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My TV has started 'posterizing'



 
 
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  #1  
Old May 21st 17, 09:27 PM posted to uk.tech.digital-tv
Roger Mills[_2_]
external usenet poster
 
Posts: 268
Default My TV has started 'posterizing'

I have a Philips 37" flat screen HD-ready TV which is about 10 or 11
years old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather
than the set itself - but when I replay old footage from my Android
tablet (which was ok at the time it was recorded) into the other HDMI
port, the problem is present on that too - so it's almost certainly the set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.
  #2  
Old May 21st 17, 09:32 PM posted to uk.tech.digital-tv
Graham.[_12_]
external usenet poster
 
Posts: 385
Default My TV has started 'posterizing'

On Sun, 21 May 2017 22:27:00 +0100, Roger Mills
wrote:

I have a Philips 37" flat screen HD-ready TV which is about 10 or 11
years old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather
than the set itself - but when I replay old footage from my Android
tablet (which was ok at the time it was recorded) into the other HDMI
port, the problem is present on that too - so it's almost certainly the set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


My first port of call would be to go through the menus and switch off
all picture "enhancements". Perhaps you've has a house guest who was
board, and you weren't looking.


--

Graham.
%Profound_observation%
  #3  
Old May 21st 17, 09:34 PM posted to uk.tech.digital-tv
Graham.[_12_]
external usenet poster
 
Posts: 385
Default My TV has started 'posterizing'

On Sun, 21 May 2017 22:32:34 +0100, Graham.
wrote:

On Sun, 21 May 2017 22:27:00 +0100, Roger Mills
wrote:

I have a Philips 37" flat screen HD-ready TV which is about 10 or 11
years old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather
than the set itself - but when I replay old footage from my Android
tablet (which was ok at the time it was recorded) into the other HDMI
port, the problem is present on that too - so it's almost certainly the set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


My first port of call would be to go through the menus and switch off
all picture "enhancements". Perhaps you've has a house guest who was
board, and you weren't looking.


Sorry that's had not has.
And bored not board.

--

Graham.
%Profound_observation%
  #4  
Old May 21st 17, 09:39 PM posted to uk.tech.digital-tv
PLC
external usenet poster
 
Posts: 16
Default My TV has started 'posterizing'

On 21/05/2017 22:27, Roger Mills wrote:
I have a Philips 37" flat screen HD-ready TV which is about 10 or 11
years old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather
than the set itself - but when I replay old footage from my Android
tablet (which was ok at the time it was recorded) into the other HDMI
port, the problem is present on that too - so it's almost certainly the
set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


After ten years it is beyond economic repair. Buy a true HD one not a
cheapo HD ready one that are still available for the unwary to buy.

--
Peter Crosland

Reply address is valid
  #5  
Old May 22nd 17, 07:58 AM posted to uk.tech.digital-tv
Brian Gaff
external usenet poster
 
Posts: 6,624
Default My TV has started 'posterizing'

Well, never heard the word, but two things come to mind. failure in the
chips that process the encoded signal and a breakdown in the screen itself
but apparently this tends to be localised to certain areas.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Roger Mills" wrote in message
...
I have a Philips 37" flat screen HD-ready TV which is about 10 or 11 years
old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather than
the set itself - but when I replay old footage from my Android tablet
(which was ok at the time it was recorded) into the other HDMI port, the
problem is present on that too - so it's almost certainly the set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.



  #6  
Old May 22nd 17, 08:02 AM posted to uk.tech.digital-tv
Brian Gaff
external usenet poster
 
Posts: 6,624
Default My TV has started 'posterizing'

A little bit extreme I'd say, if its been OK then its dependent on whether
the repair is possible or affordable really.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"PLC" wrote in message
...
On 21/05/2017 22:27, Roger Mills wrote:
I have a Philips 37" flat screen HD-ready TV which is about 10 or 11
years old. Of late, it's started posterizing its picture under some
circumstances.

[Posterizing is an effect available in many photo editing programs for
reducing the colour depth and hence displaying large patches of single
colours rather than graduations].

My picture isn't as extreme as that, and most colours are ok - but the
problem particularly affects (European) skin tones - and there are often
large green patches on people's faces and exposed arms, etc. People with
darker skins display ok.

The set is fed by an HDMI cable connected to a Humax PVR, and I wasn't
sure at first whether it was a problem with the Humax or cable rather
than the set itself - but when I replay old footage from my Android
tablet (which was ok at the time it was recorded) into the other HDMI
port, the problem is present on that too - so it's almost certainly the
set.

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


After ten years it is beyond economic repair. Buy a true HD one not a
cheapo HD ready one that are still available for the unwary to buy.

--
Peter Crosland

Reply address is valid



  #7  
Old May 22nd 17, 09:15 AM posted to uk.tech.digital-tv
Roderick Stewart[_3_]
external usenet poster
 
Posts: 2,040
Default My TV has started 'posterizing'

You'd be very lucky to find anyone with the resources to repair
anything electronic these days. Even if you could, they probably
wouldn't actually repair it, in the old sense of actually diagnosing
the fault and replacing the relevant part from their on-site store of
generic electronic components. They'd probably determine the need to
replace an entire module or circuit board, such a specialised
component it would need to be ordered from the manufacturer, if they
still had any, which with distribution and handling charges would add
up to more than the cost of a new TV.

Even if it added up to no more than about two thirds of the cost of a
secondhand TV, complete and already working, I doubt if I'd want to
get involved with the complication of getting a repair done. A modern
replacement would probably outperform a ten year old TV and be less
power hungry as well.

Rod.

On Mon, 22 May 2017 09:02:46 +0100, "Brian Gaff"
wrote:

A little bit extreme I'd say, if its been OK then its dependent on whether
the repair is possible or affordable really.
Brian

[...]

After ten years it is beyond economic repair. Buy a true HD one not a
cheapo HD ready one that are still available for the unwary to buy.

  #8  
Old May 22nd 17, 10:50 AM posted to uk.tech.digital-tv
PLC
external usenet poster
 
Posts: 16
Default My TV has started 'posterizing'

On 22/05/2017 09:02, Brian Gaff wrote:
A little bit extreme I'd say, if its been OK then its dependent on whether
the repair is possible or affordable really.
Brian


Far from it. The harsh reality is that the OP will find it very
difficult to find a repairer and the cost of just dignosing it is likely
to be at least £50. It is just money down the drain!


--
Peter Crosland

Reply address is valid
  #9  
Old May 22nd 17, 11:54 AM posted to uk.tech.digital-tv
Mike Tomlinson[_2_]
external usenet poster
 
Posts: 337
Default My TV has started 'posterizing'

En el artículo , Roger Mills
escribió:

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


Given the age, the first thing I would look at is the capacitors in the
power supply. They're likely to be failing, especially if the set runs
hot. This causes voltage changes on the PSU outputs which can cause all
kinds of weird symptoms, including the one you mention.

If it is the caps, it's a straightforward and cheap fix for anyone handy
with a multimeter, a screwdriver and a soldering iron.

If you come up with a model number, I'll see if I can find a circuit
diagram. I've got 118GB of diagrams for various TVs etc. here.

--
(\_/)
(='.'=) "Between two evils, I always pick
(")_(") the one I never tried before." - Mae West
  #10  
Old May 22nd 17, 01:23 PM posted to uk.tech.digital-tv
Roger Mills[_2_]
external usenet poster
 
Posts: 268
Default My TV has started 'posterizing'

On 22/05/2017 12:54, Mike Tomlinson wrote:
En el , Roger Mills
escribió:

Anyone care to hazard a guess as to the root cause? Is it likely to be
easily fixable?


Given the age, the first thing I would look at is the capacitors in the
power supply. They're likely to be failing, especially if the set runs
hot. This causes voltage changes on the PSU outputs which can cause all
kinds of weird symptoms, including the one you mention.

If it is the caps, it's a straightforward and cheap fix for anyone handy
with a multimeter, a screwdriver and a soldering iron.

If you come up with a model number, I'll see if I can find a circuit
diagram. I've got 118GB of diagrams for various TVs etc. here.


Thanks. It's a Philips 37PFL5522D/05

--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.
 




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