mansal48
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Nov 5, 2008, 6:57 AM
Post #7 of 7
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If your low voltage power supply is working you will have normal turn on. If you loose picture, check the high voltage section. Maybe starting at the flyback, then progress to voltage divider. However, open the tv and check each colored tube, red,green, blue. Look at each board on the neck end, see if you have any burnt resistor's. If you do then the obvious is, when the tv was moved it might have cracked the neck of the crt of the respective board/color crt. Don't know the details if tv had just been moved.
If tv was sitting for a long time and all of a sudden went out. check the flyback, voltage divider and respective components. Some rear projection have two H.o.t's. I don't have the schematic for this particular brand, however once you become familiar with these rear projections it's basic. Also check the high voltage section and look around all the Heat sinks, where high heat develops. Check for loose solder or bad diodes (these are abvious big diodes with heat sinks on its leg). Check for the large capacitor's here for dry or bulged, swollen cap's. Replace these with high temperature caps the exact or compatible brands.
Now, listen here carefully, and closely, do not attempt unless you have schematic. Some rear projections you can damage with this procedure.***
PROCEDURE***Unplug power cord, you can undo one highvoltage (red wire) leg from the voltage divider per respective color. unplug one at time (WITH HIGH VOLTAGE GLOVES, GOGGLES) or else stay out. Unplug red crt from voltage divider, the big red wire, then turn the tv on. Then unplug power cord again. Repeat for the blue, then green all have it own big red high voltage wire. If the tv picture comes on, with one of the color's unplugged then you have a bad crt for that respective color. *****iF TV comes on you found a bad crt. If tv does not come on check for local high voltage components. starting with flyback, hot, diodes, and especially the voltage divider. I'd check flyback and voltage divider first. These two have to be replaced if one or the other goes out.
And of course, check for the crt fluid, coolant leak. You can see coolant fluid as you look directly into each color tube. MAKE SURE POWER CORD IS DISCONNECTED AND CAPS DISCHARGED. AND EACH CRT DISCHARGED.
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