hi i have hp 4540s when i shutdown after 3 second auto start .i programmed bios but same .what is this problem?
-
I have problem with my laptop, with code board X415EA 2.0,
laptop cannot shutdown with baterai only, if i plug the adaptor, laptop can shutdown, but when the adaptor was unplug, laptop wake up
I did :
1. Flash Bios
2. RTC_RST 3.3V
3. LID_SW 3.3V
4. WLAN_WAKE# 3.3V08-26-2025, 04:42 AM -
HP ELitebook 840 G4, if shutdown does not start, until cmos reset or with key WIN+B, when restart it start normaly but if shutdown does not start.
- power button working
- Bios updated to latest
- CMOS Battery changed
- Battery charged -
I received the PSU today. A quick check revealed a shorted 12V output rail, which is caused by a half dead dual Schottky rectifier. I replaced it, and was able to turn on the PSU but very briefly for a few seconds before the protection kicks in and shut it off.
I'm not sure what is wrong.
All output rails seem ok, with 3.3V maybe a bit higher at 3.6V
Interesting to note, my light bulb is shining brightly while the PSU is running, like there is a short, instead of blinking rapidly as usual when there is an active PFC circuit involved.
PSON... -
Hi, I have this Lenovo Legion with a strange problem. Just with AC adapter , I have 3 and 5V ALW but the notebook not start when i press start buton.
If I conect just the battery the notebook start widhout any problem.
i was check and i have the AC OK , AC Present, EC RSMRST.
On page 16 i not have PM_SLP_S5#_R when i press start with AC adapter but if i just conect the battery and press de start buton i have 3v PM_SLP_S5#_R.
If i reset the bios and conect the ac adapter the notebook start well automatic ( normal) but if i press the power...02-01-2024, 06:52 AM -
This specification for the HP ProBook 4540s can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 4540s boardview and 4540s schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 4540s is accurate,...09-06-2024, 05:27 AM