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There is something wrong with its internal circuit board. These blinking are fault indications; and is called blinking codes. Each and every brand will have a preset number of blinking codes. If you wish to get more details, check this
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Five blinks - AKB circuit (automatic kine bias), the
timer/standby indicator blinks for about 30 seconds then goes to the
self-diagnosis function. Something is wrong with the video. Check video
out, Q705, 732, 761 and other components on the C board, also check
Q218, 219, 220 on the A board. In addition, unit could be in IK
blanking, try turning up screen slightly.
Sounds like a failure in the C Board or AKB Circuit.
I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.
Take it to a shop... It's a good bet that the jungel Ic, crt driver Ic or something in the HV has failed. Could be also that the crt itself is failing. If that's the case a tech can test it with a B&K and know for certain.
Also, if you want to save a few dollars take it in to them, don't make them come and get it - it just drives the price up for a pu/del charge.
You can try this on the remote in standby mode, meaning tv plugged in but set off. Press Display,5,vol+,power on remote.Press each button within a 1 sec interv. Next the CRT display the item being adjusted. Press 1or4 on remote to select item. 3or6 to change the data. Press Muting then Enter to write into memory. Service Reset muting green enter red. Press 8 then enter on remote to initialize. turn set off to exit. wait least 10 sec. before turning back on.