Sharp LC-20B4M Service Manual download pdf (Page 15)

LC-20B4M

6. Lamp error detection

6-1. Functional description

This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety

when the lamp or lamp circuit is abnormal.

If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is

executed, the followings occur.

1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side

of TV turns from green to red.)

2 If the situation 1 happens 5 times sequentially, television can not be turned ON. (The power LED remains

red.)

6-2. Countermeasures

6-2-1. Check when turning OFF the lamp error detection

When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment

process with the power LED red. Entering the adjustment process turns OFF the error detection and

turns ON TV.

This enables the operation check to detect errors in the lamp or lamp circuit.

Check whether "ERROR NO RESET" on line 4, page 1 of the adjustment process is 1 or more. If it is 1 or

more, it indicates the lamp error detection was executed.

6-2-2. Resetting of the lamp error count

After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO

RESET" on line 4, page 1 of the adjustment process and set the number to 0 using the volume button.

M O D E L A640M

I N C H S I Z E 20

E R R O R N O R E S E T 5

P U B L I C M O D E ON

E X T C O N T R O L OFF

V P C S H A R P N E S S ON

V P C F P 2 F H R E A D OFF

E X T M O D E UART

U P D A T E M O D E NORMAL

T E X T R E S E T OFF

V E R R O M 1. 0 0 G AI B U 0. 0 0 0

Reset 0

Page 1 of the adjustment process

Afterwards, perform the operation check to confirm that the lamp error detection does not function.

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Sharp LC-20B4M Service Manual Page 15