Thanks for the response.
So everything will be adjusted using old (and hence, implicitly,
possibly knackered) CRTs. :-)
Doesn't there come a point at which it might be desirable to change
(e.g. to LCD) because that is what most people are viewing the end
result on? (I know, the reductio of that is to use a 2" speaker in a
bean can to monitor Radio 1 output.)
Hypothyroidism is a seriously debilitating condition with an insidious
Actually you can adjust an LCD to be just about anything you want.
I went through about an hour of doing just that here on this Mac,as
color photos were looking 'odd'
But mostly people don't. They want bright vivid colors not true
rendition. I found the same with the new digital camera. I followed one
guys recommendations. He lives i california. The result on a grey
english afternoon were ridiculous, so I went back to the defaults, and
suddenly I was out of kodak gold mode, into kodachrome mode...
Remember when the Beeb transitted test cards?
On the contrary - they still do on Freeview, although it's not the
best quality and doesn't work on all receivers:
- Go to channel 105 (BBCi) and press Yellow
- Switch to any other channel, then back to 105
- Press Green and wait for the word 'Secret' to appear, followed by
- Press in order - 3, 3, 5, 8, 2, Red, Green, Yellow, Blue
Me thinks BBC should stop this nancying about hiding it, and make this
page normally viewable for us mortals.
In the old days of analogue teletext anyone could pull up the 'clock
cracker' and other test pages. Didn't need things like the launch codes
for nuclear missiles entered...
... unless you actually *can* launch nuclear missiles by a hidden page
on DTT freeview and HM government is keeping stumm about it...
That sounds like it wasn't adjusted properly.
You turn the contrast to minimum and set the black level using the
brightness control, then you set the white level using the contrast control.
The two should not interact (changing either shouldn't affect the other), if
it does the set is poor quality.
On a lot they did interact and it was difficult to get a good picture, not
always the cheap sets either.
If it developed 'suddenly' then the most likely cause is a bad joint on the
tube base in either the green or red output amplifiers, depending on whether
it is a pink tinge on the highlights indicating an excess of red content, or
a pinky purple tinge on lowlights, indicating a lack of green content.
Either way, it would probably be short-term adjustable, but repair would not
be expensive, if this is indeed the problem, which is a common one on all
makes and models. Other possibilities include data corruption in the EEPROM
that stores the various settings, and less likely, the tube itself. Although
tubes can fail suddenly in this way, if some crap and corruption falls off
one of the cathodes and lodges against the grid, the effects of this tend to
be more severe than a 'tinge'. Tubes tend to fail gently over a protracted
period of time.
If the pink tinge is:
- in the dark areas, you need to adjust the red black level
- on whites but blacks are ok, you need to adjust green drive, and if
that doesnt work, increase voltage to the tube heater, which should
give you a long time more from it
- if it really is all over, you'll need to adjust the red black level
Chances are its a fairly easy fix, though it may require a 33-50%
voltage boost to the tube heater. Wehn I say easy fix, I mean if
you have electronics skills. Without them its best not to get fried,
tvs are riddled with serious risks internally.
If it is falling emission though, be very ware of repair shops, who
tend to rejuve tubes. This gives a great short term result, but after
a few months its then beyond repair. For some reason tube
boosting seems to have fallen from general knowledge in the repair
trade, so thats a diy option.
Tube boost is usually done by either of:
- add an extra turn on the LOPT, connecting it in series with the tube
- move tube heater power from a regulated rail to its unregulated
side, which gives around 4-5v extra
Most of the replies about positronic diffusers and flux capacitors went over
my head, but if you haven't already - try reconnecting any cables from other
equipment attached to the TV (or if they pass through another device,
reconnect the cables on that device too). I've had colour tinges caused by
loose SCART cables before.
Have you recently altered the orientation of the TV in the room?
That, combined with faulty degaussing circuit could produce that
problem. If only switched on and off via the remote, the degaussing
circuits do not operate. You might try turning it off at the socket a
few times, but leave a few minutes between to allow the circuit cool
down and recover.
I made sure ALL the scarts were plugged in at both ends and still the same
pink tinge to the whole picture. I am pretty sure the TV is broken and I am
just waiting for SWMBO to say she is sick of looking at a pink picture!
Tomorrow is Friday so a telly shopping trip is beconning on Sat/Sun.
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