Question about Philips 20PS40S 20" TV
The green screen control will adjust slightly. The adjustment doesn't last anymore. The green retrace lines keep appearing. I measured the voltage on the screen controls. Red & Blue are 400 vdc and can be adjusted, the Green is over 800 vdc and will not adjust down to 400 vdc. I reversed the green & red leads to confirm the green control was bad and the red retrace lines appear.
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Posted on Jan 02, 2017
SOURCE: 28PW9527 Retrace lines (?)
These adjustment controls are on the HT transformer. (Large plastic block on one corner of the main board - looks similat to a distributor cap on a car.) They are usually a plastic pot with a cross in the end to fit a flat blade screw driver. (This is the large blocks Philips TVs usually have three adjustments on the transformer:
When you have found the right control it will go brighter or darker.
Before adjustment, set the TV brightness control to about mid way. Ideally the screen should have a completely black image to show up the scanlines.
Adjust the control until the scanlines disappear. Do not over-adjust or the screen will appear too dark.
TAKE GREAT CARE not to touch anything other than the control. HIGH VOLTAGES
Posted on Mar 28, 2008
SOURCE: retrace lines in top of tv...
These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.
I do not have the service manual at this moment but you can google it by the model number of your TV.
Let me know if you need further assistance.
Posted on Jun 16, 2009
Picture goes to high green with retrace lines that shows picture tube is defective and requires replacement.
Usually in above symptom, TV goes to standby mode and standby light blinks when green raster problem occurred.
New TV is better option because picture tube of KV-34XBR960 would not be available any more.
Posted on Aug 14, 2009
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