Ok, I have an HP Pavilion Motherboard that is not starting up. The model is DA0R53MB6E1 REV E R53. I got the schematic from HERE. I went through the startup voltage sequence. and I have detected the following.
-- CHARGER CIRCUIT --
19V ok at charger circuit.
pu8 is giving out ACPRES (which if I'm not mistaken is charger voltage connected)
PU8 ACDET I'm getting 2.7v
-- POWER SUPPLY 5VALW/3VALW --
PU7 has 19v VIN
REF 2V
HAVE 19V on drain of PQ50 and PQ53, but no 5V or 3V output
could it be the chip? I don't have oscilloscope to see the lgate/ugate pulse to mosfet, just voltmeter. looking for advise here.
any help appreciated
thanks
-- CHARGER CIRCUIT --
19V ok at charger circuit.
pu8 is giving out ACPRES (which if I'm not mistaken is charger voltage connected)
PU8 ACDET I'm getting 2.7v
-- POWER SUPPLY 5VALW/3VALW --
PU7 has 19v VIN
REF 2V
HAVE 19V on drain of PQ50 and PQ53, but no 5V or 3V output
could it be the chip? I don't have oscilloscope to see the lgate/ugate pulse to mosfet, just voltmeter. looking for advise here.
any help appreciated
thanks
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