|
|
|
|
| Welcome, Guest | Home | Search | Login | Register | |
| Author | LC 475 without Battery (Read 99966 times) | ||||||||||||||||||||||||||||||
|
68kmac
32 MB  Posts: 51 System 7 Newcomer! 
|
on: August 04, 2025, 17:43
Maybe someone can verify this. It's said that an LC475 can't start without/with a dead battery. Mine has a dead battery. I didn't notice at first. I turned it on and then left the room. When I came back, the screen was still black. I don't want to subject the computer to the quick power-on/off trick. But: The LC didn't respond to a reset. So I unplugged and reconnected the monitor. After a few seconds, the LC restarted and displayed a screen. I repeated this again. Turned it on, waited a moment, unplugged and reconnected the monitor, and the computer restarted itself normally. Only the date and time are wrong. Is this a coincidence or intentional? |
||||||||||||||||||||||||||||||
|
lauland
|
512 MB Posts: 674 Symtes 7 Mewconer!
Reply #1 on: August 05, 2025, 15:41
|
Many (most? all?) models will start up with random contents in the pram if they don't have a battery and have been left unplugged. This will cause them to do what you describe sometimes. Not surprising since this includes the device they should start from. Usually resetting the pram (holding down command-option-power until you hear the boot tone) will solve this easily. The apocryphal way is to do it three times in a row to "really reset" it. (Don't know if that is just voodoo). The machine will be fine and preserve the pram contents until it is left unplugged again. With that said, I've had trouble with my LC 475 where this doesn't always work, and sometimes I will have to flip it off and on again, sometimes twice to get it to start. I've always assumed this might mean my caps are going bad, and it either takes time for them to get a charge, or the flipping on and off again "shocks" them to get one. So it may or may not be true that LC 475's really prefer to have batteries? I've seen what you've seen, and don't know exactly why.
|
cballero
|
1024 MB Posts: 1179 System 7, today and forever
Reply #2 on: August 05, 2025, 17:19
|
Oh boy; all of our Macs are indeed aging faster than we'd like them to! I, too, have a similar thing going on with a G5 iMac—it boots just fine, and for as long as it starts off cool (I think?) it stays on, but after a few minutes it just shuts down completely, but I think in my case it may either be dust collected on the boards inside or maybe it's a failing psu, but its bottom screws are rusted in place and the Phillips heads are worn so just getting into the Mac to verify and fix it will prove to be a very tough job in itself 
|
Cashed
|
128 MB Posts: 192 System 7 Newcomer!
Reply #3 on: August 05, 2025, 18:02
|
@cb Order ARCTIC MX-4 thermal paste. You got to get it opened, and get the CPU cooled asap. My G5 iMac runs extremely hot! Even though I cleaned and re-pasted. Had an epiphany idea, a few years ago -modding project in store.
|
wove
|
1024 MB Posts: 1363
Reply #4 on: August 05, 2025, 18:47
|
Funny how forum topics morph about as posts accumulate. Not talking here about the LC475. The G5 does run hot for sure. Its major weakness however is that the ceramic substrate is a fragile ceramic prone to crack with rapid temperatures. The reason for the massive heat sinks is to control the rate of temperature change preventing the substrate from cracking. Like most processors it should shut down if too hot. A G5 iMac will also shut down if the power supply gets too hot and it does collect dust and lint quickly. Massive amounts of compressed air is your friend on the power supply. From what I recall the screws on the bottom of the G5 iMac are not really screws in the sense that you take them out. They function as a lock and small lever and only turn about a half turn. You turn them a bit which unlocks the panel and another quarter turn will lift the screen allowing you to get a spudger in to start prying the front display off.
|
Bolkonskij
|
Administrator 1024 MB  Posts: 2023
Reply #5 on: August 06, 2025, 12:42
|
68kmac, odd discovery about your LC 475. I haven't had this happen / seen it myself. I always went with the quick on/off trick if needed but usually I simply replace the battery which is super easy on most desktop Macs. Because I don't like empty batteries, I once ordered a pack of 12 of these batteries and am still using them up  As for the iMac G5 - young Bolkonskij bought one new with the few cash he made as an army conscript. Even back then those things were running hot and I had heat issues like freezing when playing 3D games. Which is a pity because I still love the style, but ultimately I think they weren't built to last with a G5 in that small case, with the caps used ... glad I got rid of mine in time! (though part of me still misses it ... a System 7.6 Mac in an iMac G5 case with the respective TFT monitor would be a dream  )
Last Edit: August 06, 2025, 12:49 by Bolkonskij
|
cballero
|
1024 MB Posts: 1179 System 7, today and forever
Reply #6 on: August 06, 2025, 14:22
|
Most definitely agreed! Running natively, a G5 mod like that would really have rocked!  but even having the last Classic OS on it would have more than been enough for me!
|
ovalking
|
128 MB Posts: 199
Reply #7 on: August 06, 2025, 15:43
|
My 475 has a real appetite for batteries, so familiar with the no display issue. Not tried the monitor reconnect method. Wonder if the monitor type is important. My Apple 14" monitor won't normally work if connected after boot-up.p
|
|
Pages: [1]
|
| ||||||||
|
© 2021 System7Today.com. |
