I have a Lenovo G50-80 motherboard. aclu3/aclu4 UMA NM-A362 REV1.0.
the board is not turning on. no +3VALW, or +5VALW.
the charging IC is BQ24737. there is 20v in pj302 jumper, however. and it goes inside pu904. but PU904 is not providing the +3VALW.
what confuses me is the short between +3VL and the ground at 51 ohm. i tried very hard to find the cause with no luck.
i have two main question:
1- the pu904 ic should receive the EN signal from the IO. but it does not receive any. can i know what is the main power for the IO ic. because it seems that the ic is not receiving any power signals?
2-i have removed the IO ic from the board now. but still the is a short between the +3VL and the ground at 51 ohm. any suggestion is appreciated so much.
please help?
and thanks in advance
the board is not turning on. no +3VALW, or +5VALW.
the charging IC is BQ24737. there is 20v in pj302 jumper, however. and it goes inside pu904. but PU904 is not providing the +3VALW.
what confuses me is the short between +3VL and the ground at 51 ohm. i tried very hard to find the cause with no luck.
i have two main question:
1- the pu904 ic should receive the EN signal from the IO. but it does not receive any. can i know what is the main power for the IO ic. because it seems that the ic is not receiving any power signals?
2-i have removed the IO ic from the board now. but still the is a short between the +3VL and the ground at 51 ohm. any suggestion is appreciated so much.
please help?
and thanks in advance
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