Try a full power refresh in case the BIOS has become corrupted and is preventing a normal start i.e the laptop is not passing POST (Power On Self Test)
Here’s the procedure:
***a).*** Disconnect the charger if connected.
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***b).*** Disassemble the laptop, disconnect/remove the main battery and remove the [https://rometechbatteries.com/rtc-cmos-battery-for-panasonic-toughbook-cf-52/|coin cell cmos battery] (supplier example only to show battery) from the motherboard. Here’s a teardown [link|https://www.youtube.com/watch?v=X6AzqdAwXn4&list=PL_ntP3EI-k2T0HnGo1X7zaMNej5Xe0wMQ&index=6|video] for the laptop. The battery can be seen being removed from ~13:50 minutes into the video When the cmos battery is removed from the laptop, use a DMM (voltmeter function) to measure the battery’s voltage. If it is <2.6V DC or >4-5 years old replace it. Search online for ''Panasonic CF-52 cmos battery'' to find suppliers that suit you best.
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***b).*** Disassemble the laptop, disconnect/remove the main battery and remove the [link|https://rometechbatteries.com/rtc-cmos-battery-for-panasonic-toughbook-cf-52/|coin cell cmos battery] (supplier example only to show battery) from the motherboard. Here’s a teardown [link|https://www.youtube.com/watch?v=X6AzqdAwXn4&list=PL_ntP3EI-k2T0HnGo1X7zaMNej5Xe0wMQ&index=6|video] for the laptop. The battery can be seen being removed from ~13:50 minutes into the video When the cmos battery is removed from the laptop, use a DMM (voltmeter function) to measure the battery’s voltage. If it is <2.6V DC or >4-5 years old replace it. Search online for ''Panasonic CF-52 cmos battery'' to find suppliers that suit you best.
***c).*** ''Press and hold the laptop’s Power on button for 30 seconds and then release''. This will restore the BIOS back to the factory default settings.
***d).*** Reinsert/reconnect the cmos battery (or replacement battery)
***e)***. Reassemble the laptop and connect the charger.
***f).*** Switch on the laptop and check if it starts OK. There may be a message on the screen about the date and time being incorrect. This is normal as the BIOS has been reset. Once the date and time have been corrected, the message won’t appear the next time that the laptop is started. Any user definable BIOS settings that were changed by you to suit whatever operating requirements you wanted, will have to be changed back again as well
Hi @kentb74762
Try a full power refresh in case the BIOS has become corrupted and is preventing a normal start i.e the laptop is not passing POST (Power On Self Test)
Here’s the procedure:
***a).*** Disconnect the charger if connected.
***b).*** Disassemble the laptop, disconnect/remove the main battery and remove the [https://rometechbatteries.com/rtc-cmos-battery-for-panasonic-toughbook-cf-52/|coin cell cmos battery] (supplier example only to show battery) from the motherboard. Here’s a teardown [link|https://www.youtube.com/watch?v=X6AzqdAwXn4&list=PL_ntP3EI-k2T0HnGo1X7zaMNej5Xe0wMQ&index=6|video] for the laptop. The battery can be seen being removed from ~ 13:50 minutes into the video When the cmos battery is removed from the laptop, use a DMM (voltmeter function) to measure the battery’s voltage. If it is <2.6V DC or >4-5 years old replace it. Search online for ''Panasonic CF-52 cmos battery'' to find suppliers that suit you best.
***c).*** ''Press and hold the laptop’s Power on button for 30 seconds and then release''. This will restore the BIOS back to the factory default settings.
***d).*** Reinsert/reconnect the cmos battery (or replacement battery)
***e)***. Reassemble the laptop and connect the charger.
***f).*** Switch on the laptop and check if it starts OK. There may be a message on the screen about the date and time being incorrect. This is normal as the BIOS has been reset. Once the date and time have been corrected, the message won’t appear the next time that the laptop is started. Any user definable BIOS settings that were changed by you to suit whatever operating requirements you wanted, will have to be changed back again as well