have your power supply checked, it might not have enough voltage to power up your horizontal deflection circuits. hope this help, thanks for using fixya!
the internal bulbs have deteriorated...the manufacturers are real smart, these monitors dont last forever. So if repair estimate is too expensive then replace the whole unit.
tv works ok for 35 minutes then it goes to blinking. turn off till fan shuts off it go for 35 than...
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tv works ok for 35 minutes then it goes to blinking. turn off till fan shuts off it go for 35 than back to blinking