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enigmach
Member
Last Activity: 04-29-2012, 02:56 PM
Joined: 03-27-2012
Location: Groningen
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Just wanted to pop in and say thanks. I ran out of time for troubleshooting, so I ordered a logic board which came in today. Except for a slight flicker and a short buzz the first cold start it seems to work fine now.

    Thanks for all your help, I´m less afraid to repair my own electronics now
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power



    D701: 2.5 kOhm
    D600: 154 kOhm
    D603: 142 kOhm



    This one was hard to get a reading on: 1.4 kOhm



    I think you mean the BD600: 15.6 V
    C639: 1.82V
    The pins on CN400 read about 0.18V



    I couldn't get a Voltage over this..

    Again, thanks for the suggestions

    Would replacing the logic board be a good fix then? I've read that the CCFL could easily give me another year's worth of use out of it....
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Any other tips on what I could try? I'm currently in doubt whether it's worth it to replace the logic board in a monitor that's been used quite intensively for 4.5 years, especially when it's uncertain if it'll fix the problem..

    Thanks for your replies so far
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power



    cn200
    #1 : 0.01v
    #2 : 1.82v
    #3 : 1.83v
    #4 : 1.82v...
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    I´ve been a bit busy, but I just got round to measuring again.
    With the power button, something weird seems to be going on. For starters, there was no proper grounding screw so I took the frame to which the button normally is grounded.
    That aside, the voltages were very erratic. The only reading I got was on the one with the blue circle, which jumped around from 0 to 1.8V.

    After this, I took the advice of measuring some testpoints on the back of the mainboard. The ones circled in red gave some odd readings and were...
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Thanks for the suggestions again: I just finished doing them.



    Pin 1 reads 0.18V and Pin 9 reads 3.38V in both states



    Pictures are attached. I'm not really sure how to measure the button. I took the grounded screw and measured the pins in the plug, which gave me a reading of 0 V.



    Unfortunately he doesn't ship to the Netherlands. There are some Chinese sellers that offer it for $35, but if I can avoid it, I'd rather do it without the new board....
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Ah sorry, I thought selldoor just meant the power board.

    Thanks for your effort so far ...
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    I remeasured the power board and got the same readings as above.

    I hope the pics are clear enough.

    Please note: I made sure no wires or soldering tin is touching any other part. This might be unclear from the photo....
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    When connected, I get nothing I'm afraid. Nothing on the LED and nothing on the screen.
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Just finished replacing those three, but unfortunately nothing happened. Anything else I can still try?
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Thanks for the response

    I remeasured IC601:
    17-33g
    #1 = 0
    #2 = 3.31
    #3 = 5.19

    So I suppose the fault isn't found in this part.

    I replaced four bulging ones and two non bulging ones. I can't tell from the outside of the capacitors which brand they are unfortunately, but when I look at the site of my local electronics store, they only carry Panasonic ones for the type that I bought.

    The ones I replaced are:
    1x 330 uF 25 V 105 C
    6x 820 uF 25 V 105 C
    ...
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  • enigmach
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Hi,
    I stumbled on this page because my 226BW is showing the same problems as the poster. My screen started blinking/flickering as well and wednesday a week ago it finally died. The first thing I did was check the capacitors which were bulging, so I replaced these. Unfortunately, my screen still refused to turn on, not even the LED was blinking, so today I bought myself a multimeter and measured the same points as was asked:

    On the power board :

    1 - on/off = 0.18
    2 - A-Dim = 0.14
    3 - 13.5V = 15.64...
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