Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
[QUOTE=BlueMidnight;977977]Let's check the AC adapter. I think I mentioned this early in the thread, but I'll say it again. Plug it in and measure between ground on outside of the barrel and positive on the inside of barrel. It's okay to touch the center pin as long as you are also touching the inner surface of the barrel (otherwise you will probably get a reading that is about a volt too low).
As long as the voltage is within reason (~19.5 volts) and stable, continue...
Next, let's check some of the voltages with the power supply plugged in.
Measure the voltage at the following components. You only need to measure one pin from each:
PR103 (main +VIN power rail)
PL12 (3V switching regulator output)
PL15 (5V switching regulator output)
Let's also check the 3V (+3V_ALW) and 5V (+5V_ALW) linear power rails, as well as the AC adapter identification signal (LIMIT_SIGNAL). See attached pics. Note that the arrow is pointing to one specific side of the indicated component.[/QUOTE AC adaptor is 19.5V steady. All other components are missing their voltages, reading are in the mv range.
[QUOTE=BlueMidnight;977977]Let's check the AC adapter. I think I mentioned this early in the thread, but I'll say it again. Plug it in and measure between ground on outside of the barrel and positive on the inside of barrel. It's okay to touch the center pin as long as you are also touching the inner surface of the barrel (otherwise you will probably get a reading that is about a volt too low).
As long as the voltage is within reason (~19.5 volts) and stable, continue...
Next, let's check some of the voltages with the power supply plugged in.
Measure the voltage at the following components. You only need to measure one pin from each:
PR103 (main +VIN power rail)
PL12 (3V switching regulator output)
PL15 (5V switching regulator output)
Let's also check the 3V (+3V_ALW) and 5V (+5V_ALW) linear power rails, as well as the AC adapter identification signal (LIMIT_SIGNAL). See attached pics. Note that the arrow is pointing to one specific side of the indicated component.[/QUOTE AC adaptor is 19.5V steady. All other components are missing their voltages, reading are in the mv range.
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