Plasma TV - any ideas on getting it working?

[[email protected]]

Hi!

I've been given a Vision PM 4230 Plasma (the procudt code also comes
back as Orion so I'm guessing this is just rebadged), which doesn't
work.

When power is inserted, the power button goes orange, and when pressed,
goes green. No display appears and a buzzing sound comes from the back
(although there is no burning or other smell at all).

I know that sounds pretty vague, but I was just wondering if anyone
would have any idea how easy/cost efficient this may be to repair? I'd
be willing to spend a reasonable amount, as obviously I'd have a cheap
large screen at the end of it.

Thanks a lot!

Danabnormal

 

[[email protected]]

Oh, just discovered something...

When you press the power button, nothing happens for about 5 seconds
(bootup). After this the buzzing happens. HOWEVER, the buzzing is at
two pitches and changes at ~2second interval. At the same time, if I
look down the back, theres a red LED that alters in intensity in time
with the buzz.

I'm assuming then that a startup 'test' has failed, and that this is an
indicator of the problem. I'll open the back up this weekend and see if
theres anything marked around the LED that can indicate the exact
issue.

Hope that may help anyone in the know - I'll also update this thread
just incase it comes in handy for anyone else out there on the
interweb.

Ta!

Danabnormal

 

[b]

[email protected] ha escrito:

Hi!

I've been given a Vision PM 4230 Plasma (the procudt code also comes
back as Orion so I'm guessing this is just rebadged), which doesn't
work.

When power is inserted, the power button goes orange, and when pressed,
goes green. No display appears and a buzzing sound comes from the back
(although there is no burning or other smell at all).

I know that sounds pretty vague, but I was just wondering if anyone
would have any idea how easy/cost efficient this may be to repair? I'd
be willing to spend a reasonable amount, as obviously I'd have a cheap
large screen at the end of it.

Thanks a lot!

Danabnormal

Sounds like the power supply has shut down due to a short or other
problem. This set will need proper troubleshooting. If you haven't the
relevant experience or tools, I strongly suggest you NOT try to do it
on the cheap and do not tamper with it. You could endanger your life
and mess it up beyond economical repair. A trained tech OTOH, after
removing the rear panel, will easily be able to identify this fault and
give you an idea of how much it will cost to proceed. I recommend you
TAKE it to a repair shop!
-B.

 

[[email protected]]

Heya.

Cheers for that - I fully intend to, but if I can save myself £80 for
someone to diagnose the fault and tell me its buggered, that'd be my
preferred option. I'm no electrician, and have no intention of
tinkering, but if I can find a model number inside (as I'm assuming
this is a 'generic' model) I can hopefully find a manual that'd tell me
exactly what that light means.

Cheers for the reply!

 

[tomh]

I'll hazard the guess that it's got a power supply that's failed,
probably a switcher. The buzzing noise(s) are the supply trying to get
going. The failure could be the power supply itself, they do that - just
crap out for no reason, well bad caps, failed component, etc, or the
supply is not starting because of a fault in the rest of the circuitry.
Finding tech docs for this could be problematic. It's probably from
China and having been rebadged makes it trickier. If you can find out
where it was originally purchased the store may have some info or an
"authorized" repair depot. Although a lot of them won't sell or give
info to the general public. Here in the states even companies that used
to be real good about making service literature available are dropping
that business.
A good tech may be able to ascertain the problem even without docs and
fix a power supply as long as it isn't a unidentifiable/unavailable
part. If the problem is part of the main circuitry - you may be hosed.
That kind of good tech won't come cheap, but won't be a rip off either.
Good luck.

tomh

 

[James Sweet]

Hi!

I've been given a Vision PM 4230 Plasma (the procudt code also comes
back as Orion so I'm guessing this is just rebadged), which doesn't
work.

When power is inserted, the power button goes orange, and when pressed,
goes green. No display appears and a buzzing sound comes from the back
(although there is no burning or other smell at all).

I know that sounds pretty vague, but I was just wondering if anyone
would have any idea how easy/cost efficient this may be to repair? I'd
be willing to spend a reasonable amount, as obviously I'd have a cheap
large screen at the end of it.

Thanks a lot!

Danabnormal

To start with, open it up and see if there's craters in any of the big
chips bonded to the panel, if that's the case (as was with the Sony I
looked at once) then it's not worth working on.

 

[[email protected]]

Hiya guys.

Cheers for all the replies so far - thought I'd drop you an update.

I have opened up the back of the unit, and theres no markings or
obvious signs of blowout on any chip, board, or component.

The light I refer to above appears to be part of 5 lights that look
like they're there for diag purposes - once the power button is
pressed, all light up, and then turn off one by one barring this one,
which then begins to flash.

On closer inspection, the buzzing sound I mentioned seems to be coming
from the screen as apposed to any one component (this is a guess - but
I have been unable to pinpoint a source of the sound, it appears to
come from the entire surface area once the back is open).

I'm thinking this is not the PSU that has blown - on pressing the power
button the light on the power switch goes green, and you also get that
familiar 'click' from the PSU, followed by a bootup pause, followed by
this LED and buzz. I'm gonna open it again and try to take some pics of
the boards and model numbers.

Thanks!

Dan