DV6500, no, it is not the video chip.

**mockingbird** · 05-25-2010, 09:12 AM

Re: DV6500, no, it is not the video chip.

Someone here mentioned in a different thread that you need to clean underneath some of the pins as well with alcohol and then make sure to blow air underneath it to evaporate all the alcohol.

If the guy spilled a sugary substance, I would not bother at all personally (Though YMMV), because IMHO, alcohol will not dissolve that.

**chevelle_nut** · 05-25-2010, 10:05 AM

Re: DV6500, no, it is not the video chip.

Thanks, I think I will revisit those places to see if I can wash under the chips. Whatever the goo is it seems to come off pretty well with the q-tip/alcohol method - so far... I only tried to recoup this as it was orphaned here (so basically I am only into it for the labor to fix it) and, if you look at how little area is actually affected [just due to the fact that SO much of the topside is covered by plastic shielding] it did not look like such a daunting task. I am also trying to use it to train my son. The incentive for him is when it comes back to life - he owns it.

**chevelle_nut** · 05-25-2010, 05:35 PM

It is ALIVE !!!

Thank you Mr. Bird Sir. I gave it the toothbrush/alcohol scrub then blew it out with compressed air ( normally I would claim canned air, but I really wanted to get the pressure to it so I went to the garage and ...well you know.)

Long story short the first time I cleaned it (with canned air) it did make a difference - it did nothing, no lights, no fans, nothing. So convinced I was onto something since I got a change for an action - I did it again, with the compressor. Bingo!!! lights, fans, boot time !
Still going to pull it back apart to paste the heat sinks (get the copper shim kit on order) and final assemble it. I'll let you know if the battery charges, if not I will have to have that MAXIM chip swapped as I am not equipped to try that.

Although I guess I could justify buying a reflow heat gun with the cash I saved...

**mockingbird** · 05-25-2010, 06:15 PM

Re: DV6500, no, it is not the video chip.

Props should go to PCBONEZ from this post from this thread. Glad you got it working!

**chevelle_nut** · 05-27-2010, 08:39 AM

Re: DV6500, no, it is not the video chip.

You have no idea how much that thread has affected me. I have religiously avoided contact between electronics and water for as long as I can remember. I have always used isopropyl and canned air for cleaning. I have always felt it was a reasonably successful method, albeit expensive. I have avoided using my shop air for anything except heat sinks and cases (always concerned over oil contamination). This Simple Green method is so much faster and less expensive I will probably go through my "laptops for parts" pile to see if any can come back to life.

Big props to TopCat and PCBONEZ, thank you, again.

Mr Bird, thank you for pointing out that method to me.

Now back to our regularly scheduled thread, already in progress...

**chevelle_nut** · 05-27-2010, 08:54 AM

I need a little primer on MOSFET theory

So now the laptop boots up, keyboard is a partial cleaning succes, some of them work,some do not -I am just going to order new to replace.

It boots up only off battery. Will not boot with adapter connected. It does run on adapter. Once it does boot it shows on adapter, 0% battery -not charging. So I can troubleshoot it at least.

I see a FDS6679AZ in the power circuit that reads 18.4vdc on the source side, 28.4vdc at the gate and 11.6vdc on the drain. I have read on other threads that the low output voltage indicates a failure and the mosfet should be swapped out. If I recall correctly the gate voltage on the Dell units is ~6vdc. where is the 28 coming from ??? I am referencing all these voltages from the negative terminal on the mb where the power cable connects. Could this overvoltage be causing the MOSFET to not gate properly or is it just plain toast? Also, can I just bridge accross the mosfet with a gp diode to see if this is the no charge issue , or is more likely that the MAXIM is junk and pulling down the drain side. So many questions, sorry.

**chevelle_nut** · 05-31-2010, 05:53 AM

Update:

The FDS6679AZ is currently on back order at Digi-Key. I found out why it checks good on the board tho. The source and drain connections have an external diode across them on the opposite side of the board. I have also found a shorted zener in the same area of the board. The Maxim 8724 chip is still a key suspect and it will be swapped out (as soon as I have a method to R&R it). There is some corrosion on the side of pins 22-28 and the trace from pin 21(i think) is burnt - a solder bridge should touch that up.

On hold for now -waiting for parts...

**chevelle_nut** · 07-18-2010, 08:32 AM

Re: DV6500, no, it is not the video chip.

Long overdue update here, parts have all arrived. I made an attempt to remove the damaged parts. I did manage to remove the 6679 but also removed a 10k resistor in the process. I also found a bad zener (SSM34PT). I have those in my possession now as well. I cannot get the maxim off, so I have elected to farm this one out. It is at the board shop as I write this.

More later ...

**mockingbird** · 07-18-2010, 12:49 PM

Re: DV6500, no, it is not the video chip.

I have a Compaq N610c with a tiny resistor that I knocked off around the USB port. The trace came out as well so the only way to get that porn working again would be to theoretically run a jumper wire from the resistor to the trace underneath if it goes through the PCB -- which in hindsight - it doesn't... The port still gives me 5v so I use it for the laptop cooler pad underneath, it powers three fans and the other port works and powers a cheap pair of USB speakers (Changed the Hermei capcacitors on there to UCC when they died)...

I also have a Radeon 9700 where the resistor came off the bottom right corner of the card. Impossible to solder back on, it's just too small. Card works alright though...

**chevelle_nut** · 08-07-2010, 08:59 AM

Re: DV6500, no, it is not the video chip.

Everything back together, new parts installed - it now charges and will power on with adapter installed. I was so excited I did not get pics while reassembling it

.

When it was all assembled I could not get the cd/dvd burner to be recognized - thought I had more hardware problems. Turns out I should have been more suspicious of Vista... applied the Microsoft Fixit and tah-dah it worky !!! << grrr, man I loath Vista >>

Boot into recovery and reinstall Vista from scratch, apply all updates and service packs, the upgrade to 7 Ultimate - works great. I kept getting message about quicklaunch not being compatible with 7, I have not tried it but everything else works great.

By the time it was all said and done I have waaaay too much time and $$$ invested in this. I am chalking it up as a learning experience. My son is however very impressed and enjoying his new laptop (minor consolation).

I am not sure I have learned enough not to try to repair something this far gone, or if I will just spend more money on the proper tools next time ...

Thanks again for all your help and support

**Wrog** · 08-07-2010, 09:35 AM

Re: DV6500, no, it is not the video chip.

Originally posted by chevelle_nut

I cannot get the maxim off, so I have elected to farm this one out. It is at the board shop as I write this.

Did you end up using someone local, or do you use one of the eBay motherboard repair services?

**Th3_uN1Qu3** · 08-07-2010, 09:42 AM

Re: DV6500, no, it is not the video chip.

Originally posted by chevelle_nut

I kept getting message about quicklaunch not being compatible with 7, I have not tried it but everything else works great.

I have a program that you can use instead of quicklaunch buttons crap. The media keys should work by themselves in Win7, while my program changes the function of those that normally opened HP's media player, now you can make them open any program you wish.

http://quickplay.hostzi.com

**chevelle_nut** · 08-07-2010, 10:13 AM

Re: DV6500, no, it is not the video chip.

Originally posted by Wrog

Did you end up using someone local, or do you use one of the eBay motherboard repair services?

I ended up at a place in Miami. Oddly enough they do have an Ebay listing.

Th3_uN1Qu3: Thanks for the Quickplay info, at this point as I said I do not know if they work or not. If son decides he needs them then I'll certainly look into it. Does your program have anything to do with the Ir remote ? My son certainly seems interested in using the remote for DVD player.

**Th3_uN1Qu3** · 08-08-2010, 01:32 PM

Re: DV6500, no, it is not the video chip.

Originally posted by chevelle_nut

Does your program have anything to do with the Ir remote ? My son certainly seems interested in using the remote for DVD player.

No, my program doesn't handle the remote, but if you have the receiver driver installed (ENE CIR Receiver Driver, that's how it's called on HP's site), the remote should work by itself in Windows Media Center (and others as well, but that's what it's optimized for).

**Gasasoft** · 01-23-2011, 04:59 PM

Re: DV6500, no, it is not the video chip.

Chevelle_nut!
I read your post and delighted by the way you do business. And I have a similar problem with one accer laptop. When I turn on the power nothing happens. On the power supply voltage is 18.5 V. I noticed that the over-heated MAXIM 8724. Is this a sign that is blown or other component that affects it is heated. I live in Serbia and it is difficult to be able to get that component, but from another mother board. I am interested in your opinion what to do. Replace maxim or something else. And where to get easier.
Thanks in advance!

**TheLaptopDoctor** · 02-13-2011, 04:14 PM

Re: DV6500, no, it is not the video chip.

The address for MAXIM is http://www.maxim-ic.com
Usually they will send you one or two for free, or just get the 'evaluation kit/sample part'

**TheLaptopDoctor** · 02-13-2011, 04:20 PM

Re: DV6500, no, it is not the video chip.

Originally posted by mockingbird

Someone here mentioned in a different thread that you need to clean underneath some of the pins as well with alcohol and then make sure to blow air underneath it to evaporate all the alcohol.

If the guy spilled a sugary substance, I would not bother at all personally (Though YMMV), because IMHO, alcohol will not dissolve that.

What I do is take off all the plastic sheeting and actually rinse the board in pure boiling water (Aquafina works well) and let it soak for 5 min, rinse again, then with an air compressor remove as much as possible, sun dry on warm days. If not sunny. Rinse with Acetone (pure, not nail polish remover) The acetone will dry additional alcohol as well as evaporate quickly. But a heatgun on low will also help.

Do not use heat gun immediately after using acetone, nor anywhere near acetone-> Fire hazard

**Dimitrios** · 11-28-2013, 09:26 AM

Re: DV6500, no, it is not the video chip.

Hello, please check both sides for voltages in these 2 diodes!
Should have 19 Volts! Had 2 motherboards with the same fault!

DV6500, no, it is not the video chip.

DV6500, no, it is not the video chip.

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