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ehrja
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Last Activity: 12-06-2019, 09:39 AM
Joined: 03-26-2016
Location: Tampico
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  • ehrja
    replied to Acer AL1717A
    in Troubleshooting Computer Displays
    Re: Acer AL1717A

    OK I got it, actualy I remember a tutorial to bypass the security circuit adding tree big resistors in series to dummy load the lamp I do not remember the details.

    Fortunately I got an old monitor that is also bad but the LCD was ok same brand and size and also is compatible with the lamps and the video buss so I just change it, the monitor was working fine for about 30 minutes or so, actually the quality of the image was better, tomorrow I'll test it again a few hours.
    and post a picture
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  • ehrja
    replied to Acer AL1717A
    in Troubleshooting Computer Displays
    Re: Acer AL1717A

    Hello I test already the 4 lamps in the monitor they are in groups of 2 wraped with shrink tube. 3 of them toun on White light, just one is blinking red dark color like a mini storm, is obvious that this one is damaged and I wonder if is possible to use only 3 of them and just leave the bad one disconnected?
    Could that damage other components like the inverter or the other lamp that is aside the bad one?
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  • ehrja
    replied to Samsung 740N power problem
    in Troubleshooting Computer Displays
    Re: Samsung 740N power problem

    Did you check if there is any voltage in the white conector?
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  • ehrja
    replied to Acer AL1717A
    in Troubleshooting Computer Displays
    Re: Acer AL1717A

    Yes I do have one spread, I'll test one by one and check what is going on, I also have a cfl lamp tester I'll chech the lamps in the lcd also.
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  • ehrja
    started a topic Acer AL1717A
    in Troubleshooting Computer Displays

    Acer AL1717A

    Acer AL1717A

    This monitor was working great, it was working continually 8hrs at the office but now is having troubles the problem seems to be the back light.

    I do a control test and notice that when I turn on the monitor it does well but at the minute it seems to shutdown I also notice that the status leed still on and green. Using a torch lamp I can see the windows environment and I thought that it can be a bad cap, to be easy and because in that moment I don't have my cap ESR meter I change all the caps because they looks flat, no evidence of physical bad caps.
    ...
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    Last edited by ehrja; 08-08-2016, 04:42 PM.
  • ehrja
    replied to V7 r19wps no backlight - cfl lights
    in Troubleshooting Computer Displays
    Re: V7 r19wps no backlight - cfl lights

    post pictures.
    I purchase a cfl lamp tester for monitor repair work, just for be sure which the is problem, I din't received it yet but I'll tell.
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  • ehrja
    replied to Benq et-0004-L problems with one side of the inverter
    in Troubleshooting Computer Displays
    Re: Benq et-0004-L problems with one side of the inverter



    I wanted to add that all leads in the 8pin chip that is nearest in the picture has -35v...
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  • ehrja
    replied to Benq et-0004-L problems with one side of the inverter
    in Troubleshooting Computer Displays
    Re: Benq et-0004-L problems with one side of the inverter



    I guess that is the reflection of the flash light and I already isolate the wire with termofilm....
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  • ehrja
    started a topic Benq et-0004-L problems with one side of the inverter
    in Troubleshooting Computer Displays

    Benq et-0004-L problems with one side of the inverter

    Problem with inverter section. It powers and displays the image just a couple of seconds then it gets off.

    Only the inferior lamp is working.
    The image can be seen with an external light.

    When is on is doing a noise and smells bad, I notice a hole in the cable of a ccfl lamp and the noise seems to be originated from that hole which is barely touching the metal case an can be sen plasma between the cable and the metal.

    I try with other ccfl lamp but it not power....
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  • ehrja
    started a topic Ondey is ON an the other do not power on
    in Troubleshooting TVs and Video Sources

    Ondey is ON an the other do not power on

    This monitor a branded benq.

    Acts like is powering on but never powers only when I hit it, I already change a bad cap but only was good one day.

    Any idea on why is happening this?

    I'm resoldering some pads that looks kinda cracked hope that resolve the problem.
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  • ehrja
    replied to Repair a custom form atx posee suply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Repair a custom form atx posee suply



    is not it has a big black crack in the hidden side.

    however I notice that all semiconductors in the secondary side are shorted beter no to follow with this one.

    And I better check on the other PS, is the same model the problem almost the same just the 5vsb are on and when I pluged the atx tester all voltages are on for about half a second....
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  • ehrja
    replied to Repair a custom form atx posee suply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Repair a custom form atx posee suply



    I'm actually wondering if at last this power supply could be changed by a generic if not can be saved.

    I mean this power supply has the same voltages and connectors as a generic one. Just to find the way to Short the height of the tallest components that must be the heatsinks.

    I read an article that talk something about feeding the output whit an other power supply in order to check the secondary section or the regulated low voltage. Is it posible to do without damaged components?...
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    Last edited by ehrja; 03-27-2016, 09:30 PM.

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  • ehrja
    replied to Repair a custom form atx posee suply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Repair a custom form atx posee suply

    This big cap is good it reads 105 uf ESR 0.26, I'm not shure about the big resistor which reads 0.4 hom
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  • ehrja
    replied to Repair a custom form atx posee suply
    in Troubleshooting Power Supplies and Power Supply Design
    Re: Repair a custom form atx posee suply

    Ok I'll checo that luky I have other power suply wich has diodes burned.

    That is true all the pins un the MOSFET was ushorted an obiously the controlar board of the MOSFETs must be damaged I'll check that

    Thank you for your answer.
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  • ehrja
    started a topic Repair a custom form atx posee suply
    in Troubleshooting Power Supplies and Power Supply Design

    Repair a custom form atx posee suply

    Hello Im trying of repair a customized form factor atx poder suply wich is from a DVR the model of this power suply is ENP-2320 and is really crowded in electrónica an also is really small

    The síntomas: fuse blown I already take out a MOSFET k2611 from toshiba wich was un short circuit but only the 5vsb is feeding

    I'll try to find the problem

    Sorry forma the por inglish Im wrigthing from muy new celphone.

    Hope someone can helpme to find the problems if I can't...
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  • ehrja
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hello
    My name is Emmanuel Hernandez and I'm from Mexico

    I work in the systems area of a corporation and usually they look after me to fix some devices.
    so is nice to find a forum of all about fixing electronics.

    regards.
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