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Vertical Deflection problem...either a bad chip (TDA 8177) or bad connection on the pins of the chip. You have to turn the deflection board upside down by unpluging and unclipping the plastic clips to solder. If soldering does not fix you will need to change the chip and possibly a 100mfd capacitor next to the chip. The chip is located just to the right of the high voltage transformer on a metal heat sink. Has 7 pins 4 in one row and 3 in the other row protruding out and then down into the board
1. Remove the 5 screws from behind each speaker 2. Grasp bottom center of plastic panel and "pop" forward. Swing upward to remove. 3. Remove 4 screws from the wooden panel in center. 4. There is a "black box" in the very front of electronics. It will have torque paint on the 2 rows of 3 screws. top row is labeled "focus" MY TV would go green before going black. Volume still worked. 5. I turned the center bottom screw (marked "green") appx. 1/8 to 1/4 turn COUNTER clockwise. Plugged TV in and it works fine.
I am not familiar with that particular model but most are similar.
It may need the blue focus adjusted. Most tv's have some type of automatic focus. If the blue is out of focus it can "bloom" beyond the red and green. There should be a focus block with 6 adjustments (2 rows of 3) behind the speaker cover. I wouldn't mess with the one labeled screen or block. Adjust very carefully. They are usually in the order Red-Green-Blue with the focus on the bottom row.
the lenses are accessable by removing lower back of unit,clean them with a damp paper towel-wipe them off with a dry one.put back back on unit.
screen/focas controls are in front of unit.remove speaker grill remove black cover using phillips screwdriver.you will see 2 sets of controls.one row is focas.one row is screen controls.red,green,blue.turn each focas control slowly to get the clearest picture for each color.screen controls are touchy(if you turn then too high unit will shut off)if the black and white picture was good i would not adjust screen controls.if it was bad turn blue and green screens down all the way.picture is now red turn green up until it turns yellow then turn blue up until it turns white
If you can solder, try resoldering the pins on the convergence ICs. If that fails to resolve the problem, replace the ICs. Please note that there are potentally dangerous hogh voltages present inside hte set even when unplugged.
This is a common problem on older RCA projection tvs. There is a small power supply that powers the convergence circuit and that is what usually fails causing this issue. The model # will help you get the correct part. If you open the back of the set, it is the power board mounted above the convergence board (above the board with row after row of heatsinks). There will be a red and black wire that drops down to the convergence amp.