Checking The Back Light Unit - NEC MultiSync LCD1550ME Service Manual

Table of Contents

3. Checking the back light unit

Is +15V supplied to P803 pin 3, 4 to

inverter PWB?

Check the INV_EN signal of the rectangle input I309 pin 5 at TTL high level

Check the PWM signal of the input from I302 pin 1 is a BRI signal.

Failure point

1) Inverter cable disconnection.

2) Inverter of LCD module failure.

Failure point

Inverter cable disconnection.

Is a "H" level being output in the TTL level from I302 pin 2

Or, is INV_EN signal of the rectangle being output?

Failure point

Printed wire broke between

I302 pin 2 and I309 pin 5

1) Printed wire broke between

I302 pin 1 and I309 pin 3.

2) I309 failure.

Failure point

6-6

Table of Contents

Table of Contents

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