Hi guys
I have a B&O Omen laptop here. It has very specific fault symptoms, hopefully someone can give me some guidance
If I plug in a known good 180W third party charger the little LED next to the power jack on the laptop flashes red once, but the laptop will not start. It will not flash red again unless you unplug and reconnect the power.
If I remove the main battery (I can't see a cmos battery) then the led by the jack does not flash when I plug in the adapter, but if I press the power on button with adapter attached it flashes once white every time I press the button, for a number of presses, then it stops flashing white until I remove and reapply the power in which case the same happens.
I tried removing the battery and holding down power for one minute - it did not help
I measured the resistance on all the buck coils, I can see two that have a low resistance around 2 ohms, and another .7 ohms, but these are right next to the GPU and CPU so this seems reasonable
If I press the power button, no battery, and measure the voltage on all the buck coils I can see every time the white LED flashes , nothing powers up, not even for an instance, unless it is too fast for my meter to react
One buck coil next to the battery connector behaves oddly.
With the power jack and battery connected it initially reads 3V but keeps dropping like a discharging capacitor, settling at about 0.75V
With power jack applied but no battery it starts at about 1.2V and climbs up like a capacitor charging, setting at 2.75V
Checking from ground to the battery connector (battery inserted, no power jack) I see 3V on one pin (5th from left) but nothing on any of the other pins
From ground to battery connector with power jack connected I see 2.7V discharging down to about 0.75V on pins 1 and 2 (from left) and I still have 3V on pin 5
Is this trying to tell me something useful, like I have a faulty battery maybe? Or something else?
Cheers
Rich
I have a B&O Omen laptop here. It has very specific fault symptoms, hopefully someone can give me some guidance
If I plug in a known good 180W third party charger the little LED next to the power jack on the laptop flashes red once, but the laptop will not start. It will not flash red again unless you unplug and reconnect the power.
If I remove the main battery (I can't see a cmos battery) then the led by the jack does not flash when I plug in the adapter, but if I press the power on button with adapter attached it flashes once white every time I press the button, for a number of presses, then it stops flashing white until I remove and reapply the power in which case the same happens.
I tried removing the battery and holding down power for one minute - it did not help
I measured the resistance on all the buck coils, I can see two that have a low resistance around 2 ohms, and another .7 ohms, but these are right next to the GPU and CPU so this seems reasonable
If I press the power button, no battery, and measure the voltage on all the buck coils I can see every time the white LED flashes , nothing powers up, not even for an instance, unless it is too fast for my meter to react
One buck coil next to the battery connector behaves oddly.
With the power jack and battery connected it initially reads 3V but keeps dropping like a discharging capacitor, settling at about 0.75V
With power jack applied but no battery it starts at about 1.2V and climbs up like a capacitor charging, setting at 2.75V
Checking from ground to the battery connector (battery inserted, no power jack) I see 3V on one pin (5th from left) but nothing on any of the other pins
From ground to battery connector with power jack connected I see 2.7V discharging down to about 0.75V on pins 1 and 2 (from left) and I still have 3V on pin 5
Is this trying to tell me something useful, like I have a faulty battery maybe? Or something else?
Cheers
Rich
Attached Files
Comment