Apple LC 475 screen white w/ cursor

[MacTech68]

Very odd indeed - unless I'm missing a step. Was the machine 'warm' when it finally decided to boot up?

Otherwise I'm going with an intermittent fault.

I've seen flat PRAM batteries cause no startup on the LC475, PPC 6100, PM 4400 (7220 in A/Pac), but NEVER a POST error chime. But, I'm happy to be proven wrong.

I've read USA forum posters mention the recycling depots many times and I cringe since we have nothing of the sort here (at least, not the apparent plethora of them). Jealous? You bet !

The power supply switch is (thankfully) a fairly standard size. Getting the old one out and the new one in can be difficult depending on which manufacturer's power supply it is - from memory there is Delta, TDK, Dyna Comp. Or, you can solder the wires together:

WARNING, some of the power supplies used a two pole switch (IE, FOUR wires at the switch) - if you cross the wires on these, you'll blow a fuse in your house VERY dramatically or even yourself. IIRC, most of them are soldered, and too much heat can melt the back of the switch. Be careful. Joined wires (bypassing the switch) need to be soldered, no twisted together, and insulated appropriately.

As for upgrades, CPU upgrades for these are pretty pricey now. RAM will be fine, and you'll only get a 10BaseT PDS Ethernet card - no faster.

 

[ApplemanY]

Stiction etc

Hiya

Two days on and several things are clearer.

Two days on the radiator did nothing for the Int HDD! It isnt turning!

The External SCSI HDD is running and if I had the screen working I suspect it would be seen to be there.

However I now have the LC475 booting without additional musical chords everytime

Removing the RAM and putting it back seems to have sorted something. The VRAM is in at an odd angle and iuts not held very securely. How should it be?

The temporary (almost out of power) battery is apparently why the screen isnt displaying. New one should be here tomorrow.

I'm not sure why the floppy isnt booting.. could that be a PRAM matter too? It worked that once or twice when the screen worked too. I now know I need to use the Disk Utilities floppy to boot with.

I am not using the power supply switch. Its permanently on and I turn it on and off at the power point switch.

Can I do anything else with the HDD?

Colin

 

[MacTech68]

Removing the RAM and putting it back seems to have sorted something. The VRAM is in at an odd angle and iuts not held very securely. How should it be?

The two VRAM SIMMs should be perpendicular to the logicboard. The single 72PIN RAM SIMM should be at an angle - see exemplar here (with thanks to Damian)

https://www.flickr.com/photos/damianward/sets/72157625813807999/?view=md

The temporary (almost out of power) battery is apparently why the screen isnt displaying. New one should be here tomorrow.

I'm not sure why the floppy isnt booting.. could that be a PRAM matter too?

Remove the battery, disconnect the power, and short the battery socket terminals for about 15 mins. Remove the short, DO NOT REFIT BATTERY, power on. See what that does.

Can I do anything else with the HDD?

Yes and no. Have a close listen to it when you first apply power - it might spin up for about 5 seconds then spin down - you need to be quick to hear it. Report back what you hear.

 

[goMac]

Back in the day, I had an LC 475 do the exact same thing, and all it needed was a new PRAM battery.

 

[ApplemanY]

The two VRAM SIMMs should be perpendicular to the logicboard. The single 72PIN RAM SIMM should be at an angle - see exemplar here (with thanks to Damian)

https://www.flickr.com/photos/damianward/sets/72157625813807999/?view=md


Remove the battery, disconnect the power, and short the battery socket terminals for about 15 mins. Remove the short, DO NOT REFIT BATTERY, power on. See what that does.



Yes and no. Have a close listen to it when you first apply power - it might spin up for about 5 seconds then spin down - you need to be quick to hear it. Report back what you hear.

No different, sorry to say. The HDD didn't, so far as I could hear move. The floppy didn't evidently move. The Display didn't display. The external drive which was already running didn't react.

Its morning now and the post should deliver the battery with luck sometime today.

Meantime I have the PB 1400 linked to the router as is the working Pismo. The Pismo has opened all 3 of the CDs for 7.5, 8.1 and 9. The PB cannot open the floppy drive - it doesnt move at all. The CD drive light flutters when I boot the PB but nothing appears on screen and neither of the CD boot key commands make any difference. I removed all the Controlpanels and Exts except the few relative to the CD and rebooted. I have tried the 15 second reset followed by boot. No difference. The PB does boot on its HDD. I think I was wrong in uprating to 9.1 and now wonder what I can do to reinstall an earlier OS. I was hoping that the Pismo running 10.4.11 updated might offer a means but I am not sure how to. The installed old version of Disk Utility on the PB doesnt offer a delete option. Another little problem for later....!

Colin