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  Compaq F756NR Dead 
 
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Wayne Westphal Sep 11, 2010, 04:27pm EDT Reply - Quote - Report Abuse
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I have a Compaq/HP Presario F756NR that when the power button is pressed some of the LED's (power, hard drive, Data por, DVD) tcome on for a brief second and then shut off. I believe I can also hear the hard drive attempt to start. Display does nothing and HP support have been zero help so I need outside help. Some have said it is the motherboard but others have said it could be the RAM or even the hard drive. I do not want to dump a bunch of money into this and surely can not afford to send it in to be repaired. I have the knowledge to replace the motherboard if that is the problem. But I do not want replace the motherboard if it is something else.
Battery is good as is the adapter.


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Jon Bailey Sep 11, 2010, 05:53pm EDT Reply - Quote - Report Abuse
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Edited: Sep 11, 2010, 05:54pm EDT

 
>> Re: Compaq F756NR Dead
still sounds like a power problem to me, have you tried running it from mains power without the battery inserted?

"The world is a temple to the self, and these days, there's alot of believers"
bill224 Sep 12, 2010, 02:36pm EDT Reply - Quote - Report Abuse
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>> Re: Compaq F756NR Dead
2 weeks ago, my 2 year 4month old Compaq Presario F761us has similar problems. nothing can bring screen back. HD, RAM, power supplu, battery, fan are all OK. I even did CMOS batter take out and put back, and connect to external monitor , nothing changes.
whenever I press the power button 3 green lights on/off, on/off ...(power button, power lights, touch pad) forever.
After I disassebled/assembled I got more lights on/off, on/off..(DVD, SD-MS, Wi-Fi).
but still no use--screen totally black, can't reboot, not even get Bios waken-up.

I suspect we got 2nd hand motherboard in stead of original. I found at least 4 or 5 places mark as "replaced", and one a 2-thin-wires(black, red) link between top cover and bottom (motherboard is on bottom) which seems can't disconnect and it didn't mention in anywhere.

I also couldn't remove two screws securing the wireless card.
plus I didn't see any thermal grease or thermal compound(silver stuff) sourand fan there.

I also found there is a cable original didn't properly connect (beside the phone jack#2), I adjust it.

Wayne Westphal Sep 13, 2010, 09:10am EDT Reply - Quote - Report Abuse
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>> Re: Compaq F756NR Dead
Jon Bailey said:
still sounds like a power problem to me, have you tried running it from mains power without the battery inserted?


Yes I have made multiple attempts with and without the battery running on adapter and without adapter results are still the same. I can hear the hard drive attempt to start but nothing. I have removed RAM and hard drive as well and attempted start to see if either was pulling the motherboard down but no luck.
When adapter is plugged in and battery installed charge light does come on until fully charged so something on the mother board is working

Wayne Westphal Sep 13, 2010, 09:13am EDT Reply - Quote - Report Abuse
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>> Re: Compaq F756NR Dead
bill224 said:
2 weeks ago, my 2 year 4month old Compaq Presario F761us has similar problems. nothing can bring screen back. HD, RAM, power supplu, battery, fan are all OK. I even did CMOS batter take out and put back, and connect to external monitor , nothing changes.
whenever I press the power button 3 green lights on/off, on/off ...(power button, power lights, touch pad) forever.
After I disassebled/assembled I got more lights on/off, on/off..(DVD, SD-MS, Wi-Fi).
but still no use--screen totally black, can't reboot, not even get Bios waken-up.

I suspect we got 2nd hand motherboard in stead of original. I found at least 4 or 5 places mark as "replaced", and one a 2-thin-wires(black, red) link between top cover and bottom (motherboard is on bottom) which seems can't disconnect and it didn't mention in anywhere.

I also couldn't remove two screws securing the wireless card.
plus I didn't see any thermal grease or thermal compound(silver stuff) sourand fan there.

I also found there is a cable original didn't properly connect (beside the phone jack#2), I adjust it.


I know mine is not a replacement as it was purchased new. I just think HP/Compaq have a bad design or production issues and will not face up to it since I have read multiple postings on the internet with the same problems but I can not locate any that has replaced the motherboard and solved the problem.

Daniel Desy Sep 22, 2010, 10:27pm EDT Reply - Quote - Report Abuse
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>> Re: Compaq F756NR Dead
I am trying to fix the same problem with the F761US, and I found something interesting happening with the particular one I'm working on. Perhaps you could try this:

If I remove the power adapter, battery, and CMOS battery for a few minutes and then reinstall them, the system boots fine. Once booted, it will run without issue until it is shut down or rebooted. To start it again, I repeat the same process.

After a fair amount of diagnosis, I found that the problem does indeed seem to be related to the motherboard. The RAM, hard drive, battery, and power supply all seem to test fine. Unfortunately, based on what you have seen I think you probably have a similar problem.

Middi Iro Jul 19, 2012, 09:02pm EDT Reply - Quote - Report Abuse
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>> Re: Compaq F756NR Dead
Has there been any updates or success in fixing this problem?


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