The fuse on the LCD inverter in most cases is placed close to the
input socket. So if this fuse blows, does it indicate that the input
voltage (and hence the motherboard) is at fault or the components on
the inverter (after the fuse) are to blame?

I am puzzled. A few folks I have asked tell me that the mobo is rarely
to blame for the blown fuse, and yet the location of the fuse seems to
suggest that it is there to protect the rest of the components on the
inverter. Any bright comments?

IF there is a fuse (not always), and IF it blows .... the only
indication you will get is that the screen will be dark.

If the fuse blows, it is almost always an indication that some other
part on the inverter circuit board has failed. It purpose is to protect
the laptop from the consequences of a failed inverter. It is not there
to save the inverter, which is presumed to be a throw-away part that
will simply be replaced and not repaired if anything on it fails.



htnakirs******.com wrote:
> The fuse on the LCD inverter in most cases is placed close to the
> input socket. So if this fuse blows, does it indicate that the input
> voltage (and hence the motherboard) is at fault or the components on
> the inverter (after the fuse) are to blame?
>
> I am puzzled. A few folks I have asked tell me that the mobo is rarely
> to blame for the blown fuse, and yet the location of the fuse seems to
> suggest that it is there to protect the rest of the components on the
> inverter. Any bright comments?

"htnakirs******.com" <htnakirs******.com> wrote in news:7a58bf7a-7442-4768-
8c4d-e45003029347@13g2000prl.googlegroups.com:

> The fuse on the LCD inverter in most cases is placed close to the
> input socket. So if this fuse blows, does it indicate that the input
> voltage (and hence the motherboard) is at fault or the components on
> the inverter (after the fuse) are to blame?
>
> I am puzzled. A few folks I have asked tell me that the mobo is rarely
> to blame for the blown fuse, and yet the location of the fuse seems to
> suggest that it is there to protect the rest of the components on the
> inverter. Any bright comments?
>

On any inverter or switching power supply, almost invariably, blowing fuses
is caused by shorted power switching transistors (which may also be
MOSFETs). Sometimes, many times, these shorted transistors take out the
driving IC, too.

If you swap the fuse and it blows....just get another inverter as they're
cheap and a PITA to fix.

--
Larry

http://flightaware.com/analysis/allflights_movie.rvt
Each tiny red dot is an airliner in this Quicktime movie, ONE recent day of
air travel in the USA. What would happen if "they" found out this was the
real source of air pollution or cancer or why all the bugs around my
streetlight have disappeared? Would "they" tell us? Would "they" STOP
IT?!