CTC169

First off, let me say that I'm not a TV tech.... I'm an elec. eng. who
does controls for a living.

Anyhow, I got this dead RCA set for free and am working on it for fun
and to learn.

The TV: RCA colortrack 2000 invar CHASIS CTC169


The set was initially dead. After reading through many postings in
this group... I have done the following troubleshooting and replaced
the following components.

Failed components found:

blown 5A inline fuse
Open flame proof resistor 2.5 ohm (if i remember correctly)
Shorted B+ regulator


Components replaced: (based on my internet reading)

Above mentioned parts plus....

CR4118
U4101
C4102
C4104
C4108


The set is no longer dead but presents some odd symptoms. The set
powers up.... audio is fine. The first thing I see is a horizontal
green line across the screen which is shortly replaced by a picture.
The picture and menus are darker then they should be and are
vertically stretched. If I do an autoprogram (channel search), the
picture will return to a normal size, but will remain on the dark side
with the menus showing up in dark blue which is barely visible. Once,
the set is powered down and back up, the picture is once again
vertically stretched and cured by autoprogram.

I've measured the cathode voltages of CR4118 & CR4116 to the ground
around the picture tube. The voltage readings are 12.47 and 135
respectively Based on my reading, these sound a bit low, but I'm not
sure where to go from here. I have followed the ground path around
the board and cleaned up some solder joints, but the symptoms
persist. Any thoughts?

Thanks
Bob

.

Relevant Pages

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