I was curious if anyone might be able to reference a Zenith SY2551S problem. The picture is purple in color, meaning a failure in the green circuit. I am gathering the part is blown up, so the part number would be most helpful. Is there a common culprit for this failure on this chassis?
Additionally, I am troubleshooting two SL7573W with similar symptoms (probably bad filter caps). Does anyone possibly have a schematic for part values?
Thanks!
In general, with Zeniths, check the three small signal trasistors by the jungle IC.
2N3906, & the three large video drivers on the CRT board, on the pix tube neck. Do this...before you boost/rejuvinate the pix tube. Thetube MAY be ok. Hope this helps, Dani.cz wrote:
You should strongly suspect the picture tube if the tv sets were made between 1993 and 1997. It is a simple matter to ground each cathode on the crt with a 1K ohm 5 watt resistor to check for any kind of decent output from each color. You can also carefully swap the red and green drive on the crt socket with a careful removal of solder and addition of jumpers to confirm or deny that it is the picture tube.
The later models sometimes would have a 2n3906 next to the jungle ic that would go bad, typically on the Z line chassis.
The 'L' and 'Y' models almost all had bad picture tubes by now. The common culprit is the picture tube. Many times when it would fail it would also take out the power supply.
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