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Dell E7440 and E7450 won't turn on if BIOS battery exist! Strange problem! HELP!!
Dear Community,
I have a strange problem. My Dell E7440 and E7450 won't turn on if BIOS battery is connected.
I press power button and only power led turns on for 10-15sec than off. Nothing.
If I remove BIOS battery the laptop boot normaly after done the post tests.
Put back BIOS battery and no boot, no post.
I tried several used CMOS battery from different Dells and I also tried with brand new CR2032 with 3.30v
WHAT IS THIS?? HOW CAN I FIX?? HELP?
Motherboards are brand new replaced ones from Dell service center. (replaced under warranty when the laptop had warranty)
U2CAMEB4ME
6 Operator
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6245 Posts
4215
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Posted September 26th, 2019 08:00
Welcome to the Dell Community @KBSLAT
Engineering defect/design that will never be resolved.
E5xxx and E7xxx series laptops Possible Engineering Defect???
Like you I found some units would not work properly even with a new BIOS battery???
Sorry I wish I could have found the cause of the defect but I refuse to do Dell's job for them.
Best regards,
U2
Laptop Junky
3 Posts
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Posted October 30th, 2020 00:00
I have a e7440 with same issue, I powered up laptop with cmos battery unplugged, then while laptop was powered on and working I plugged the cmos battery back in the motherboard, after plugging battery back in turn power off manually and then back on, this solution worked for me, just wear surgical gloves or something that will not produce static electricity because you have power coming into the laptop so caution is encouraged,
KBSLAT
1 Rookie
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4 Posts
4212
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Posted September 26th, 2019 08:00
You mean its engineering defect? I test now maybe some other component fault this is. The board is fully tested and it was working!