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COMPAQ PRESARIO NO POWER AND CHARGING ISSUE

Last response: in Laptops & Notebooks
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September 14, 2011 8:52:19 AM

compaq presario cq40 not switching on and no power and charging,not even power led is blinking which is integrated in power jack..i took a visual look there is one burned capacitor near battery connector i changed that but stil laptop is in same condition.can anyone plz tel me that how to find and fix a fault is laptop dead,i m a poor guy and earn money by repairing computers this is a only way to earn money for me...plz sumone help me i will be really very thankful to him..
a b D Laptop
September 14, 2011 3:30:14 PM

get a wiring diagram for the laptop and get a multi tester. beyond that it could be a fried motherboard that needs replacement
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a b D Laptop
September 14, 2011 3:39:18 PM

if you plug the power supply into the wall socket, does the LED turn on if the laptop is not connected to it?
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September 14, 2011 6:48:18 PM

no the led is still off
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September 14, 2011 7:04:07 PM

That would probably indicate a bad charger.

If you had a separate power supply you could test this. You can order an OEM replica from amazon for a pretty good price typically.

To test this, you could use a multimeter to see if your getting a charge from it. Just use the black contact on the outside of the metal and touch the inside of the charger plug with the red contact.
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September 15, 2011 8:41:20 AM

ya i have checked the charger with multimeter,charger giving right voltage i.e 19v,13v and also checked the mother board,mobo getting charge from it but not passing it to other component,i capacitor was burn so i changed that but so result,i m posting the picture of mobo that will help u to understand the whole story
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September 15, 2011 8:47:03 AM

and thanx for giving me ur time i m really thanxful to u for ur help and plz keep helping to solve this trouble..
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September 15, 2011 12:12:48 PM

i checked it with new battery,laptop turn on and charging light also start bilinking,but the light is only blincking when laptop is on after turnoff light also goes off and without batter laptop is not turning on i mean i cant turn it on by direct power supply only
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a b D Laptop
September 15, 2011 3:38:08 PM

bad charger?
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September 15, 2011 5:59:50 PM

i tried it with new charger but the condition is same
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September 15, 2011 6:16:17 PM

i checked it with new battery,laptop turn on and charging light also start bilinking,but the light is only blincking when laptop is on after turnoff light also goes off and without batter laptop is not turning on i mean i cant turn it on by direct power supply only
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September 16, 2011 7:16:17 PM

no ac adapter is not a problem i tried new adapter one of my friend,is there any ic in motherboard for charging a battery or any power ic if yes thn plz tel me how to test that with digital multimeter or another way to check that ic is working or not..
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September 16, 2011 7:22:15 PM

is there anything which is use to pass or operate current in laptop
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February 23, 2012 4:52:36 AM

Sorry to kick up this topic, but I have the same problem.

Did you find any solution for this?

tia! ;) 
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April 24, 2012 6:11:36 PM

wasekhan said:
compaq presario cq40 not switching on and no power and charging,not even power led is blinking which is integrated in power jack..i took a visual look there is one burned capacitor near battery connector i changed that but stil laptop is in same condition.can anyone plz tel me that how to find and fix a fault is laptop dead,i m a poor guy and earn money by repairing computers this is a only way to earn money for me...plz sumone help me i will be really very thankful to him..





pls change the bios of cq40 your problem will be solved


sachin 9358687233
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April 14, 2013 11:11:04 PM

sachin_28 said:
wasekhan said:
compaq presario cq40 not switching on and no power and charging,not even power led is blinking which is integrated in power jack..i took a visual look there is one burned capacitor near battery connector i changed that but stil laptop is in same condition.can anyone plz tel me that how to find and fix a fault is laptop dead,i m a poor guy and earn money by repairing computers this is a only way to earn money for me...plz sumone help me i will be really very thankful to him..





pls change the bios of cq40 your problem will be solved


sachin 9358687233



sir, me too got the same problem, does changing the bios solve this?. the bios ic or just the battery? huhu, i'm so noob in repairng.

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January 24, 2014 6:04:01 AM

hi @cristopher, have u solved your problem. I just got the same problem. My hp compaq cq40 went blank screen, fan sounded really load then stopped working until now, the num/caps lock blinking once every 3 seconds, dvd is making sound.
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