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

[Brad]

Hi,

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

 

[Jack]

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.

JMK

 

[Supertech]

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.

 

[Adrian C]

You wont ever find a schematic for a laptop.

Nah, never say never, one day someone will find one ...

Unfortunately not the OP's one ;-(

Mitac 7321
<http://drivers.getac.com/Commercial(PBU)/7321/7321-sm.pdf>