KF-50DX200K, KF-60DX200K - Sony TV Service Manual (repair manual). Page 7

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3 : Lamp Cover

When lamp cover SW is opened then pin 4 of CN1908 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 CN1908 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.

24 AUDIO PROT

43 LOW B ERR

D1902

CN1908

D1901

M board

A board

T board

IC9004

MAIN CPU

+5V DETECT

LAMP

DRIVER

LAMP

HV DETECT

FAN1

FAN2

IC9502

LCD ENGINE

+5V 

LAMP DRV

HV DET

LAMP PROT

28

FAN PROT 24

LAMP PROT 29

3. Lamp Cover

LAMP COV

HV DET

LAMP PRT

FAN1 PR

FAN2 PR

4. FAN Stop

9. Audio

6. Low B

LAMP COV 27

Q9505,9507-9509

S8001

DC DETECT

Q1211, 1213,1215

IC9005

AUDIO AMP

IC1203, 1204

4

12

3

8

10