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UPDATE: Dead Compaq Armada 4210T Laptop (more details)



Jan 1, 1970

Part of the internal DC-DC inverter (SMPS) is not "running" which I assume
powers the drives (HDD and floppy), etc. There are three transformers and
using a scope with a pickup loop, one of the three transformers is not
"switching" with laptop turned "on".

Note: LEDs that are on, cannot be turned off using their related key (eg.
Caps Lock). See details in my previous post below.

I have searched everywhere for a schematic. I have the "service manual"
(.PDF file) for this model, but it doesn't have schematics.

I tested (in circuit) the parts in the internal DC-DC inverter and I have
not found a defective part. Checked all solder joints. It is possible that
an outside "control" that normally activates the SMPS is not functioning.

Does anyone know where I can get a schematic for this or a similar
model laptop?

Thanks in advance, Brad


Jan 1, 1970
I have been repairing notebooks for about 7-8 yrs. now and I have not seen
one schematic anywhere, for any notebook.
All you can go by is feeling your way around and trying to figure it out.



Jan 1, 1970
You wont ever find a schematic for a laptop. The best you can hope for
is a "Service Manual" which basically tells you how to take it apart
and where the screws are. Your fault is unlikely to be a power supply
fault, more likely to be the main CPU or the BIOS. Suggest you try
Google for info on these items. I wont bother going into great detail,
but these items are easily corrupted/damaged by static.
Good luck.