Sony Vaio PCG-F807K/F808K/F809K

• Intel Pentium III Mobile
  • 650MHz - F807K
  • 750MHz - F808K
  • 850MHz - F809K
• 256MB (maximum) PC100 SO-DIMM (2x slots)
  • 64MB (standard) - F807K
  • 128MB (standard) - F808K/F809K
• ATI Rage Mobility M1 8MB
  • 14“ 1024×768 TFT screen - F807K
  • 15” 1024×768 TFT screen - F808K
  • 15“ 1400×1050 TFT screen - F809K
• Yamaha YMF-744 audio (OPL3, SB Pro 2.0, XG MIDI - Windows only)
• 2x PCMCIA / Cardbus
• Headphone out, Microphone in (no Line-in)
• Stereo speakers
• Onboard FDD + DVD

These models are also referred to as PCG-9326, PCG-9336 and PCG-9316.

• Sony PCG-F807/808/809K User Manual

It appears that all Sony Vaio PCG-Fxxx series laptops share a similar construction, and the same BIOS/CMOS battery. It is tucked under the wrist rest at the front of the machine, just in front of the FDD bay, and to the right of a power controller board / laptop lid sensor board.

Unfortunately all of these batteries are Ni-Mh cells and they all leak.

On severe cases the leaking cells can cause severe corrosion to the case, FDD, power board and lid sensor, rendering all of them inoperable.

Please replace these batteries as soon as possible. They are present on virtually all Sony Vaio PCG-Fxxx models, and likely others, too.

Somewhat related to the leaking batteries, but also an independent issue even for laptops with no battery leakage, is the power sub-board.

This board is at the front of the case, central between the left side battery bay and the right side FDD bay, under the front of the keyboard/wrist rest. It interfaces with both battery modules (the standard left hand bay, and the optional extra battery in the FDD bay) as well as the main power from the 19.5V DC jack on the rear of the machine.

The laptop will not operate without this small board, even if you do not use the laptop battery pack!

Unfortunately, there seems to be some inherent problem with this board where it dies due to age or use, as well as being damaged by battery leakage. In two seperate examples I found the power board had no additional damage from battery leakage other than slight discolouration of the two pins for the CMOS battery header. No visible corrosion anywhere else, no damaged traces, no broken components. Yet neither board would allow the laptop to power on.

A third board, from a known-working (PCG-F807K) laptop was transplanted in (to a PCG-F809K), and despite looking identical, with the same level of minor battery damage to the CMOS battery header pins, actually allowed the second machine to work.

So, two possible failure modes for this power board:

• Failure due to corrosion from CMOS battery leakage
• Failure from some unknown component on the board which is not related to battery leakage and therefore not visible

Therefore, the only sure way to get a replacement power board, or to restore a faulty PCG-Fxxx machine is to remove the power board from a known-working machine. Unfortunately, without a solid diagnosis of the underlying issue, it is possible that other known working machines/power board may also fail in the future, irrespective of CMOS battery leakage.

Note: In addition, the laptop lid sensor board at the front of the power board can be damaged by battery leakage.