Hello all, I have an Asus X552EA-SX091H, with mainboard X550EP Rev 2.0 that will not power up.
Here's what I've checked so far. 19v is present after the first 2 mosfets and current sense resistor, there's 3,3V present in power button and when depressed goes to zero, but nothing happens, Bios chip as no voltage at pin 8 (3v)?.
Checked all inductors and there's not short to ground
At PJ8102 near the buck converter mosfets there's is 19v coming in but nothing coming out of the inductors which should be the 3v and 5v alwais on.
Power Switch regulator UP1589QQKF has 5VAO and 3VAO present on pin 14 and 15
IC Charger BQ735 all values seem ok
Boardview for this mobo is attached
Reminder: rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483
Link to boardview - https://www.badcaps.net/forum/showthread.php?t=120019
.
Here's what I've checked so far. 19v is present after the first 2 mosfets and current sense resistor, there's 3,3V present in power button and when depressed goes to zero, but nothing happens, Bios chip as no voltage at pin 8 (3v)?.
Checked all inductors and there's not short to ground
At PJ8102 near the buck converter mosfets there's is 19v coming in but nothing coming out of the inductors which should be the 3v and 5v alwais on.
Power Switch regulator UP1589QQKF has 5VAO and 3VAO present on pin 14 and 15
IC Charger BQ735 all values seem ok
Boardview for this mobo is attached
Reminder: rules and organization of this section - https://www.badcaps.net/forum/showthread.php?t=117483
Link to boardview - https://www.badcaps.net/forum/showthread.php?t=120019
.