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LCD Technica TX22D14BTCDG935 - defecte frecvente

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LCD Technica TX22D14BTCDG935 - defecte frecvente Empty LCD Technica TX22D14BTCDG935 - defecte frecvente

Mesaj Scris de Costin la data de Mier 2 Sept 2015 - 20:51

LCD Technica TX22D14BTCDG935

22" LCD, model X22/14B-GB-TCD-UK, ansamblat pentru Tesco Stories Ltd.

1. 
Defect: porneste la comanda ON (telecomanda sau RC); nu apare backlight.

La o prima inspectie a sursei am observat condensatoare de filtraj umflate. Am verificat toti condensatorii electrolitici din sursa, am refacut lipiturile pleznite la terminalele componentelor care se incazesc si au fost inlocuit condensatorii uscati.

La o noua pornire am sesizat un sfarait in partea superioara a ecranului si am trecut la verificarea lampilor cu un tester CCFL. Asa cum era de asteptat, una din lampile de sus este defecta. 

Remediere
Din cauza lipsei unei lampi compatibile, am inlocuit invertorul original (4 iesiri) cu altul (doua iesiri, o lampa buna de jos si cea defecta de sus raman neconectate). Dupa verificarea conectorului de alimentare si comanda constat ca sunt perfect compatibile, asa ca nu mai este necesara inlocuirea cuplei sau schimbarea ordinii firelor. 
La aceasta diagonala (22") diferenta de iluminare nu este sesizabila.

Recomand sa evitati anularea protectiei invertorului din cauza riscului de incendiu.
 
Noul invertor montat pe sasiu:
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