures during use: the clear pane hat some brown spots on its edge. So I replaced both CCFL, soldered the old connectors to it, tested it: IT WORKED!
    So I reassembled it, and took the picture attached. Sorry for not documenting...
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  • hitz
    replied to (again) AL2216W - 15s to black
    in Troubleshooting Computer Displays
    Re: (again) AL2216W - 15s to black

    Thank you both so far. I thought I had an old scanner, but I can't find it. There would've been a CCFL nearly same sized in it. So I just ordered one for less than 5€, if it works it would be a cheap repair. Hope the part is delivered before the weekend. I'll report in any case.
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  • hitz
    replied to (again) AL2216W - 15s to black
    in Troubleshooting Computer Displays
    Re: (again) AL2216W - 15s to black

    I just tried the other way round. I used my inverter to check the display's CCFLs. That made me realize that the CCFL connected to the top connector (top left corner as seen from front) seems to be broken. Trying to let the display run with only three CCFLs connected brings the monitor into standby mode before the acer logo shows up.

    @budm: What solders you mean? I didn't recognize a faulty solder when visual testing, but didnt measure all of them. I only tested the power line for the MOSFETs next to the transformers, because I recognized...
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  • hitz
    replied to (again) AL2216W - 15s to black
    in Troubleshooting Computer Displays
    Re: (again) AL2216W - 15s to black

    Thank you for your reply, Lumberjack. The only CCFLs I own, are two blue ones with a length of 10cm each ([URL="http://www.sharkoon.com/?q=en/content/mini-ccfl-2-1-kit"]like those[/URL]). Both are connected to the same inverter. Unfortunately they have different connectors than the CCFLs in the display. So I hope someone can tell me if the test would work with those CCFLs, so I can start and solder to make them connectable.

    Attached you'll find the new pictures of the circuit boards, with a detailed view on the inverter/CCFL...
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  • hitz
    started a topic (again) AL2216W - 15s to black
    in Troubleshooting Computer Displays

    (again) AL2216W - 15s to black

    Hey guys!

    As it seems, my Acer AL2216W is getting old. I thought my last thread was longer ago [URL="https://www.badcaps.net/forum/showthread.php?t=25282"]than it acutally is[/URL]. But I dont want to replace the monitor without even trying to repair, because I bought it 7 years ago with my first ever earned wage. So I hope you can help me bringing it back to life for the third time

    Here is the problem: After turning it on it starts as usual (acer logo, light off+on, showing desktop). Then it takes nearly 15 seconds till the backlight turns off (LCD still...
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Today the parts arrived. I just soldered the new regulator to the circuit board - tested it - the monitor is working fine again!

    Many many Thanks for your fast and comprehensive help
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    I'll order some new, hope they will be delivered on saturday and 0.29€/pc is a good price

    I checked the voltage of the battery with my multimeter, positive 9.6V were shown, so I put the GND/ADJ pin to the battery terminal where the black tip was while measuring the voltage.
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Guess i just wrecked it. Shortened OUT and GND with my multimeter tip, 0V OUT since then.
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Yes, i just did. New 9V battery (delivered 9.6V) attached to the regulator gave me 3.6V from OUT-pin.
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    13 Ohms gone, 338 Ohms now (guess from the regulator OUT-GND).
    The voltage is the 1.27V I mentioned above (remeasure gave me 1.35V now), thats the circuit in which the sources of the status LED controllers are.
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    I removed the burnt one and reassembled the monitor as far as needed to test if it works now.
    Plugged it in -> no LED, no starting possible.
    I measured the Voltage of top 2 pins from the PSU: 1.11V giving me 1.27V on the circuit where the sources of the LED-MOSFETs and the OUT-pin of the regulator are in. Any new ideas? :/
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Ah okay. I unsoldered it and it gives me the 13 Ohms between GND/ADJ- and OUT-pad.

    Following the conducting path near the left cap you marked me (red) led me to the blue marked component. Ohm-meter gives me 13 Ohms between both pins and 0 Ohms between bottom pin and ground of the DVI-connector. The brown color implies that component being burnt, especially because its nearby "friends" are all black. What kind is it? It says "Z6" on circuit board and C2 (or 02?) on the component itself....
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Values are from the regulator itself. So I have to unsolder it again and measure between the connectors on the circuit board?
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    I just unsoldered the regulator. Its resistance values are:

    GND/ADJ - OUT: 338 Ohms
    GND/ADJ - IN: 1810 Ohms
    IN - OUT: 1491 Ohms

    Looks fine so far, I guess.

    I measured the caps you marked on the picture. I unsoldered one side of each one and measured eachs resistance, all infinte -> caps are fine too?
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Okay, i'll try it tomorrow. Thank you so far
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    U7 gives me 13 Ohms on middle pin vs. ground from the VGA connector, close enough to zero? =(
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  • hitz
    replied to Acer AL2216W / DAC-19M009 dead?
    in Troubleshooting Computer Displays
    Re: Acer AL2216W / DAC-19M009 dead?

    Its U7 in the middle and U6 in upper right corner. Both are labeled 50117K-G.
    The middle pin of U7 is directly connected to the source pins of both LED-MOSFETs I mentioned earlier.
    For measured voltages open the attached picture....
    See more | Go to post

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