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Hp pavilion dv4 1280us CMOS battery error code 502

Do have to replace the who CMOS battery case and cable or just the CMOS Battery coin

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Only the coin battery on board. They come different ways. Mine had a battery with a wire connected, another had just a coin size 2020. Different configurations around but ow days its just a coin size battery.

Posted on Mar 26, 2014


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Hp pavilion zd8000 2short 1long beep no display/no boot up

a laptop take out the big battery pack first.
Does it stay on? does the fan blow while one.
is there text ever ?
do the BIOS keys work?
cool real beeps presented.
dit dit , dah = code U (morse) or the reverse? dah, dit dit
is the CMOS coin cell battery 12 years old? oops, fail.

step one is age what year it is , the beeps match years,
zd8000 is RETIRED, zero support, books or drivers./
XP is bad news,
this thing is super old. with relic Pentium 4 (wow a dog that is.)
old notebook.
take out the big battery first, they short.
step to unplug all cables but that AC pack cable.
2005 is not too old, but 10 years old HP cuts the cord.
XP ran to 2008 , so PC 2009 or newer are best to own with W7
but lets learn the beep codes
power on , hammer f10 key (BIOS pages)
if you see nothing (battery out) that means it lost power
or there is short in the main board , or the CCFL lamps black lamps are deed, use a flashlight on screen see data now
YES then the black lamps burned out. as all do this old.
same test as above try and external screen on the VGA jack
works now?
yes, good, your internal screen is bad
no , the power is lost to to the main board.
i use a voltmeter at the jack on main board, 19vdc is it.
10v bad powerpack.
if the pack is ok we strip all modules off the main board to find who is shorted,

the beep codes are very poorly documented,(changed often)
and not same on desktop as lap top.
common codes are
bad ram (try 1 stick at a time mine has 4 so 1 by 1 in bank0 test.
bad VGA GPU chip or its shared dram above is dead
bad CMOS COIN cell, causing , corrupted cmos errors.
and more, some BIOS have 3 or 4 errors others have 25 or more.
Award BIOS is very complex. if that is what you have.
bad battery pack (main power is weak)
Bad power pack,its weak.
CPU bad, (rare as hens teeth if it did fall out)
CPU overheating.
The service guide skips this on this laptop.

some hp docs are there, but not indexed, i do site search to get old books. ask.
seen here,

Aug 27, 2017 | HP Computers & Internet

3 Answers

Bios password for HP Pavilion Notebook - 15-p184ca

Remove the cmos battery and if there is a pin connection for clearing the bios use that also. Also remove any battery or power source to unit. Wait about an hour and then put all back. Password should be gone.

Aug 22, 2017 | HP Computers & Internet

2 Answers

Computer says no video input signal beeps 7 times?

okies hmmmmm, ok turn it on, leave it running for about 20-30 mins, switch it off then turn it back on if it comes on then its prob a motherboard problem, would you know if it has ever been dropped? but try that. :))

Apr 16, 2014 | HP PAVILION A6230N DESKTOP PC

1 Answer

502 error code on hp pavilion dv4 1280us

Remove the bottom cover of the laptop. The CMOS battery is a disc 3.2 volt li-on battery. replace it with the same voltage and size battery.

Mar 26, 2014 | HP Pavilion Computers & Internet

1 Answer

Cmos battery error failure

The CMOS (BIOS) battery keeps the computer'a comfiguration and the Date & Time settings in the CMOS (BIOS) chip in its memory. When the CMOS (BIOS) battery is flat these configuration information is lost.
Replace the CMOS battery with a new one, in most cases this battery is a lithium 3 volt battery type CR2032 and it is coin size battery 18mm in dia.(check it to make sure the type of battery is installed on your motherboard).
When you replace this battery then go into the BIOS and set the Date & Time etc.

Jan 26, 2012 | Intel DG31PR Motherboard

1 Answer

My girlfriends Hp Pavilion A305W powers on then automatically powers off after it show a brief error message but also says F1 for startup. Should i press F1 and continue diagnosis?

Most probably your system is not getting your BIOS settings from your mainboard due to CMOS battery failure.

Check your CMOS 3.0v battery & replace it. Then reconfigure your BIOS settings from the CMOS setup.

Hope it helps

May 28, 2011 | HP Pavilion a305w (DM181AR) PC Desktop

1 Answer

Booting process interrupted during the booting process, pc reports error, press f1 to view setup or f2 to continue.

Try going to the setup and loading the default values. If this does not solve your problem its time to change your CMOS battery. Turn your system off. Open your case. You will find a coin like component. That is your CMOS battery remove it and replace it with a new one. When booting for the first time after replacing the battery,enter the correct date and time.

Nov 16, 2010 | HP Computers & Internet

2 Answers



The CMOS battery is a coin battery with the model number CR2032

This is what they look like >>>>>>>


Mar 08, 2010 | HP Pavilion a350n PC Desktop

1 Answer

CMOS Error


2 things, first, you simply need to replace the cmos coin cell battery or worst case scenario, your processor may already be on its way to failing.

Oct 15, 2008 | Intel Pentium 4 505J Prescott 533MHz...

3 Answers

Error 0270

I beleive that error is the "realtime clock" error code. Most likely is the CMOS battery needs to be replaced.

Feb 22, 2008 | HP Pavilion dv6000z Notebook

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