KF-50XBR800, KF-60XBR800 - Sony TV Service Manual (repair manual). Page 10

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3 : Lamp Cover

When lamp cover SW is opened then pin 4 of CN1012 on the A board is high, LCD Engine µ-com (IC9502) detects
it and make turn off the lamp.

4 : FAN Stop

When FAN1 or FAN2 is stopped then pin 8 or q; of CN1012 on the A board is high, LCD Engine µ-com (IC9502)
detects it and make turn off the lamp.

5 : Lamp Driver

When lamp is not turned on then pin wl of LCD Engine µ-com (IC9502) is high, checks pin wk of LCD Engine µ-com
. If pin wk is low, it is judged no High Voltage.

6 : Low B

Detect +5 V line failure.

9 : Audio

When DC is appeared by audio amp failure at speaker line.

Then it is detected by MAIN µ-com (IC9004) and it turns off the main power.

LAMP : Lamp error

When lamp is not turned on then pin wl of LCD Engine µ-com (IC9502) is high, checks pin wk of LCD Engine µ-com.
If pin wk is high, it is judged lamp is burned out.

     

   

 

 

 

 

  

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