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HP Recommended

I am going to put this out here and it would be great to get an answer, but I am not expecting one. In trying to help another member with their BIOS problem I ended up corrupting my own. I have tried using the same method that I used to rescue my HDX18, but it has gotten to the point where the machine won't even recognise the USB flash drive anymore.

 

 Here is a thread I found that sums up all the steps I have tried.

 

 http://forum.notebookreview.com/hp-compaq/479375-hp-pavillion-dv8-dv8-1090ev-usb-flash-drive-bios-re...

 

 There is also a link in there that talks about a white paper from HP to save the BIOS in a root directory on the USB flash drive, which is explained very poorly.

 

 http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01670688&lang=en&cc=us&taskI...

 

 So I have given up on all of the above and I have decided to resolder on a new preprogrammed chip, which is easier in the long run anyway.

 The problem is that there are two Winbond ( a BIOS chip manufacture) BIOS chips on the mother board, which one is the BIOS chip. It has been suggested that one is a controller for the keyboard.

 The one near the keyboard ZIF connector is 25X16AVSIG and the other on the other side of the MoBo near the optical drive connector is 25X40AVSIG.

  Which is the correct one to replace ?

 

 What I really need is for someone from HP to take a quick look at the schematic diagram for the MoBo and tell me which is which.

 

 

 25X16AVSIG.JPG

 

  25X40AVSIG.jpg

1 ACCEPTED SOLUTION

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HP Recommended

It's the one near the keyboard ZIF connector, the other is for Video BIOS.  :generic:

 

 http://forum.notebookreview.com/hp-pavilion-notebooks/426674-hp-dv8-owners-lounge-569.html

 

 Woods3336 in the link has a schematic diagram.  :Surprise:

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HP Recommended

It's the one near the keyboard ZIF connector, the other is for Video BIOS.  :generic:

 

 http://forum.notebookreview.com/hp-pavilion-notebooks/426674-hp-dv8-owners-lounge-569.html

 

 Woods3336 in the link has a schematic diagram.  :Surprise:

HP Recommended

image.jpegimage.jpeg

 

 

 

I am having a similar question.  I also would like to know if the included image is of the BIOS chip for the motherboard of a dv3000.  Here, I Include the model of the board in an additional photo.  I am sorry, but I can also provide the HSTNN number found on the reverse side of the board, if required.

HP Recommended

I recently re-soldered the socket for the RTC battery back onto the board.  It had broken off and the battery was soldered onto the board as shown in the following picture:

 

image.jpeg

 

 

Unless I am mistaken, the red lead should have connected to the solder pad directly adjacent left of where it can be seen in this picture, and the black to the pad where the red now is.

 

After finally re-soldering another socket into the place of the original and inserting the battery, the board would no longer start.  It is my assumption that the BIOS chip, (which, if memory serves correct, had failed following the earlier polarity reversal), is now - once again -  in need of having either its programming restored or having another functioning chip soldered into the board and take its place.

 

I would like an opinion from someone asking if my analysis of the situation sounds correct.

HP Recommended

The problem is that the replacement batteries being sold had their positive and negative leads wired into the socket-head reversed, and needed the wires needed to be cut and spliced back together.

 

Finding the ground on the board was done using a circuit tester.  

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