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nings
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Last Activity: 07-29-2022, 08:12 AM
Joined: 04-30-2010
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  • nings
    replied to Mackie CR4 monitors
    in Troubleshooting Audio Equipment
    Re: Mackie CR4 monitors

    Just two new pictures if can help someone other with the rear side


    D1 => Added a second diode for reduce a little heat because already view one D1 diode burned
    C80,C81,C74,C37,C38,C39 => these capacitors have high ESR so replace all just for be safe


    Sorry, I didn't take pictures afterwards but I had to make a hole in the radiator to put a screw and then add thermal paste to make contact with LM and the radiator.


    The temperature has gone down and no more problems since ...
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  • nings
    replied to Mackie CR4 monitors
    in Troubleshooting Audio Equipment
    Re: Mackie CR4 monitors

    Thank you UserXP

    Same HP and same problem but not opened for the moment probably burned too.. never understand manufacturer to put noname cap and design bad pcb we should use 24/24h 7/7d just for return under warranty each time

    Are you happy about the result ? No more heat ?

    What about Z2 (?) the diode you removed here [URL="https://www.badcaps.net/forum/showpost.php?p=904052&postcount=17"]https://www.badcaps.net/forum/showpost.php?p=904052&postcount=17[/URL]
    I view this diode exploded...
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    Last edited by nings; 05-25-2020, 12:47 PM.

    Leave a comment:

  • nings
    replied to Solar panel - circuit for recharge battery during the night
    in General Electronics Technical Discussion
    Re: Solar panel - circuit for recharge battery during the night

    Thank you keeney !
    You have great ideas

    I think to use two relays for connect the power supply to AC.
    One connected to a light detector for security and the second connected to the load of the controller.
    Load is cutted off when the batteries are lower than 2x.0V so I can connect the power supply to AC and put the power to the solar panel input directly like that a charger controller isn't needed. I have already one diode on the positive wire and one in the other side on the negative...
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  • nings
    replied to Solar panel - circuit for recharge battery during the night
    in General Electronics Technical Discussion
    Re: Solar panel - circuit for recharge battery during the night

    Hello,

    I have already a controller for charge the batteries but these devices doesn't support external power.

    But thank you
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  • nings
    started a topic Solar panel - circuit for recharge battery during the night
    in General Electronics Technical Discussion

    Solar panel - circuit for recharge battery during the night

    Hello,

    I have a problem with my solar panel during winter.
    The sun is hidden during almost all the day and it's not enough for recharge completely my batteries about 2 months per year. I recharge manually the batteries during evening but it's not very practical.

    I search a way for recharge the batteries with a power supply only during the night (no power coming from solar panel) for not have two power sources in the same time and only when the battery level is low. The must is a relay who can cut the power going to the power supply when it's not necessary....
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  • nings
    replied to DVB Tuner
    in Troubleshooting TVs and Video Sources
    Re: DVB Tuner

    Thank you for your reply
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  • nings
    started a topic DVB Tuner
    in Troubleshooting TVs and Video Sources

    DVB Tuner

    Hello,

    I have a question about a DVB-C tuner who suddenly stop receive channels.
    Working very well but now I can't found any channels when I scan all frequencies.
    It's not a problem with signal or cable because an another tuner work perfectly.

    Do you know what components I should check and if it's repairable ?
    I found really few documentations about that issue and all people change the tuner without try to repair

    Philips SAA7146
    Demodulator : TDA10023
    Tuner : CU1216L


    Thank you for your he...
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  • nings
    replied to Problem with DM7025 Power Supply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Problem with DM7025 Power Supply

    It's probably not resistor because are in //

    I have change another capacitor without any change
    Nobody can help me ? And try to give me a solution for check the power supply ?

    How it's possible to measure this power supply ?
    Some parts are AC and other DC and change the result

    I have +230V on one side and -104V on the other side ... The radiator is at -104V and the other 0. I really doesn't understand how this result can be right.

    And I have -104V on the majority of the...
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  • nings
    replied to Problem with DM7025 Power Supply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Problem with DM7025 Power Supply

    It's possible thats the problem can come from somes resistors ?

    I have found a lot of errors from the colour code or smd number...
    0.6Mohm instead of 1Mohm, 270kohm instead of 470kohm...

    I have found one other with 1.2ohm and from colour code should be 15ohm ..
    But when a resistor burn, should be have an unlimited ohm value and not decrease his resistance no ?
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  • nings
    replied to Problem with DM7025 Power Supply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Problem with DM7025 Power Supply



    The first problem : LCD backlight start but with nothing on it and have some volts on the molex cable. may be 1V on 5V and 3V on 12V.

    After my shortcut, LCD doesn't start anymore and I have no power on molex 0.01V (probably the multimeter which it's not really accurate)

    And I doesn't found a way for start manually the power supply without plug to the Dreambox and doesn't know if start or not... No way for check




    Not ... I have found something like that for...
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  • nings
    replied to Problem with DM7025 Power Supply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Problem with DM7025 Power Supply

    OK

    It's for not overload forum DB
    Yes I know that picture doesn't stay a lot of time.

    But no problem, I can upload on the forum DB directly.


    Yes but buy another is too much expensive
    It's probably a little thing which have burn but don't know what ... And if it's the power supply or the mainboard...
    I try to look the mainboard today if I see something which have burn.

    But I don't think because I have the metal part in the hand when the power supply...
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  • nings
    started a topic Problem with DM7025 Power Supply
    in Troubleshooting Power Supplies and Power Supply Design

    Problem with DM7025 Power Supply

    Hello,

    I have take a lot of time on this power supply but I'm lost

    I have try to repair this power supply but during a test, I have removed power and move the power supply but when moving I have shortcut 2 components create a sound like "clac" and now seem totally death

    Before the backlight was ON now all stay OFF

    Some screens about the power supply :

    [URL="http://*************/photo/my-images/689/part1l.jpg/"]http://*************/photo/my-images/689/part1l.jpg/[/URL]
    [URL="http://*************/photo/my-images/849/part2z.jpg/"]http://*************/photo/my-images/849/part2z.jpg/[/URL]...
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  • nings
    started a topic Electric noise on a HP 1955
    in Troubleshooting Computer Displays

    Electric noise on a HP 1955

    Hello,

    Sorry for this thread but I don't have founded any informations on all other thread concerning these type of monitors

    My first problem was the monitor shutdown after some minutes. Repaired by resolder all transformers/transistors/fuse.

    But now I have always a noise when I turn ON this monitor and stop after 1-2sec when backlight is ON and have a permanent little noise like a bzzzz.
    Someone can help me to solve this problem or it's normal on these monitors ?
    (Don't have use this monitor before have this problem.)

    ...
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