Question about Sony VAIO VGN-A150 Notebook

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VAIO VGN-A150 motherboard

Hi VAIO experts,
After Sony replaced the motherboard twice for a display problem (meshed lines, green/red), the same problem returned last June. At first, the lines would go away if I applied pressure at a certain spot on the back. This only worked temporarily. Over school break, I discovered that just under the
bottom panel (which covers the memory chips), next to the screw hole, is what looks like a support post against the board. Directly underneath this post, a resistor labeled R1209 is now missing, and at closer look I noticed the fractures in the solder; it's apparent that the support post eventually broke off the resistor part. This post is obviously in a wrong place. I've emailed Sony about this, but they want me to send the laptop in and pay for another replacement.
I would really appreciate it if you tell me the value of R1209. I'd like to solder in a replacement resistor to see if I can fix the display. If it does, I will cut off the stupid post.
You would have to open up the memory access door at the center of the back panel and pop up the memory card, unless you happen to have a parts list or a motherboard on hand. Please help me.

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That would be verry difficult to find. A service diagram of this model is imposible to be found, at least over the internet. However here are some tips you may find usefull. If you have acces to a multimeter or at least a current-voltage measuring device, try to turn on the laptop and measure the voltage on those pins where the resistor is missing. If you find something smaller then 10 volts you can try the following method.
Buy a 1 mega ohm resistor along with other smaller values like 100kilo ohm, 10kilo ohm, 1 kilo ohm, 100ohms, 10 ohms. These resistors don't need to be smd tipe, regular ones are good at least for this testing stage as long as you can solder them on the motherboard. Begin by using the larger values (1 mega ohm) and check to see if the problem is solved or something is different. Then decrease step by step checking each time how the problem evolves. When you reach to 1 kilo ohm, don't solder the resistence like before, instead mount an amper-meter in series (not parralel !!! ) with the resistor. Check to see how much current is passing through the resistor. If you find more then 100mA stop here, because by following this metod down to smaller values of that resistor you may damage the board if the current exceeds certain levels.
Try this simple tests and please notify my of the results. You may ask further questions if you need more details on this matter.

Posted on Jan 21, 2008


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