Re: Sony Black Trinitron 24" with weird colour (pink)
- From: meow2222@xxxxxxxxx
- Date: 13 Aug 2006 16:15:05 -0700
Edu wrote:
Hello Peter, thanks a lot for your useful reply!
Without testing it I'd say its more likely a video drive problem, but
it might well be a crt fault. Its not falling crt emission, if it were
just that you wouldnt be getting green retrace lines. I'd measure the
voltages on all the non-EHT tube electrodes to see how the green
voltages compare to the other 2 colours. Also I'd measure the amount of
green drive vs red and blue. Tjis should tell you whether the prolem is
crt or video drive or other electrode voltages.
I have an oscilloscope. I will ASAP check differences in voltage for
all 3 colors in the CRT neck, right?
if its a battery scope, maybe, if its mains, uhoh. A multimeter is more
pratical and less likely to make anything go bang.
If the fault is the crt, you might be able to burn off an internal
short, if not its well & truly had it.
How can I burn an internal short?
pass a wallop of current thru it.
If the fault is video drive, thats usualy fixable but not in every
case.
If its other tube electrode voltages, thats the easiest to sort out.
I will try to check if variations in screen voltage improves something.
no, that wont do anything. Just measure the electrode voltages and
compare the 3 channels. And of course dont touch THAT electrode.
There is also the final possibility of very low green emission plus
someone has unably tried to tweak the drive/background to comppensate
and has screwed those settings up. In this case the set would have very
slowly got pinker and pinker over time, so you should usually know if
is this or not. Low emission is easy to fix on most sets if you know a
bit about electronics.
I'm not sure of what you are saying... "Over time" do you mean along
days/months or along first minutes since turning on?
months
If youre not familiar with the dangers inside tv sets, learn first or
leave them alone. TVs and microwaves are the 2 household appliances you
really should not mess with unless youre upto speed.
All I know is I have to unplug mains, discharge capacitors, discharge
all HV from FBT to tube grid, and after some seconds try to discharge
again.
then you need to read understand and follow what I said, or we may not
hear from you again.
Is it reasonable to try to enter service mode in the OSD to tune some
parameters???
doubt it. Not whats needed anyway.
NT
.
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