2009 Compaq Laptop - Blown power IC

Channel Hopper · Feb 19, 2018

On the bench at the moment after the customer said it was dead (no lights).

Having removed the wayward screw that was rattling around under the motherboard, I've located a blown component Q528, that has the legend PF8AN and then FDS.

If there is any more wording then it has charred away.

So, does anyone have an idea which chip this is and if there is a direct replacement. It sits in the higher current part of the circuit and so I assume it was taken out when the screw bridged part of the board.

Thanks in advance

Terryl · Feb 19, 2018

Crud...I just 86'ed a bunch of old laptop MB's a few weeks ago, several could have been from Compaq, now for that chip, it looks to be one made by Fairchild, (now made by ON semiconductor) but the part number looks to be burnt off, the other numbers are it's package SMD descriptive.

Code:

http://how-to.wikia.com/wiki/Howto_identify_integrated_circuit_(chip)_manufacturers_by_their_logos/F-J

Here is a guide to their stuff

Code:

http://www.onsemi.com/PowerSolutions/home.do

It could be a DC power MOSFET

Channel Hopper · Feb 19, 2018

If you look at the image, the other Fairchild chips have the same identification, which is why I was unsure any data was missing.

If they do/did have a contract with HP/Compaq then this might be the reason for witholding full part numbers,

I also have a few laptop Mobos from the same era, so far none I've checked over have a similar chipset.

Terryl · Feb 19, 2018

If you go to the ON semi site and type in the FDS 8880 for the other chip that I can see, it will come up with that part, what your missing is the FDS 69XX number for that part.

Terryl · Feb 19, 2018

Have you tried a google for any photos of that MB?

What is the model number of the laptop?

Channel Hopper · Feb 20, 2018

NC6220

Terryl · Feb 20, 2018

Well I found a ton of photos for that one, but none would blow up in good enough quality to see the parts, you know, it may be cheaper and a better idea to replace the MB totally, you don't know if something else is FUBAR due to the loose hardware.

Here is a start, but you should look for the exact MB part #.

Code:

http://www.centrix-intl.com/details.asp?Parent2ID=1&productid=12124

Channel Hopper · Feb 20, 2018

My thoughts exactly, just getting the client to approve mono replacement as of this morning.

How far are you from Jellystone ?

2cvbloke · Feb 20, 2018

The best repair for a HP computer (yes, I know it's branded as a Compaq, it's still made by HP!!) is a swift blow with a hammer and tossing in the nearest bin...

Terryl · Feb 21, 2018

From Yellowstone........685 miles as the lava fly's....But I worry a bit more about Long Valley.....its only 75 miles from me and I would be under several feet of hot lava or several dozen feet of hot ash.

I'm within the ash fallout zone for Yellowstone, but I have freinds about 45 miles from it, I have been watching the EQ maps for anything possible.

Terryl · Feb 21, 2018

2cvbloke said:
The best repair for a HP computer (yes, I know it's branded as a Compaq, it's still made by HP!!) is a swift blow with a hammer and tossing in the nearest bin...

We call them compactor food...As I said above I had some Compaq MB's here but sent them to the recyclers after stripping all the gold off them, over the years I have recovered about 2 OZ of gold and a 1/2 OZ of other rare Earth elements, this takes a lot of MB's and other electronic scrap to make up that much, and you need to know what to look for and how to separate it from the base metals.

Copper is another collectable, #2 scrap copper is about $2.00 a pound, (depending on market values) but if you strip it down and melt it into bars it can be called #1 copper and that can range from around $2.25 to $3.25 a pound depending on market.

Channel Hopper · Mar 1, 2018

MOBO arrived (looking good)

Installed (looking good)

Powered up, no POST messages.

On top of this the board has no position for a 3V cell battery, but neither did the faulty one. First time I've seen that.

pgh13 · Mar 1, 2018

Seem to remember the CMOS backup is sometimes provided by an RTC module? Just a thought

RustySpoons · Mar 1, 2018

They do have a CMOS battery, it's not on the board but should be there and plugged in, it's somewhere under the facia that goes around the keyboard from memory.

Channel Hopper · Mar 4, 2018

Thanks, will have a look tomorrow.

Channel Hopper · Mar 4, 2018

Ah,

RustySpoons · Mar 4, 2018

Channel Hopper said:
Ah,

What was that filmed on, shocking! I've seen channels on 7w with better quality.

Channel Hopper · Mar 4, 2018

RustySpoons said:
What was that filmed on, shocking! I've seen channels on 7w with better quality.

Standard answer, a potato.

2009 Compaq Laptop - Blown power IC

Channel Hopper

Suffering fools, so you don't have to.

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Terryl

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