<html><body><div>Nějaká zajímavá hra, že by se kondenzátor při prvním měření nabil na nějaké stejnosměrné napětí a při druhém ho zase vracel? Třeba mezi měřeníma kondenzátor vyzkratovat?</div><div><br></div><aside>---------- Původní e-mail ----------<br>Od: Michal Grunt <michal.grunt@gmail.com><br>Komu: HW-news <hw-list@list.hw.cz><br>Datum: 12. 6. 2024 15:52:51<br>Předmět: Re: Jak najít zkrat?</aside><br><blockquote data-email="michal.grunt@gmail.com"><div dir="auto">Tak jsem si to pořídil, sestavil a desku notebooku tím projel. Zajímavé je, že u pár kondenzátorů mi to ukazuje od cca 5 do 7 ohm. Ale když prohodim hroty tak to neukáže nic. Úplný zkrat "na obě strany" nějak nemohu najít. Jediné co jsem našel je tranzistor primo pod CPU s označením "t1A" a ten je ve zkratu mezi B a C a je ještě ještě otázka jak je zapojeny. Ale to, že kondenzátory (nektere) oproti zemi ukazují jednotky ohm a když prohodim hroty tak to neukazuje nic mě překvapilo.<div dir="auto"><br></div><div dir="auto">Když volný konec přiložim na zem a "tuzkou" měřím tak na jednom vývodu kondenzátoru namerim cca 0 a na druhém jednotky ohm.</div><div dir="auto"><br></div><div dir="auto">Když hroty měřidla obrátím (tužku na zem a volným koncem merim) tak je na kondenzátoru na jednom vývodu 0 a na druhém nenamerim nic.</div><div dir="auto"><br></div><div dir="auto">Ale děje se tak jenom na určitých kouscích (hnizdech) kondenzátoru. Na opačném konci desky se tak neděje.</div></div><br><div class="-wm-gmail_quote"><div dir="ltr" class="-wm-gmail_attr">Dne út 4. 6. 2024 10:31 uživatel Peter Berec <<a href="mailto:pberki@gmail.com">pberki@gmail.com</a>> napsal:<br></div><blockquote class="-wm-gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px#ccc solid;padding-left:1ex"><u></u>

  
    
  
  <div>
    <p>Konštrukcia z <font face="Times New Roman, Times, serif">PE AR
        03/2023:</font></p>
    <p><font face="Times New Roman, Times, serif"><a href="https://www.laskakit.cz/stavebnice-vyhledavace-zkratu/" rel="noreferrer">https://www.laskakit.cz/stavebnice-vyhledavace-zkratu/</a></font></p>
    <p><font face="Times New Roman, Times, serif">Peter<br>
      </font></p>
    <div>Dňa 3. 6. 2024 o 11:59 Michal Grunt
      napísal(a):<br>
    </div>
    <blockquote>
      
      <div dir="auto">Ještě jsem se postupně ze článku v AR/PE proklikal
        sem. To už se z toho co mam v šuplíku postavit dá a asi to
        vyzkouším.
        <div dir="auto">
          <div dir="auto"><br>
          </div>
          <div dir="auto"><a href="https://www.eevblog.com/forum/testgear/finding-short-on-motherboards-with-a-shorty-(with-display)/" rel="noreferrer">https://www.eevblog.com/forum/testgear/finding-short-on-motherboards-with-a-shorty-(with-display)/</a></div>
        </div>
      </div>
      <br>
      <div class="-wm-gmail_quote">
        <div dir="ltr" class="-wm-gmail_attr">Dne po 3. 6. 2024 9:13
          uživatel Michal Grunt <<a href="mailto:michal.grunt@gmail.com" rel="noreferrer">michal.grunt@gmail.com</a>>
          napsal:<br>
        </div>
        <blockquote class="-wm-gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px#ccc solid;padding-left:1ex">
          <div dir="auto">Děkuji za tip. Vypadá to zajímavě. Myslím, že
            mám už dost metod na vyhledávání tak je postupně (od té
            nejdostupnější) vyzkouším. Děkuji.</div>
          <br>
          <div class="-wm-gmail_quote">
            <div dir="ltr" class="-wm-gmail_attr">Dne ne 2. 6. 2024 10:55
              uživatel Z.Kobylka <<a href="mailto:zdeko@seznam.cz" rel="noreferrer noreferrer">zdeko@seznam.cz</a>>
              napsal:<br>
            </div>
            <blockquote class="-wm-gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px#ccc solid;padding-left:1ex">
              <div>
                <p><font face="Times New Roman, Times, serif">Co
                    "Kkapesní vyhledávač zkratu" PE AR 03/2023 str 11
                    rozlišení 0,1mohmů v rozsahu 0-3,5Ohmů</font></p>
                <p><font face="Times New Roman, Times, serif">Kobylka<br>
                  </font></p>
                <div>Dne 01.06.2024 v 8:31 Michal Grunt napsal(a):<br>
                </div>
                <blockquote>
                  <div dir="auto">Děkuji, vyzkouším.</div>
                  <br>
                  <div class="-wm-gmail_quote">
                    <div dir="ltr" class="-wm-gmail_attr">Dne pá 31. 5. 2024
                      14:14 uživatel Nesvacil Jiri <<a href="mailto:nesvacil@posys.eu" rel="noreferrer noreferrer noreferrer">nesvacil@posys.eu</a>>
                      napsal:<br>
                    </div>
                    <blockquote class="-wm-gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px#ccc solid;padding-left:1ex">
                      <div>
                        <p>Díval jsem se a je to spíš toto <a href="http://www.belza.cz/simple/pisk.htm" rel="noreferrer noreferrer noreferrer noreferrer">http://www.belza.cz/simple/pisk.htm</a>
                          čím zkouším.</p>
                        <p>Jirka</p>
                        <div>Dne 30.05.2024 v 14:00 Michal Grunt
                          napsal(a):<br>
                        </div>
                        <blockquote>
                          <div dir="ltr">Možná spíš toto? Strana 5.
                            <div><br>
                            </div>
                            <div><a href="https://www.ok1khl.com/storage/mladez/Soubor_stavebnich_navodu_pro_krouzky.pdf" rel="noreferrer noreferrer noreferrer noreferrer">https://www.ok1khl.com/storage/mladez/Soubor_stavebnich_navodu_pro_krouzky.pdf</a><br>
                            </div>
                          </div>
                          <br>
                          <div class="-wm-gmail_quote">
                            <div dir="ltr" class="-wm-gmail_attr">čt 30. 5.
                              2024 v 13:37 odesílatel Michal Grunt <<a href="mailto:michal.grunt@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer">michal.grunt@gmail.com</a>>
                              napsal:<br>
                            </div>
                            <blockquote class="-wm-gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                              <div dir="auto">Není to něco takového?
                                <div dir="auto"><br>
                                </div>
                                <div dir="auto"><a href="https://www.high-voltage-lab.com/202/continuity-tester" rel="noreferrer noreferrer noreferrer noreferrer">https://www.high-voltage-lab.com/202/continuity-tester</a></div>
                                <div dir="auto"><br>
                                </div>
                                <div dir="auto">Nebo</div>
                                <div dir="auto"><br>
                                </div>
                                <div dir="auto"><a href="https://www.eeweb.com/continuity-tester-circuit-diagram/" rel="noreferrer noreferrer noreferrer noreferrer">https://www.eeweb.com/continuity-tester-circuit-diagram/</a></div>
                              </div>
                              <br>
                              <div class="-wm-gmail_quote">
                                <div dir="ltr" class="-wm-gmail_attr">Dne čt
                                  30. 5. 2024 7:55 uživatel Nesvacil
                                  Jiri <<a href="mailto:nesvacil@posys.eu" rel="noreferrer noreferrer noreferrer noreferrer">nesvacil@posys.eu</a>>
                                  napsal:<br>
                                </div>
                                <blockquote class="-wm-gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                  <div>
                                    <p>Na zjištění zkratu používám
                                      multivibrátor, někde v AR bylo
                                      schéma na vstupu to má ochranné
                                      diody tj. malé napětí, hlavně
                                      slyším vybíjení kondenzátorů či
                                      zkrat. Měřidlem si nedokáži úplně
                                      představit. Menší kapacity se tím
                                      poznají hůře či menší odpory, ale
                                      oproti měření ohmetrem.... . Někde
                                      vyšel taky c-beeper, ale tady
                                      zrovna nepoužívám a nevím zda tady
                                      by byl ideální.</p>
                                    <p>Jirka<br>
                                    </p>
                                    <div>Dne 30.05.2024 v 7:10 Michal
                                      Grunt napsal(a):<br>
                                    </div>
                                    <blockquote>
                                      <div dir="auto">Jaké proudove
                                        omezeni máte nastaveno? Děkuji.</div>
                                      <br>
                                      <div class="-wm-gmail_quote">
                                        <div dir="ltr" class="-wm-gmail_attr">Dne st 29.
                                          5. 2024 22:04 uživatel Jan
                                          Kuba <<a href="mailto:honza.kuba@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer noreferrer">honza.kuba@gmail.com</a>> napsal:<br>
                                        </div>
                                        <blockquote class="-wm-gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                          <div dir="ltr">Já hledám tak,
                                            že tam připojím třeba 1V a
                                            měřím napětí v jednotlivých
                                            částech napájecí sběrnice.
                                            Při větším proudu ( je třeba
                                            omezení I) 
                                            <div>už je poznat třeba
                                              prstem nebo  termokamerou,
                                              který kond je ve zkratu...</div>
                                          </div>
                                          <div id="-wm-m_-5913878563540055825m_-2108181517949374487m_1688072955432965373m_-9080113161777530748m_-4867192474044427739m_-3512490688857473190m_-3540294172163703170DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
                                            <table style="border-top:1px solid rgb(211,212,222)">
                                              <tbody>
                                                <tr>
                                                  <td style="width:55px;padding-top:13px"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" rel="noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer"><img src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" alt style="width:46px;height:29px" width="46" height="29"></a></td>
                                                  <td style="width:470px;padding-top:12px;color:rgb(65,66,78);font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Neobsahuje
                                                    žádné viry.<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:rgb(68,83,234)" rel="noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer">www.avast.com</a></td>
                                                </tr>
                                              </tbody>
                                            </table>
                                          </div>
                                          <br>
                                          <div class="-wm-gmail_quote">
                                            <div dir="ltr" class="-wm-gmail_attr">st 29.
                                              5. 2024 v 21:54 odesílatel
                                              Michal Grunt <<a href="mailto:michal.grunt@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer">michal.grunt@gmail.com</a>> napsal:<br>
                                            </div>
                                            <blockquote class="-wm-gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                              <div dir="auto">Mám tu
                                                jeden notebook, který se
                                                chová tak, že po
                                                zmacknuti tlacitka pro
                                                zapnutí se na 1-5 vteřin
                                                zapne a ihned vypne. Po
                                                vyzkoušení takoveho toho
                                                bezne uzivatelsky
                                                mozneho (jina pamet
                                                atd.) jsem vyndal desku.
                                                Vypadá to, že je ve
                                                zkratu část za menici
                                                napětí, které napájí
                                                CPU.
                                                <div dir="auto"><br>
                                                </div>
                                                <div dir="auto">Předpokládejme,
                                                  že je na vine nějaký z
                                                  kondenzátoru. Desku
                                                  jsem prohlédl pod
                                                  mikroskopem a žádnou
                                                  destrukci něčeho jsem
                                                  nenašel. Ani žádný
                                                  náznak.
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">Kondenzátory
                                                    pod CPU a část
                                                    kondenzátoru za
                                                    menici jsou ve
                                                    zkratu. Před menici
                                                    jsou v pořádku
                                                    (mysleno tak, ze
                                                    napajeci konektor ve
                                                    zkratu neni). Na
                                                    desce je měničů
                                                    více, ale postižené
                                                    jsou ty v uctite
                                                    části desky.
                                                    Dohromady asi 40
                                                    kondenzatoru plus ty
                                                    pod CPU.</div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">Jak v
                                                    nich najít ten
                                                    problémový? Osahat
                                                    jsem to DM v režimu
                                                    ohmetr a v určitě
                                                    části jsem nameril
                                                    minimální odpor. Ale
                                                    i tak jde o dost
                                                    kusů kondenzátoru.
                                                    Pak tu mám ještě
                                                    tuto konstrukci</div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto"><a href="http://mcu.cz/news.php?extend.1242.3" rel="noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer">http://mcu.cz/news.php?extend.1242.3</a></div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">která
                                                    meri miliohmy, ale s
                                                    tím jsem toho take
                                                    moc nenašel nebo s
                                                    tím v tomto režimu
                                                    neumí... Viděl jsem
                                                    videa jak s tím
                                                    autor zkraty hledá
                                                    či blíže lokalizuje,
                                                    ale nějak se nedaří.</div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">Snad
                                                    tam "injektovat"
                                                    napětí postupne na
                                                    ruzna mista a měřit
                                                    odběr?</div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">Děkuji</div>
                                                  <div dir="auto"><br>
                                                  </div>
                                                  <div dir="auto">MG</div>
                                                </div>
                                              </div>
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