3 volts from dual lith. hard wired batteries on handle assy. appears at connector on vc board. sony dosent supply schematics for the vc board. i am a c.c. tech w/many years experiance but i can not follow the trace. if any of you guys have a clue or knowledge about this problem,a assist wold be greatly appriciated.
Manny
[email protected]
Power-on LED illuminates when power button is pressed, fans spin, and boot tone chimes, but there is no video
1. Reseat video card. (Make sure video card is fully inserted in connector and end of card is secured by the connector latch.)
2. Reset PRAM (restart computer while holding down Command-Option-P-R keys until second boot tone chimes)
3. Replace video card
4. Reset logic board. Refer to "Resetting the PMU on the Logic Board" in this chapter.
5. Replace logic board
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Resetting the PMU on the Logic Board
The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for this computer. The PMU is a computer within a computer. Its function is to:
tell the computer to turn on, turn off, sleep, wake, idle, etc.
manage system resets from various commands.
maintain parameter RAM (PRAM).
manage the real-time clock.
Important: Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes and is not reset, the battery life goes from about five years to about two days.
1. Disconnect the power cord and check the battery in the battery holder. The battery should read 3.3 to 3.7 volts. If the battery is bad, replace it, wait ten seconds, and then proceed to step 2. If the battery is good, go directly to step 2.
2. Press the PMU reset button once and then proceed to step 3. Do not press the PMU reset button a second time because it could crash the PMU chip.
3. Wait ten seconds before connecting the power cord and powering on the computer. If the computer does not power on, there is something else wrong with it; refer to the "Startup Failures" section of "Symptom Charts" in this chapter.
Note: The above procedure resets the computer's PRAM. After resetting the PMU, be sure to reset the time, date, and other system parameter settings.
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