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Forum Elektroniczne • Problem z TV Philips
Strona 1 z 1

Problem z TV Philips

: sob 02 cze 2007, 13:32
autor: rgs007
Proszę o pomoc co może być powodem tego, iż podczas oglądania TV w Górnej części ekranu widoczne jest kilka poziomych, białych, cienkich pasków. Jest to ok 5cm od górnej krawędzi ekranu. Na ciemnym tle paski są praktycznie niewidoczne.

: sob 02 cze 2007, 14:46
autor: movzx
Chyba trzeba będzie wielkimi literami napisać instrukcję - żeby pisać jakiego modelu dotyczy problem. Dla własnego dobra - można wtedy napisać np. oznaczenie elementu na płycie, żeby nie szukać.
Niedawno miałem podobne zniekształcenia obrazu w samsungu - pomogła wymiana elektrolitu (47uF) w obwodzie sterowania tranzystora linii.
Pozdr.

Philips

: sob 02 cze 2007, 18:26
autor: PI
Witam; czy te linie występują od samej góry, czy potem, w kierunku środka ekranu zanikają, czy sa one dokładnie poziome, czy lekko ukośne, czy ich grubośc odpowiada mniej-więcej grubości linii TV, czy są wyraźnie grubsze, czy stało sie to nagle, czy postepowało powoli. Czy ostatnio ktoś naprawiał ten TV lub przeprowadzał jakies regulacje? Jaki jest mniej- wiecej wiek tego TV?
PI

Odp

: sob 02 cze 2007, 20:21
autor: rgs007
Telewizor to model 21PT1653/58P. Linie powstały nagle są bardzo cienkie i zaczynają się od początku górnej krawędzi jest ich ok 6 i kończą się mniej więcej 5 cm od górnej krawędzi.

Odp

: sob 02 cze 2007, 20:22
autor: rgs007
Linie są idealnie poziome

Philips

: sob 02 cze 2007, 23:38
autor: PI
Witam; sądziłem, że moga być widoczne linie powrotów; pojawiaja sie one przy niewłasciwych napięciach zasilajacych kineskop (Ug2) lub przy znacznym przesterowaniu kineskopu. Opis może wskazywac na inną usterkę; może ona byc trudna do zdignozowania. Wg opisu może to polegac na cyklicznym wygaszaniu treści obrazu poszczególnych linni w początkowej fazie wybierania obrazu. Trudno powiedzieć, gdzie powstają zakłócenia; może to byc wina jakiejś subtelnej usterki w układzie odchylania poziomego, która z kolei może powodowac - na pewnym etapie procesu - zniekształcenia impulsu SSC. W takim wypadku ( z wykluczeniem bezwzglednie pojawiania sie powrotów) niezbedny wydaje sie oscyloskop i dokładne sprawdzenie przebiegów w układach synchronizacji oraz szczególne przyjrzenie sie impulsowi SSC. Nawet niewielkie zniekształcenia tego impulsu powoduja często bardzo dziwne zachowania OTVC. Nie mozna wykluczyc tu jakiegos specyficznego uszkodzenia w TDA8362 lub w jego aplikacji. Jest to tzw. kombajn, bo ulokowane są w nim wszystkie w zasadzie układy odbiornika; jest ponadto zwiazany w zakresie układów synchro sprzężeniami zwrotnymi z układami wykonawczymi V-def i H-def, przez co usterki, nawet drobne w tych układach przenoszą sie na całośc działania odbiornika, w tym także na kształtowanie impulsu SSC, którego znaczenie, jak podkreslałem, jest kluczowe.
To tyle, dośc ogólnie.... byc może ktos miał taki sam przypadek i taki "tips" w prosty sposób rozwiąże problem.
PI

: pn 04 cze 2007, 11:41
autor: Lukalago
Na początek wymień elektrolity w zasilaniu a później działaj dalej jezeli nie pomoże.

Re: Problem z TV Philips

: czw 07 cze 2007, 10:46
autor: Lutekl

: czw 07 cze 2007, 14:55
autor: movzx