Question about Apple iMac G4 Desktop
There is no something like fuses in the board.your chip and processor both are ok dont worry about that.just remove the chips and processor.and get it checked from where you have got the chip.as many times this happens when we insert the new chip this problem occurs.for a period of time.and then it disappears.just get it checked.as the chips and the processor are not that sensetive to be damaged in simple fixing.check all the standing copper pins.are they proper.thanks.rate the solution.
Posted on Aug 24, 2008
This sounds like a problem with the second memory chip. Remove it, and see if the machine starts correctly. If so, then put the first chip in under the processor, and try the startup. If it starts, then put the second chip in. If it doesn't start, then I'm going to say that you got a bad chip. It's not that uncommon to get a bad chip straight out of the box. I seem to get about one in every forty, here at my shop.
Posted on Aug 24, 2008
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Posted on Jan 02, 2017
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Selection criteria for a new capacitor are: same capacitance (Greek letter mu and F, looks somewhat like uF), same or higher voltage rating, same or higher maximum temperature rating, highest available endurance at rated temperature, and highest available ripple current rating. A capacitor with too low a ripple current rating will probably burn out prematurely. Also, select for low ESR (Equivalent Series Resistance) or low impedance if you have two parts that are otherwise equivalent on the specs. Oh, and be sure you check the physical size - diameter and height in millimeters. It's embarrassing and costly to order a part, then find it won't fit the space on the circuit board, or it's too tall to put the cover back on over it. Replacing parts on a multi-layer logic circuit board is not a task for beginners. Power supplies are usually single layer and somewhat easier to work on.
If you don't see any bad capacitors, then try disconnecting both the hard drive and the optical drive. If one of these is the problem, your iMac will start with a single normal chime, then the screen will turn gray with a flashing question mark in the middle (it's asking, "Where's my startup disk?"). If it still doesn't act normal, then you probably have a bad logic board (I recommend measuring power supply voltages to verify those are good before buying a replacement board).
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