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LCD TV and Monitor basic troubleshooting guides

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  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Originally posted by sacrh View Post
    Needed scahematics diagram for all circuit boards for: TV SONY KDL-52ex700
    This thread is for learning and for reference material, see the post you made for that TV you are trying to fix. Posting same request in more than one thread causes problem.

    Leave a comment:


  • sacrh
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Needed scahematics diagram for all circuit boards for: TV SONY KDL-52ex700

    Leave a comment:


  • thoma
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    http://televid-sib.ru/index.php?topic=42098.0

    Power Supply Samsung BN44-00632A BN44-00633A schematic

    Registration required!

    Leave a comment:


  • rodanny
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Originally posted by budm View Post
    More Learning info.
    10x
    Good job....

    Leave a comment:


  • rodanny
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Originally posted by budm View Post
    This is SONY training manual for the T-CON.
    Exxcelent...10X

    Leave a comment:


  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    FAQ ceramic caps: Capacitance and Applied Voltage
    https://cdn.badcaps-static.com/pdfs/...1cafebd52c.pdf
    http://www.murata.com/en-us/support/...mlcc/char/0005

    https://ec.kemet.com/ceramic-capacit...tage-ask-fae-1
    https://www.maximintegrated.com/en/a...ex.mvp/id/5527
    Attached Files

    Leave a comment:


  • caseyniam3
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Hi to all I am new here and have a question. I own a Sony KDL-60-EX500 one day the TV went out it has a black screen but I do have full backlighting and sound just no picture.I also notice the front panel blinks 5 times. My question is should I replace the T-con board or the Main board what are the odds of either boards fixing the problem? When I power TV on it shown Sony logo and startup sound then screen gets dark but I do have full backlighting any help is appreciated thank you all.

    Leave a comment:


  • thoma
    replied
    Re: LCD TV and Monitor basic troubleshooting guides



    TRAINING SAMSUNG ES EH SERIE

    WAIT UNTIL GET MANUAL APPEARS

    Leave a comment:


  • thoma
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    http://reflektor.kz/articles.php?article_id=45

    LED - Hintergrundbeleuchtung Treiber

    (Ersatz von CCFL - Lampen auf LED)

    Leave a comment:


  • thoma
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    http://reflektor.kz/articles.php?article_id=39

    http://reflektor.kz/articles.php?article_id=42

    EDGE LED DIRECT LED

    Leave a comment:


  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Power supply info. WE-ONLINE
    http://www.we-online.com/web/en/pass...tion_45887.php

    Leave a comment:


  • thoma
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    SAMSUNG EH UND F SERIE no Backlight

    [url]https://www.youtube.com/watch?v=KHBdZqGhMTg[/url

    http://www.berlin-repariert.de/samsung-qualitaet-ue32f6270-kein-bild/

    LED Driver IC slc1012c on backside smps often defect!
    Last edited by thoma; 08-03-2017, 05:16 AM.

    Leave a comment:


  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Sharp TV training manual:
    Attached Files

    Leave a comment:


  • sachin03323
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Can somebody tell me what is the use of STV CKV CPV signals on TCON strip.

    What voltges will i get for them with mutimeter & what waveform will i get with DSO

    Leave a comment:


  • skafiskafnjak
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    OK i spent some time and discovered the following.

    Bad cap C131 had value of 39uF and ESR of 2ohm. It should be 47uF and 70mOhm. So ESR was way higher than needed.

    C102 was OK with capacitory, however, ESR was 0.173ohm. I replaced it anyway.

    Since I did not have tantalum capacitor and could not keep TV open I had to fix it right away. I used 39uF 100V ChemiCon capacitors, 3 of them in parallel so I got ESR exactly 0.070ohm while capacitance was around 120uF.
    These caps were replacement ones for the old projection TV, chassis RCT CTC169 (power supply).

    One note I wanted to add is that Fluke 28 measured 52uF for defective cap so this means that we should not rely our decitions based on capacitance value measured by regular DMM.
    Also Sencore LC103 is outdated for these new stuff, it measures as low as 0.01ohm and its test leads as well as relays inside, which become old, are not reliable way to measure such a low ESR.

    Here are few pictures to share..
    Attached Files
    Last edited by skafiskafnjak; 07-09-2017, 01:01 PM.

    Leave a comment:


  • skafiskafnjak
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    WHat if I use 5x 10uF electrolytic in parallel?

    Leave a comment:


  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    They used 47uf 10V SMD Solid Tantalum cap which has low ESR and also does not dry out and deteriorate with times like typical lytics cap, it also smaller than lytics cap with the same value.
    Some info:
    https://cdn.badcaps-static.com/pdfs/...dea5e3c0ff.pdf
    https://cdn.badcaps-static.com/pdfs/...ee7d39a774.pdf
    https://cdn.badcaps-static.com/pdfs/...63aae3b97e.pdf
    Attached Files
    Last edited by budm; 07-08-2017, 10:39 PM.

    Leave a comment:


  • skafiskafnjak
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Originally posted by budm View Post
    Samsung LNXXA550P3 series with bad caps on the main board, TV makes squealing static sound through speakers, cycle on and off, etc.
    Temporary solder in 100uF 10V low ESR cap in parallel with C102 to see if it solves the problem, but make sure the power supply caps are OK first.
    KEMET Polymer Tantalum caps can be used.
    Why regular electrolytic capacitor with low ESR wont work/last here?

    Leave a comment:


  • Selvaraj
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    Thank you so for the info very useful

    Leave a comment:


  • budm
    replied
    Re: LCD TV and Monitor basic troubleshooting guides

    LED Backlights info.
    http://alpengeist-tvrepair.blogspot....ces-tools.html

    Leave a comment:

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