1706b No power, no led light

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • Tomab
    New Member
    • Nov 2011
    • 5

    #1

    1706b No power, no led light

    One of my Acer AL1706b monitors finally died recently. After doing some research here and elsewhere on the internet I'm not sure how to proceed from here.

    After checking the T2A/250VAC fuse I moved onto the 82uF 450V capacitor (170V). Then the wires heading from the power board (ILPI-003 REV:C - 2006.06.19) to the logic board.

    From bottom to top the wires are:
    1.VCC5V - 5V
    2.VCC5V - 5V
    3.GND - 0V
    4.BRIGHTNESS - 0V
    5.ON/OFF - 0V
    6.GND - 0V


    Assuming that's what they should be I moved onto the logic board. After reading PlainBill's Post in a different thread I took down the following readings:
    U101:
    1. 0V
    2. 1.27V
    3. 5V

    U102:
    1. 0V
    2. 1.85V
    3. 5.2V


    After consulting page 5 (or 44) of AL1706x.pdf I was lead to believe these are not the correct voltages for these regulators. Could it be as simple as replacing these two regulators?

    I got excited that perhaps I would just be able to short or remove U406 (Reset Controller) however that component would not appear to be present on my board.

    I'm not sure how to proceed from here but I'm sure the vast knowledge of the internet will point me in the next direction! Thanks in advance for any help or guidance anyone can offer me. Also, sorry for the blurry pictures, my camera is very sad. I can have my friend take far better pictures if necessary.

    I have used the following threads as resources:

    https://www.badcaps.net/forum/showthread.php?t=7021
    https://www.badcaps.net/forum/showth...ghlight=max810
    https://www.badcaps.net/forum/showthread.php?t=8239
    https://www.badcaps.net/forum/showthread.php?t=11058
    Attached Files
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: 1706b No power, no led light

    Originally posted by Tomab
    Assuming that's what they should be I moved onto the logic board. After reading PlainBill's Post in a different thread I took down the following readings:
    U101:
    1. 0V
    2. 1.27V
    3. 5V

    U102:
    1. 0V
    2. 1.85V
    3. 5.2V
    What is the part number for U101 and U102 on your board? If it is something like AL1117-33, the suffix (33) denotes the output voltage. If that is the case, then pin 2 at 1.27 V has failed.
    Last edited by retiredcaps; 11-27-2011, 02:57 AM.
    --- begin sig file ---

    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

    Please do not post inline and offsite as they slow down the loading of pages.

    --- end sig file ---

    Comment

    • Tomab
      New Member
      • Nov 2011
      • 5

      #3
      Re: 1706b No power, no led light

      Originally posted by retiredcaps
      What is the part number for U101 and U102 on your board? If it is something like AL1117-33, the suffix (33) denotes the output voltage. If that is the case, then pin 2 at 1.27 V has failed.
      U102 has part number A1 AS1117L-18 B0548. Pin 2 is reading 1.78 V.
      U101 has part number A1 AS1117L-33 B0551. Pin 2 is reading 1.27 V.

      Thanks for the info. After re-reading Bw1's post I realize now I have an identical issue. I wish the op of that thread had posted whether or not a new U101(1117L-33) had solved his problem or not. I'm going off now looking for this part in my junk boxes.

      If I have no experience soldering where should I start? I imagine I should practice on some junk boards removing and adding components. Can someone point me to a clear guide on this? Also my only tool for this would be a 30 watt wood burner, with "soldering" tip. Would this tool be a good tool for this job?

      Thanks again for your advice. I'm so happy to have found a resource like badcaps.net
      Last edited by Tomab; 11-27-2011, 12:08 PM.

      Comment

      • jetadm123
        Badcaps Legend
        • Feb 2010
        • 2169

        #4
        Re: 1706b No power, no led light

        YouTube videos are a good source for learning how to do something. Enter "how to solder" on the serach box and pick a video that's you're comfortable with.

        I would suggest using at least a 40W soldering iron, since the tab of the regulator is soldered to the board and requires a bit more heat to dislodge. RadioShack is acceptable for purchasing soldering products. Cheaper on Ebay if you're willing to wait.

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271

          #5
          Re: 1706b No power, no led light

          Originally posted by Tomab
          If I have no experience soldering where should I start?
          If you only have 7 minutes, this is the best video

          http://www.youtube.com/watch?v=I_NU2ruzyc4

          If you have more than 1 hour to watch, then see Dave Jones' soldering tutorial. It covers everything from irons, types of solder, techniques for soldering, etc

          http://www.eevblog.com/2011/06/19/ee...-part-1-tools/

          http://www.eevblog.com/2011/07/02/ee...torial-part-2/

          http://www.eevblog.com/2011/07/18/ee...surface-mount/
          --- begin sig file ---

          If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

          We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

          Please do not post inline and offsite as they slow down the loading of pages.

          --- end sig file ---

          Comment

          Related Topics

          Collapse

          • sam_sam_sam
            Lithonia Lighting versus Light of America Compact Fluorescent product quality
            by sam_sam_sam
            I have a Lithonia Lighting 65-Watt Gray Hardwired Compact Fluorescent

            I also have back when Light of America had these light bulbs available for yard lights

            The issue with Light of America was the blast boards had all most certain board failure while bulbs hardly ever fail

            While the Lithonia lighting fixture has all most certain bulb failure

            So I have modified the Lithonia lighting fixture to accept the Light of America light bulb and see how long this will last

            I have only had this light fixture for not more than a year if it...
            07-02-2023, 03:45 PM
          • Document Archive
            LG Gram Ultra-light Weight Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the LG Gram Ultra-light Weight 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 Ultra-light Weight boardview and Ultra-light Weight 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 that any specification, datasheet,...
            09-07-2024, 03:40 AM
          • Document Archive
            LG Gram Ultra-Light Laptop Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the LG Gram Ultra-Light Laptop 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 Ultra-Light Laptop boardview and Ultra-Light Laptop 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 that any specification, datasheet,...
            09-06-2024, 09:10 PM
          • Document Archive
            LG Gram Ultra-Light Laptop Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the LG Gram Ultra-Light Laptop 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 Ultra-Light Laptop boardview and Ultra-Light Laptop 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 that any specification, datasheet,...
            09-06-2024, 08:40 PM
          • serious_electron
            Strange! Acer laptop not powering on but charging the battery (orange light on when charger and battery plugged in).
            by serious_electron
            Hello Everyone!

            I have an Acer Aspire A315-42 laptop. I generally leave it on for long time by closing down its lid (so it enters the sleep mode). Recently, it rained quite heavily in out area. And the humidity and moisture seem to be high. So one late evening, after I opened the lid and turned on the laptop, it did power on as the blue light turned on but after it booted to the desktop screen, just 5-10 seconds after both the screen and blue light went out and laptop shut down (the blue power light turned orange). And after 2-4 seconds that orange light went off and the laptop died.
            ...
            06-28-2025, 02:57 PM
          • Loading...
          • No more items.
          Working...