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resolvido Lenovo Ideapad 310 MB NM-A752 +LEDVDD inestable
jolinpc postou um tópico em Casos resolvidos - Notebooks
Hola a tod@s Tengo por aca un Lenovo Idepad 310-15isk con placa NM-A752, el cual inicialmente venia que no respondía a encendido y V20B+ estaba ausente. Se ha cambiado PQ312 que estaba en corto. Según esquema corresponde un AON7408L pero soldado en placa venía un V1548. Finalmente, ha sido sustituido por un AON7410. Ahora ya tengo V20B+ presente, siempre y cuando la pantalla este desconectada. Si conecto la pantalla interna, el voltaje de la linea V20B+ se vuelve muy inestable y no sube de 4V. He probado otra pantalla y hace exactamente lo mismo. Si la quito, tengo 20V estable y el equipo enciende. Si la conecto, cae a 2-4V muy inestables y el equipo no responde al encendido lógicamente. He comprobado si hay algún corto en alguna otra linea del conector JEDP1, con la pantalla conectada y todo parece OK. Alguna sugerencia? ................ Hello everyone I have here a Lenovo Idepad 310-15isk with NM-A752 board, which initially came that did not respond to ignition and V20B + was absent. PQ312 that was short has been changed. According to the diagram, an AON7408L corresponds but a V1548 was welded on the plate. Finally, it has been replaced by an AON7410. Now I have V20B + present, as long as the screen is disconnected. If I connect the internal screen, the voltage of the V20B + line becomes very unstable and does not rise above 4V. I have tried another display and it does the exact same thing. If I remove it, I have a stable 20V and the equipment turns on. If I connect it, it falls to 2-4V very unstable and the equipment does not respond to the ignition logically. I have checked if there is a short in any other line of the JEDP1 connector, with the screen connected and everything seems OK. Any suggestion?
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