Question about Pioneer PRO-720HD 64" Rear Projection Television
This kind of symptoms indicated of problem in its convergence. If the symptom can't be adjusted or cured through the convergence alignment in the menu, this is an indication that convergence circuitry inside gone bad. Here are some of the convergence problem.
Your unit used set of STK392-110 as convergence IC's which is mounted in the heatsink. Replaced this IC and some of the resistor around which is also gone bad (mostly low resistance resistor) and your unit will back to normal again.
But before you replaced the IC's and resistors, check first the board for bad solder joints(cracked/dried/cold solder) in this section. You must work in the brightest area or used table /portable lamp and magnifying glass because this is hard to spot.
If you don't have necessary tools and test instrument and can't troubleshoot the unit yourself, I would advice you to look for a qualified tv technician to isolate the problem.
Also, check if your unit is still under warranty/extended warranty period, avail it because the manufacturer will fix it for free. Opening the back cover will void the warranty.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
Posted on May 26, 2011
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Posted on Jan 02, 2017
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