Solved How can we check CMOS battery's health without removing it?

January 23, 2020 at 23:28:10
Specs: Windows 10
I have a Dell laptop 3340, sometimes it doesn't start when i press the power button it does not gives any display on screen , after several attempts it starts normally. Date and time are still there without any change, i mean date and time found correct. what will be the problem? Do i need to change the CMOS battery?

See More: How can we check CMOS batterys health without removing it?


✔ Best Answer
January 24, 2020 at 12:26:13
Equaly... and a long shot...

Is, does, (was) the battery charge(d) fully?

Are you certain the power adapter is ok?

Many laptop on/off buttons are simply pressing on contact beneath, and the system latches “on” until that button is pressed again as in off..

There might be muck in that area. It might the latching chip (for want of a better term just now) is faulty. Essentially a form of self latching relay - which fails to latch in rhe on position?

If you blow compressed air around the system, best to remove the laptop base cover and then blow compressed around all air vents, and the processor, and in the area beneath the on/off button.

If you can borrow an ac adapter compatible with your laptop, try that first. It might just be the one you have is no-longer delivering adequate volts, - even though led lites come wherever. Those adapters can and fail... and often in a somewhat misleading manner.



#1
January 24, 2020 at 02:39:44
Most common indicators are a keyboard message to press F1 & clock/date
time wrong.

But there are other indicators.
https://www.rocksdigital.com/cmos-b...


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#2
January 24, 2020 at 02:44:37
nope it wont be the battery, double check it by changing a setting in the bios, save&reset, go back to the bios (if it is still the same you're good)

what are the symptoms? lights turn on but no display? any beeps? if so how many?
does it behave any differently if you remove the battery?

i5-6600K[delid]@4.8GHz Core/4.6 Cache@1.456v | 2x8GB DDR4-3200MHzCL12-12-12-28-1@1.5v | Sapphire Nitro+ SE RX 590 8GB@1610Mhz core@1.13v/2236MHz


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#3
January 24, 2020 at 07:38:48
Do you have reasons to think it isn't just the power button?

Other than the fact that it seems very odd that the power button
would be the first thing to go?

This is pure speculation, but I wonder if it might be a bad capacitor
connected to the power button or power supply.

-- Jeff, in Minneapolis


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Related Solutions

#4
January 24, 2020 at 07:44:32
Thanks a lot for ur response...
actually when i press the power button the indicator light on of power button glows, that means it is now turning on, but there is nothing appear on screen.. some movement later, the laptop power become off automatically.. i removed the power battery, and plug in the charger but the same situation arises... there are no sound beeps..

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#5
January 24, 2020 at 09:12:38
When's the last time you cleaned the cooling passages? If you have a can of compressed air, give a good blast into all the vents. If you haven't done it in a while (or ever), you'll be amazed at the cloud of dust that comes out. The cheapest place I've found to get canned air is Harbor Freight. Use their 20% off coupon plus pick up a freebie while you're there (tarp, flashlight, batteries, tape measure, etc).

https://www.harborfreight.com/10-oz...

https://www.harborfreight.com/
https://go.harborfreight.com/?utm_m...


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#6
January 24, 2020 at 09:25:49
The laptop needs to be opened up and examined. Probably not
anything you can find by eye, but if you want to and feel up to it,
you can look. Otherwise take it to a shop for an exam. Of course,
if it is still under warranty, you can make use of it.

A loose connector or a bad capacitor are the only things that you
would be likely to detect by eye, and a loose connector might be
easily fixed.

A remote possibility is that it is packed with dust. That could do it.

-- Jeff, in Minneapolis


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#7
January 24, 2020 at 12:26:13
✔ Best Answer
Equaly... and a long shot...

Is, does, (was) the battery charge(d) fully?

Are you certain the power adapter is ok?

Many laptop on/off buttons are simply pressing on contact beneath, and the system latches “on” until that button is pressed again as in off..

There might be muck in that area. It might the latching chip (for want of a better term just now) is faulty. Essentially a form of self latching relay - which fails to latch in rhe on position?

If you blow compressed air around the system, best to remove the laptop base cover and then blow compressed around all air vents, and the processor, and in the area beneath the on/off button.

If you can borrow an ac adapter compatible with your laptop, try that first. It might just be the one you have is no-longer delivering adequate volts, - even though led lites come wherever. Those adapters can and fail... and often in a somewhat misleading manner.


Report •

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