Charger with reversed polarity plug inserted while attempting to charge - machine dead

[Jon951]

Pavilion G6 laptop about 1.5 years old. 

My son had the laptop at college, and accidently plugged his roomates Bose speaker power block into the machine I'm referencing and was not able to power it or charge the battery. I'm an ex-Bell labs HW engineer, so here's the deal as far as I can report it:

1. Bose supply...18V DC output, 1.1 Amp, REVERSE POLARITY on output...Prob enough said.

2. No lights on machine when battery (had another charged battery), or correct HP power block plugged in (no surprise).

3. Pulled motherbord and have not identified fuse or protection diode which I may be able to replace if they even exist.

Here is mt question.....  Is there a fuse, diode, or common point of failure (device wise) when polarity into charging receptacle is applied? I'm ready to embark on a component level repair if I can identify the damaged devices, assuming I can get the parts.

From Motherboard, here is the info I was able to capture:

Model RS3

HP tag with barcode: 683029-501

Appreciate all input regarding this matter. Thanks!

[Jon951]

Whoops,

Mean't to say reversed polarity into charging receptacle is applied...in this sentence:

"Here is my question..... Is there a fuse, diode, or common point of failure (device wise) when polarity into charging receptacle is applied? I'm ready to embark on a component level repair if I can identify the damaged devices, assuming I can get the parts."

[Jon951]

.....Further note,

No smoke or sound detected when plug went into receptacle on laptop

[Huffer]

Yes the power jack is a modular device in recent years; no longer soldered to the motherboard. If all the stars were aligned just right the circuitry inside the pigtail was fried before it fried the rest of the motherboard. So you can start with replacing the power jack module, which just plugs into a receptacle on the motherboard. 

Here is the Service Manual:

Manual

This is the part you need:

(13) Power connector (includes cable) 682744-001

$11 on eBay:

http://www.ebay.com/itm/AC-DC-Power-Jack-Plug-Socket-Harness-FR-HP-PAVILION-dm4-3007xx-682744-001-66...

If this is "the Answer" please click "Accept as Solution" to help others find it. 

[Jon951]

Thanks Much...

Ordered the part on eBay. Always joke about my eyesight, that it depends on the phase of the moon and celestrial alignments which determine if I can see on a given day as I wake. I'm crossing my fingers on this one. It will surely make my day if just this module fried. For now, and until Thursday when delivered, I'm in a happy guy! At least I have a chance to get the machine up and running soon.

Take Care,

Jon

[Jon951]

One other thing....

How do I extract the old one living in the machine right now?

Thanks

[Huffer]

That is why I gave you the manual. If you got to the motherboard you must see where the power jack is on a cable that leads to a plug in on the motherboard. Just remove that like any other molex type connector and free up the power jack module. 

if this is "the Answer" please click "Accept as Solution" to help others find it. 

[Jon951]

Latest status:

Received replacement  AC/DC jack from guy on eBay. Installed and reassembled laptop. Plugged DC supply into receptacle and tried to boot machine. No response from pressing power button whatsoever.

I have similar machine which is functional and I notice the following:

When I plug the DC supply into the other machine, LED illunimates. When i plug DC supply into machine I'm attempting to repair, no LED illuminates. I'm talking about the LED contained within the replacement part itself (the charging receptacle I bought on eBay).

My question is: Is the replacement part defective, as should the LED illuminate whether the part was installed or not with the DC supply plugged in? Or is there circuitry on the motherboard which sends signal or voltage back to illuminate the LED?

Two final things: 1. Both machines mentioned in this post utilize the same charger with respect to voltage, polarity, and wattage.  2. Old power receptacle removed from machine's LED does not illuminate when in or out of machime with DC supply plugged in, but I suspect internal electronice were damaged when reverse polarity was applied per original post.

Thanks

[Jon951]

Seeking schematic for 683029-501 Motherboard. Is this available or am I dreaming to get ahold of this?

Installed new power receptacle and applied power....machine still dead. Suspect reversed polarity voltage made its way past plug receptacle electronics and took out something on the motherboard....hopefully diode or fuse.

On a personal mission to make a board level repair.

Thanks