User manual SONY VAIO VGN-FW590

[. . . ] 4 Important notice for replacing a system board . 4 Strategy for replacing FRUs for CTO, CMV, and GAV 4 Product definition . 4 FRU identification for CTO, CMV, and GAV products . 5 Important information about replacing RoHS compliant FRUs . [. . . ] verify a symptom, do the following: Turn off the computer. Check that power is supplied when you turn on the computer. Disconnect the ac adapter and install the charged battery pack. Check that the battery pack supplies power when you turn on the computer. If you suspect a power problem, see the appropriate one of the following power supply checkouts: v "Checking the ac adapter" on page 31 v "Checking operational charging" on page 31 v "Checking the battery pack" on page 31 v "Checking the backup battery" on page 32 30 MT 8747, 8749, 9440, 9441, 9442, 9443, and 9448 Checkout guide Checking the ac adapter You are here because the computer fails only when the ac adapter is used. v If the power problem occurs only when the port replicator is used, replace the port replicator. v If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity and installation. v If the computer does not charge during operation, go to Checking operational charging. To check the ac adapter, do the following: 1. Unplug the ac adapter cable from the computer. Measure the output voltage at the plug of the ac adapter cable. See the following figure: Pin 1 Voltage (V dc) +20 0 Ground 3 2 1 (20V) 2 3 Note: Output voltage of pin no. 2 of the ac adapter may different from the one you are servicing. Power off the computer, and unplug the ac adapter from it. Remove the battery pack (see "1010 Battery pack" on page 56). Remove the backup battery (see "1110 Backup battery" on page 76). Measure the voltage of the backup battery. See the following figure. Red (+) Wire Red Voltage (V dc) +2. 5 to +3. 2 Ground Black (-) Black v If the voltage is correct, replace the system board. v If the voltage is not correct, replace the backup battery. v If the backup battery discharges quickly after replacement, replace the system board. 32 MT 8747, 8749, 9440, 9441, 9442, 9443, and 9448 ThinkPad Z61t Product overview . Restoring the serial number of the system unit Retaining the UUID . Reading or writing the ECA information . 1030 Hard disk drive cover, hard disk drive, and hard disk drive rubber rails . 1040 Palm rest or palm rest with fingerprint reader . [. . . ] Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user's responsibility to evaluate and verify the operation of any other product, program, or service. Lenovo may have patents or pending patent applications covering subject matter described in this document. [. . . ]