LC 630 dead

[oldmacs]

Hi all - 

I've just received an LC 630 and it seems completely dead - when its plugged in and switched on from either the keyboard or the switch it does nothing... 

Any ideas (like is there some trick with PRAM batteries or something?) 

 

[MJ313]

Do you know if it's an old PRAM battery? Could just be dead. Have you checked out the logic board at all?

 

[oldmacs]

Do you know if it's an old PRAM battery? Could just be dead. Have you checked out the logic board at all?

I've tried two different logic boards - one which supposedly is definitely working. 

There was no PRAM battery installed at all - I have a flat one. Is the battery essential for boot? 

 

[raoulduke]

"Symptom Charts/Video" - slide/pg. 8: (http://tim.id.au/laptops/apple/legacy/quadra.lc_630.performa_640.pdf)

Symptom: "Screen is completely dark, fan is not running and LED is not lit"

Resolution:

"1) Check all external power connections.

[the relevance of 2 in this case is: is the keyboard for sure good?]

3) Reseat logic board.

4) Unplug 4.5 battery, wait 20 seconds, plug in battery, and restart computer.

5) Verify that monitor has power.

6) Remove expansion card, if present.

7) Replace power supply.

8 ) Replace logic board.  Retain customer's SIMMs."

 

[Macdrone]

Also check pins where logic board slides in, like on the all in one LC's the pins can tweak and not contact like they are supposed to.

 

[68k family]

My performa 631 just dropped dead. Cause was the power supply. Picked one up on eBay for $18. Not bad. Geez... Between the logic board in my centris, monitor blowing on my 800 and now this I'm starting to feel like I own some classic cars.

 

[Macdrone]

Yep, caps in a twenty four year old power supply might start being an issue.

 

[uniserver]

Yeah these capacitors a big problem. If it's not the actual capacitor itself causing a main board or a power supply to not work, then it's the goo that leaks out and dribbles all over the place causing all kinds of beautiful side issues including electrolysis, pad rot, trace rot, via rot, I/c leg rot. And actual permanent irreversible damage to ICs form the conductive liquid, shortening various legs. Ic's including Ram chips, sound chips, EGRET, CUDA, even resistor packs and VLSI's .

 

[techknight]

Dont forget the lowely little monitors. they have issues too that need addressed before a catastrophic failure occurs. 

my 12" RGB blew out a string of components while trying to run it with distorted images shooting a video.