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Yamaha RX-V671 - nu porneste


mircea888
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Salutare!

 

Am un receiver Yamaha RX-V671 care nu porneste, nici in stand-by nu e nimic aprins.

-Sursa de STBY e ok, are 5.5V. 

-Procesorul este alimentat cu 3.3V, verificat regulator IC97. Verificat existenta semnalului de clock de 8MHz de la procesor. Pinul de reset (pin21) este in 1 logic (3.3V).

-Butoanele functioneaza, am verificat tensiunile corespunzatoare apasarii butoanelor pe pinul 171 (KEY1) de la procesor.

-Am facut un reflow cu aer cald si flux la procesor.

-Am incercat secventa de scoatere din protectie prin apasarea butoanelor specificate in service manual la pagina 30.

 

 

Cateodata cand il alimentez cupleaza releul, porneste traful mare si ramane asa, toate tensiunile sunt ok dar nu se aprinde nimic, deci este ceva haotic. Face la fel daca ii dau semnal manual pe pinul PRY (comanda releu).

 

http://elektrotanya.com/yamaha_rxv671.pdf/download.html  - schema corespunde perfect

 

Scheme bloc - pag 91

Schema procesor - pag 130

Schema sursa - pag 142

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Am verificat semnalele ACPWR_DET si CPU_N_RST si par ok. Am verificat si pe optocuplor si era in conductie.

 

Din pacate am dat deja receiverul inapoi proprietarului.

Va multumesc totusi pentru sfat, erau sanse mari ca asta sa fie cauza dar nu am avut noroc de data asta.

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