Hi Xiongnu;
Since you have given us additional information, I feel I should add to
my reply, and also, like Jumpster Jiver, give you a warning.

Looking for a fuse door or other things OUTSIDE the unit is always okay
to do.

Poking around inside with screwdrivers is NOT okay to do, until you
understand how to avoid exposure to electricity.

Units that are like yours, may not have fuses or other kinds of
protection that are easy for a user to replace. They build the unit
with the ability to withstand NORMAL problems, but should the unit have
a big problem, the makers want you to take it to a professional, for
proper repair, and also for your safety and so they cannot be accused
of giving you a dangerous environment to poke around in.

The unit may have a fuse inside, but you probably also see a warning on
the back that says "No User-Serviceable Parts Inside", and possibly the
words "Risk of Shock or Electrocution". That means that there will be
parts in there that are exposed to your touch, and if you have the unit
plugged in while you do that, you might get hurt.

So, Xiongnu, you have told us that this happened after a thunderstorm.
No unit can be designed to withstand all the possible outcomes of a
nearby lightning strike.

A fuse is designed to protect against a malfunction that would cause
the circuitry to heat up and maybe cause a wiring fire. But a fuse is
NOT designed to protect a device from the very fast snap-pop actions of
a lightning bolt nearby. Even if the fuse inside is burnt and you
replace it, there will be no guarantee that other components have not
been messed up.

I would recommend that, if you like this stereo and you want it to work
again, take it to a repair shop.

If you want to learn repair, maybe this unit is the one you want to
experiment with, but do not open inside it or work on its insides with
the unit still plugged in to the wall. And read about how you can
protect yourself from shocks. There is a way to keep safe, but you
cannot be "casual" around electricity.

Okay?