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bp_pavel

Sursa Nordmande N1403C(uoc top 80pin)

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Buna ziua, am un tv Nordmande N1403C sasiu uoc top 80pin, sursa cu cq0765rt, procesor TDA12122H/N200, audio TDA8944J, baleiaj STV9302B. Problema este ca in momentul cand il pornesc tensiunile sunt la jumatate dupa 2 secunde sunt cum trebuie, 12V, 10V, 24V si 108V timp de 4 secunde, apoi scade la jumate o secunde dupa care revine, face acest lucru de 4 ori dupa care raman la jumate. Schimbat condesatori primar si secundar, decuplat sursa si pus bec pe ramura de B+, masurat diode schimbat optocuplor si TL431 si NIMIC, LA FEL, unde este problema ? Am gasit o schema dar difera, sursa e la fel cu diferenta ca la mine pe placa nu sunt regulatoarele de tensiune din secundar IC852, IC401 si piesele aferente.

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se aprinde becu, dar la fel , tensiuni bune cateva secunde apoi la jumatate, iar bune...si se repeta de 4ori dupa care raman la jumatate

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incearca si schimba diodele primar sursa 1n4148 si alea mai fac figuri pe condu primar sursa de 100mf 450v ce tensiune este

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schimbat diode 1N4148 si la fel face, pe c 100uF/450V am 308V-312V, cand tensiunea este buna in primar am 308V

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