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From: D Yuniskis on 15 Feb 2010 12:49
Jstein wrote:
> On Feb 12, 12:44 pm, D Yuniskis <not.going.to...(a)seen.com> wrote:
>> Jstein wrote:
>> (sigh) Would have been nice if you had done some research
>> (there's this website called *Google*...) before posting.
>>
>> *Knowing* what *should* be on the screen, shine a flashlight
>> obliquely (so the reflection doesn't come straight back at
>> you) *into* the screen. If you can see the image that you
>> *expect* to be there, then your backlight(s) are not operating
>> (but the panel itself *is*).
>>
>> Then, use Google to see why that might be the case and what
>> you can likely *do* about it (assuming you have the
>> necessary skillset).
>
> I was able to shine a flashlight on the screen this weekend and their
> is in fact a picture so it would appear this is a back lighting issue.
> Because the screen turns on at full brightness for a split second,
> would this imply that the back light has completely failed (and needs
> to be replaced) or could there potentially be another issue affecting
> this ie power supply, component failure etc?

Look for bad caps on the primary to the inverter.
From: Jstein on 20 Feb 2010 22:09
On Feb 15, 12:49 pm, D Yuniskis <not.going.to...(a)seen.com> wrote:
> Jstein wrote:
> > On Feb 12, 12:44 pm, D Yuniskis <not.going.to...(a)seen.com> wrote:
> >> Jstein wrote:
> >> (sigh)  Would have been nice if you had done some research
> >> (there's this website called *Google*...) before posting.
>
> >> *Knowing* what *should* be on the screen, shine a flashlight
> >> obliquely (so the reflection doesn't come straight back at
> >> you) *into* the screen.  If you can see the image that you
> >> *expect* to be there, then your backlight(s) are not operating
> >> (but the panel itself *is*).
>
> >> Then, use Google to see why that might be the case and what
> >> you can likely *do* about it (assuming you have the
> >> necessary skillset).
>
> > I was able to shine a flashlight on the screen this weekend and their
> > is in fact a picture so it would appear this is a back lighting issue.
> > Because the screen turns on at full brightness for a split second,
> > would this imply that the back light has completely failed (and needs
> > to be replaced) or could there potentially be another issue affecting
> > this ie power supply, component failure etc?
>
> Look for bad caps on the primary to the inverter.

I was able to dive into this project the other night and did determine
that one of the surface mount fuses is open. I have uploaded an image
of the board here:

http://s443.photobucket.com/albums/qq154/steinj1/

The fuse that is open is labeled F2. The other surface mount fuse is
labeled F3 and appears to be fine. Can this fuse be replaced by an AGC
fuse ? Is it likely that this fuse failed on its own or there is
another underlying issue with the inverter board? My fear is that a
new fuse will fail immediately after the unit is powered up. Any
suggestions are greatly appreciated.
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