Re: UPDATE: TV Missing color diagnosis


"TEX" <tex@xxxxxxxxxx> wrote in message news:1154356295.483649@xxxxxxxxxx
After checking the CRT neck board again and found no obvious faults. I
checked the driver signals and found that the Blue drive is double of that
of the other two guns.
As previously stated I am sure i noticed that the cathode voltage had
equalised after a few minutes of running, but coloured hue was still
present.

Will trace back further and see what else I can find. So maybe it isn't a
CRT output drive board then...


TEX



TEX wrote:
Confirmed it is not a color driver feed issue. Found a schematic for
another model TV and from that worked out which wires were the
control/drive lines. 5 wire connection RBG gnd and 12v. All the input
drives give value of around 3.1v. Swapped drives and confirmed they
working.

So confirmed it is either a CRT fault or neck board fault. I was hoping
that since the voltages i was getting at the driver transistors are the
same weather the board is connected to the CRT or not, then it is board
board.

Where to next??

TEX


Perhaps it has developed a small short do to oxidation in the picture tube.
If you can find an old shop around with a picture tube rejuvenator, or if
you might have one, hook up the tube and do a short test and zap the grids
with it. Might not take much to get it back to good shape, since you say it
work fairly well and only has a slight dulling to the green.


.

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