The sides of the picture on my tv started curving inward displaying an hourglass effect. From what I read, it is a pincushion problem. I don't have and can't find a service manual for this set, so I don't know where the pincushion area of the mainboard is. Any help would be appreciated.
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Unfortunately from your description this a complex issue and cannot be adjusted out. The cause is a shorted winding in the horizontal section of the yoke, or the high voltage capacitor has decreased in value causing the hourglass effect, depending on the problem will dicktate cost to repair, I suggest an estimate before a decision is made, and if the set is more than five to ten years old consideration should be given in a replacement.
Their are pincushion circuits the compensate for inward curvature. It is common for solder connections to break on the pincushion transformers or the connections where the transformer wire is wrapped around the connector pin. Careful inspection under a magnifying glass while manipulating the pin sometime will show hairline cracks in the solder. Their are also adjustments on the convergence board that will compensate. The adjustment potentiometers on the convergence board also have shown to be prone to solder cracking on the PC board
Sorry Ginko, but a convergence problem would have the curves down from the top and up from the bottom. The hourglass shape is a pincushion problem. This can be as simple as a bad capacitor in the pincushion circuit.
Could you please confirm the model number so I can look up the probable part?
i would start there, or send the board in and have it checked out at ptscorp.com
Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html http://www.hdtvoice.com/voice/showthread.php?t=28929
CRT monitors suffer from the so-called pincushion effect. It is the
curving of the actual video picture usually inwards on the sides. There
is often an adjustment to compensate for this and it's usually situated
near the other user controls. Look for it in you manual.
because of magnetism differences in the world. The monitor is setup to
work where it was built. The pincushion effect get worse over time. The
degree of severity depends on the location of the monitor and the
quality of the design of it to facilitate enough future re-adjustment
by turning the pincushion knob.
The shape your seeing is called 'V Bow' and 'Pincushion' which needs to be calibrated again.
Theres probably a diode that went out. The tech can open it up and adjust the angles back. I wouldn't charge over $100-$150. Shop around for a good repair tech. Good Luck poe_diddley.