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Check the collector voltage of blue output transistor at its video output board, which can be located directly plugged onto the neck of the picture tube. Check for any loose solder terminals at this board.
this sounds as if the tube (crt) as a intermittant short in the red gun , try tapping the neck of the tube very softly with a screw driver handle, this just might just clear the fault
If you have a Sony rear projection LCD TV then you have a failing optics block. LCD TV's are not affected by external magnets like CRT TV's were. The optics block issue will only get worse and needs to be repaired by a technician.
This is not a problem that a reset will fix. THe 5 blinks is a code that indicates a problem with the AKB circuit. There is a possibility that the picture tube is starting to fail, but that is rare. If you are comfortable working inside the set where there are potentially dangerous high voltages even when unplugged, let me know and I will provide additional details and instructions for a couple of repair options.
If it is in one of the corners it is a magnetic interferece problem. Most '90s and later sony tvs have a built in degaussing. Turn the tv off and turn in back on and it will degauss. If you have speakers too close move them away. If you have the tv on and move the speaker away you can see the effect.
this sympton is characterized by the presence of red, cyan, green, magenta, blue or yellow colour in a supposedly plain white raster. proper colour reproduction cannot be expected if the raster is coloured.
this symptom is caused by a poor white balance adjustment of by a trouble in the CRT, colour amplifier, color demodulation or colour output circuits.
if the raster has a tint of red or cyan, check the R-Y output circuits and the first grid, second grid and cathode circuits of the red electron gun.
but if you dont know anything about this, just bring it to a qualified service technician. good luck!