Toshiba 42HP66 plasma TV Firmware update

A

Andy Cuffe

Guest
I have a Toshiba 42HP66 plasma TV with random moving red speckles all
over any dark areas of the picture. Other than the speckles, the
panel is in like new condition, so I'd like to repair it if possible.
I've already confirmed that the power supply voltages are correct, and
checked for obvious problems like bad caps.

It uses an LG PDP42X32000 plasma panel, and this seems to be a common
problem with LG panels. It is possible to reduce the speckles by
readjusting the drive voltages, but I would rather fix it properly.
I've read several posts on various discussion forums that say it can
be fixed with a firmware update (I'm not sure if it's the TV, or the
panel that needs the update). The TV can be updated via a USB stick
according to the service manual, but Toshiba doesn't make these
updates public.

Can anyone help me find a copy of the update? Even is a special
service jig is needed to update the panel, I can probably figure
something out if I had the file. I can always pull the EEPROM and use
my programmer if I have to.
 
Obviously, company policies vary, but why wouldn't a firmware update be
publicly available? Pioneer puts theirs on the Web and invites owners to
perform their own updates.
 
On Sat, 6 Aug 2011 07:55:54 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

Obviously, company policies vary, but why wouldn't a firmware update be
publicly available? Pioneer puts theirs on the Web and invites owners to
perform their own updates.
Click to expand...
It's possible that they don't want the end user installing the update
for some reason (like risk of damaging the TV if it's done
incorrectly, or adjustments needed after the update). The post I'm
referring to mentions the use of an update jig, which implies they are
reprogramming the ROM on one of the boards, which obviously wouldn't
be accessible to the user. I've already sent a message to the person
who wrote this post, but I haven't heard back yet.


Here's a post that mentions the update:

"LG has a fix for this problem known to them by the term 'Mal
Discharge' (sounds kind of gross but it is a term for the incorrect
firing of pixels). An authorized LG service center will have access to
a jig that upgrades the control board. I have used this jig many times
on the 42PC1D and the 42PC3D as well as some Toshiba plasmas that were
LG's in disguise. Adjusting the Vs, Va, VsetUp, and VsetDn out of spec
may temporarily fix the problem but is not good for the panel or the
drive boards. Before the tech can use the jig, he or she will have to
re-align the panel according to factory specs (some of which are
located on a sticker on the panel)."
 
On Sat, 6 Aug 2011 07:55:54 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

Obviously, company policies vary, but why wouldn't a firmware update be
publicly available? Pioneer puts theirs on the Web and invites owners to
perform their own updates.
Click to expand...


Another post about an update to the control board:


"This problem is called mal-discharge.

To "fix" you will either need a new control board (which comes from LG
with new firmware) or have the firmware updated on your old control
board. Depending on panel there maybe slight voltage adjustments
required also. Updating the control board requires a special jig most
LG shops should have one.

Making adjustments on the y-sus will only mask the problem for
awhile."
 
Toshiba Canada offers firmware, but I don't know if they have any for
your model:

http://support.toshiba.ca/support/ceg/downloads/index.asp
 
On Sat, 6 Aug 2011 19:16:59 -0700 (PDT), "larry moe 'n curly"
<larrymoencurly@my-deja.com> wrote:

Toshiba Canada offers firmware, but I don't know if they have any for
your model:

http://support.toshiba.ca/support/ceg/downloads/index.asp
Click to expand...
Unfortunately, there's nothing for my model. There is firmware on the
US site for some TVs, but not this one. They don't even acknowledge
that they ever sold a plasma TV in their support section.

This is the board that needs the update:

http://www.shopjimmy.com/tvs/lg-6871qch077c-main-logic-ctrl-board.htm

It's definitely not something that can be done by the customer since
it requires connecting a cable to an update port on the board. I'm
almost tempted to buy this replacement board, but I have no way to be
sure it has the updated firmware.

Someone here must have access to the update? Is there a service
bulletin for any of those brands listed?
 
Andy Cuffe <acuffe@gmail.com> wrote in message
news:ljdt37p90heh6t4j4g3pnokj2do85s07ea@4ax.com...
On Sat, 6 Aug 2011 19:16:59 -0700 (PDT), "larry moe 'n curly"
larrymoencurly@my-deja.com> wrote:

Toshiba Canada offers firmware, but I don't know if they have any for
your model:

http://support.toshiba.ca/support/ceg/downloads/index.asp

Unfortunately, there's nothing for my model. There is firmware on the
US site for some TVs, but not this one. They don't even acknowledge
that they ever sold a plasma TV in their support section.

This is the board that needs the update:

http://www.shopjimmy.com/tvs/lg-6871qch077c-main-logic-ctrl-board.htm

It's definitely not something that can be done by the customer since
it requires connecting a cable to an update port on the board. I'm
almost tempted to buy this replacement board, but I have no way to be
sure it has the updated firmware.

Someone here must have access to the update? Is there a service
bulletin for any of those brands listed?
Click to expand...

elektrotanya small SUM pdf has some data info
 
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