Question about Hitachi 50VS810 50" Rear Projection HDTV

1 Answer

Overheat led blinking

No picture or sound. temperature indicator is on (blinking) tv was unpluged for 10 minutes. when i repowered it the problem remains. i suspect a temperature sensor is bad. i found a
tokin ohd3-90m physically attached to the fan housing.
how can i test this co hitachi 50v500a projection lcd mponent? or what else might be the problem?

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Did you ever get a answer to this question? I have a hitachi 50vs810 with the same problem. I found the same sensor "tokin ohd3-90m."
I ohmed across mine and it shows open. I then held my lighter under it and it stayed open. I suspect this part is bad so I tried jumping it out. No change. Still have the same blinking temp light.
So... in the end I don't know if I tested it right or not either. Good luck and let me know if you learned anything that can help me out.

Posted on Feb 16, 2011

  • Ron Treat Feb 16, 2011

    I looked at the specs for the tokin ohd3-90m thermal switch. It should be open until it is heated to 90 deg celcius. The -90m means it Makes at 90 degrees celcius. so just ohm across the leads ond it should be open at room temp.

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