My RCA 27V530T has sound bu t no picture. Could this just be the picture tube?
There are many reasons for this fault, and picture tube is one amoung them; but a very rare case. Normally, for all picture tube based TVs, short in the windings or the LOT [Line Output Transforemer] is a normal case. If this occures, there will be no picture or screen at all, as all voltages to the picture tube, including its filament voltage are derived from this transformer. Check this first. If it has faulty, the drive transistor [horizontal output transistor] will also will get leakey. First check this transistor. If found leakey, replace it with same type and number. Switch ON the set for a short period of time, say 5 seconds or so, and check the heat of the replaced transitor by touch, after unpluging the set from AC mains. It can be some heat with this transisotr, but it should not overheat. If it overheats, make sure that the LOT said above is damaged, and should be replaced with same type and number. All these components can be bought from open electronic spare part selling shops at your town. You can do this work by yourself at home, provided must have sufficiant testing and soldering equipments; and a sound knoledge in electronics.
If you don't ahve these, get the TV repaired by any experienced service technician, of by the authorised service center for RCA at your town. OK.
Oct 12, 2011 |
RCA 27V530T 27" TV