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.
-- PU7 POWER SUPPLY --
VIN 19V
VRE5 5V
VRE3 3V
EN0 3.2V
POWERGOOD 0V
ENC 0V (missing enable voltage comes from U16 kbc)
-- KBC U16 --
11 VCC = 1.2 should be 3V According to schematic
121 VPCU = 3.2V
123 RSMRST = 0V
124 ECPWROK = 1.1V
21 ACIN = 3.1V
69 AD_AIR = 2.7V
18 LID_EC = 3.2V
14 WRST = 3.1V
I have doubt as to where the 3V on pin 11 U16 comes from, at this time voltage is only 1.2V. If someone can help appreciated
Thanks
-- CHARGER CIRCUIT --
19V ok at charger circuit.
-- PU7 POWER SUPPLY --
VIN 19V
VRE5 5V
VRE3 3V
EN0 3.2V
POWERGOOD 0V
ENC 0V (missing enable voltage comes from U16 kbc)
-- KBC U16 --
11 VCC = 1.2 should be 3V According to schematic
121 VPCU = 3.2V
123 RSMRST = 0V
124 ECPWROK = 1.1V
21 ACIN = 3.1V
69 AD_AIR = 2.7V
18 LID_EC = 3.2V
14 WRST = 3.1V
I have doubt as to where the 3V on pin 11 U16 comes from, at this time voltage is only 1.2V. If someone can help appreciated
Thanks