Michael Kennedy wrote:
I recently got a Sharp Aquos LC20E1-S LCD TV. The problem is it didn't come
with a power brick.

The unit runs on 13VDC and uses 54W.. I managed to find a picture of the
power brick for this TV and it has 3 seperate 13V connections to the board
inside. I have checked the board with an ohm meter and they are completely
seperated inside. One power wire goes to the audio amp, one to the tuner /
lcd control board and one to the backlight inverter. I'm not really sure for
the reason of seperating them, but I assume that it is for interference
reasons and that the TV should power up if given 13V to all of those points
even if from the same source.

I rescued a similar set. The three supplies are, in fact,
separate (common return). I didn't bother to sort out "why"
as the set I have came with the brick. But, the schematic shows
them as separate.

Some possible reasons:
- keep the backlight supply isolated from the signal processing
supply (keeps audio/video cleaner)
- make sure the "processor" power supply comes up before other
supplies
- allow the processor to run even if the other supply(ies) die
(so it can blink an error indicator)
- etc.

Anyhow I have tried powering it by tying all of the 13V+ togeather and
giving them 13V and I get nothing except for a small noise from the speakers
and a light very briefly turns on. Just enough to see it.

I'm not sure I would have arbitrarily tied all of the supplies together.
There might be some power sequencing issues that your "patch" could
make problematic. Of course, its too late *now*... :

Does anyone have any expirenence with this TV? I have a friend with the same
tv.. Maybe I can borrow their AC adapter and try it on this one.

That's the *first* thing I would have tried (realizing that you
*could* possibly toast their brick in the process -- so hope it
is an understanding friend! : )