Question about Mitsubishi WD-52725 52". Rear Projection HDTV
As TV warms up,purple lines roll faster horizontally across screen.Picture is dim also.
ONE: Yes, the speaker mounted close/near to the set can be a cause of mischief; please move it further away and see if that helps clear up the problem. But, you must keep it away for several days before you will know for sure because it takes some time to degauss all the internal parts that may have become corrupted by the magnets in the speaker.
TWO: Yes, any set can be repaired the question is cost and wisdom. Old sets are sometimes not worthy of the repair simply because of the likelyhood that another failure will follow soon after. A big screen always invokes a repair charge of $200 and up. After a few of these you will wish you had put all the money into a new set!
THREE: The lines are most likely a problem in the vertical blanking circuits of the set. These are horizontal retrace lines that are supposed to be blanked out during vertical retrace of the raster. Think of it as a paintbrush that scans across the screen painting thin lines and when you get to the bottom of the screen it goes quickly back to the top, but during that time the horizontal, which is many times faster, has made several sweeps; so it must be blanked out during the retrace. The repair involves finding the guilty parts and replacing them. Usually this repair runs over the $200 somewhat.
FOUR: Prior to calling in a service tech try a hard reset to see if that will recover any of the circuit degradations. Merely unplug the power cord and leave unplugged for 4 hours or more. It may help. Or, it may not help; but worth a try since is won't cost you anything.
If the set is over 5 or 6 years of age it probably is not a condidate for any expensive repair. On the other hand, it is a Toshiba - and they make a fine set.
Hope this helps. Let me know if you have further thoughts.
Posted on May 09, 2009
You will need to remove the signal board. This is the board with the RCA jacks and RF connectors. On this board there will be many components that are numbered. You will be searching for two capacitors that are bad. These are the locations and values. The first is capacitor location, C2V29, which is 16 volts at 22Mf , replace this. The next will be C2P05 which is 16 volts at 100 Mf, replace as well. And if you do have the board removed, you should, as well, resolder the pins on the convergence ICs. These are ICs are mounted on large heatsinks. Inspect the board for any and all other bad solder grounds. Thanks for asking and show a few hands of support.
Posted on Dec 12, 2010
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