HannsG HH241 problems

Collapse
X
 
  • Time
  • Show
Clear All
new posts

  • Xcat2008
    replied
    Re: HannsG HH241 problems

    Dont know if this will Help.. but i had my Samsung T190 with the same or similar symptoms...

    Sometimes work's good for Hours, some times 5 mn and Turn off.. And sometimes never turn on and only after few Switch on and Off get it working.. So open it up, and had some capacitors damaged... So i have replace them all.. And is still working for about 3 years

    So i hould suggest you maybe replace all the Capacitors since they are cheap... or maybe check in the back of the board if you have Broken Solder...

    Sometimes the problem is smiling for us, and we cannot see it hehe

    Good luck

    Last edited by Xcat2008; 09-15-2015, 07:25 AM.

    Leave a comment:


  • vinceroger69
    replied
    Re: HannsG HH241 problems

    top left diode the bottom edge does not look like its touching the heatsink maybe just the picture but if you zoom in on it you will see yourself.

    Leave a comment:


  • Dougmeister
    replied
    Re: HannsG HH241 problems

    Can someone please point out the heatsink that has the double diode not connected correctly?

    Leave a comment:


  • Dougmeister
    replied
    Re: HannsG HH241 problems

    Sorry. I was responding to this comment above:

    "from pic 3 i see one of the 2 double diodes on heatsink that seems not connected well to heatsink,"

    Where are the diodes that aren't connected well to one of the heatsinks?

    Leave a comment:


  • budm
    replied
    Re: HannsG HH241 problems

    "Where exactly is the heat sink in photo #3?"
    http://jdw10.com/pics/3.jpg

    There are three heatsinks, I do not understand what you are asking.
    Attached Files
    Last edited by budm; 09-11-2015, 10:27 PM.

    Leave a comment:


  • Dougmeister
    replied
    Re: HannsG HH241 problems

    Nothing like bringing a thread back to life after a year and a half...

    I *finally* am making time to get back to this project.

    Where exactly is the heat sink in photo #3?

    Leave a comment:


  • Davi.p
    replied
    Re: HannsG HH241 problems

    Dougmeister you better make some measurements before order parts if don't want to trash time and money, from pic 3 i see one of the 2 double diodes on heatsink that seems not connected well to heatsink, to test the outputs simply switch on the board, even with video board disconnected, set tester in volt, place the red probe to the center pin of the 2 double diodes on h.sink , the black prb to the h.sink or a board screw.
    Zomalaja: i don't see discoloration. When you turned on before fixing it showed the image?

    The most important thing: do you see a status led lit after the mon. stop working? Remain same colour?
    Last edited by Davi.p; 04-27-2014, 04:02 PM.

    Leave a comment:


  • Dougmeister
    replied
    Re: HannsG HH241 problems

    I have not been able to get the bulbs, etc. needed to test the power supply and main board, so I'd like to just replace all the capacitors.

    Can someone help me figure out which caps to order and from where? I guess I should order the SRF 1020 and the 10 Ohm resistor while I'm at it...

    Leave a comment:


  • Zomalaja
    replied
    Re: HannsG HH241 problems

    I have an HH241 that did that same thing, turn on then go blank - my caps were bulging a little. I replaced them but also replaced the dual diode SRF 1020 as well as the 10 Ohm resistor. I see in picture #5 that the board is discolored just as mine was. The part I used was a Taiwan Semiconductor SRF 1020, 10A, 20V, Dual Schottky Rectifier, Isolated. They had no stock so I had to wait for a sample from overseas, but it's working fine now.

    Leave a comment:


  • Dougmeister
    replied
    Re: HannsG HH241 problems

    Originally posted by budm
    You need to monitor the voltages, usually 5V for the main board, and voltage (14~17V) for the backlights inverter when it is working and when it is not working. Is this really 24" monitor? Pretty small power supply-inverter for 24"
    Can someone point me in the right direction as to how to test these voltages?
    * 5V for the main board, and
    * voltage (14~17V) for the backlights inverter

    I don't know where to put the leads of the multimeter. Thanks.

    Edit: I guess the first link in Bud's signature would be a good place to start?
    "Basic LCD TV and Monitor troubleshooting guides"?
    Last edited by Dougmeister; 03-25-2014, 04:59 PM.

    Leave a comment:


  • Agent24
    replied
    Re: HannsG HH241 problems

    Originally posted by Dougmeister
    I tried testing the caps still on the board using the digital multimeter "trick" (set to Ohms, charge the caps a bit, then switch the multimeter to "volts" and see if the numbers slowly decrease). I know the test isn't foolproof, but it says all the caps are still good.
    You can find open\shorted capacitors that way, but that's about it. Unfortunately you will not find out if they have high ESR or low capacitance, which is what really matters in this kind of situation.

    Yes it could well be something other than the capacitors. Bad lamps or some problem with their wiring, or inverter problem, all can cause random shutdowns.

    Try what budm suggested, to start with.

    Leave a comment:


  • budm
    replied
    Re: HannsG HH241 problems

    You need to monitor the voltages, usually 5V for the main board, and voltage (14~17V) for the backlights inverter when it is working and when it is not working. Is this really 24" monitor? Pretty small power supply-inverter for 24"
    Last edited by budm; 03-13-2014, 11:31 PM.

    Leave a comment:


  • Dougmeister
    started a topic HannsG HH241 problems

    HannsG HH241 problems

    It's been awhile since I tested it, but it seems to me that it would work for a while, then power off.

    Here are some screenshots of the capacitors.

    I tried testing the caps still on the board using the digital multimeter "trick" (set to Ohms, charge the caps a bit, then switch the multimeter to "volts" and see if the numbers slowly decrease). I know the test isn't foolproof, but it says all the caps are still good.

    I don't see any major leakage or swelling in the tops of the caps. I've only ever fixed one LCD monitor before and that was the problem.

    Could it be the power supply or something other than the capacitors? What should I do next?

    Thanks.

    Pic 1
    Pic 2
    Pic 3
    Pic 4
    Pic 5
    Pic 6
    Pic 7

Related Topics

Collapse

  • 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
  • ant3202
    HP 27es - LED monitor - Monitor Flashing On - Off
    by ant3202
    Hi Everyone

    Lately I am experiencing the deja-vu incident on one of the led monitor like this.
    https://www.badcaps.net/forum/troubl...lashing-on-off

    The monitor is HP 27es LED Monitor
    https://h30434.www3.hp.com/t5/Deskto...e/td-p/6804692

    The monitor will randomly blackout and display no signal and will recover again.
    Sometimes need to power and off again to restore the display but...
    03-20-2025, 07:30 PM
  • 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
  • momaka
    Wise Wing F199 19'' LCD monitor - recapped
    by momaka
    Looking through my repair pictures and notes, it's been a long time since I posted anything in the LCD monitors section. So here goes that.

    I'm dedicating this thread to one of the very first LCD monitors I repaired (if not the first one), which was more than 10 years ago now. The monitor is a Wise Wing, model F199. It's a 19” CFL-backlit LCD. I got it for free off of Craigslist in 2009 from a guy, who said he bought it for cheap from Wallmart and the monitor worked only for a little less than 2 years before quitting.

    When I saw the Craigslist post, I wasn't...
    08-24-2020, 10:58 AM
  • 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
  • Loading...
  • No more items.
Working...