(2)CHECKOUT PROCEDURES FOR RELAY.

-PROBLEM (A) -

TT motor and oven lamp turn on without touching START key when the door is closed.

NO

YES

GOOD

Remove the mate connector of I/O CON from the circuit board.

Does the unit still operate?

NO

YES

Replace the circuit board

Defective

RELAY3

Replace

RELAY3

- PROBLEM (B) -

TTmotor and oven lamp turn on When the door is closed and START key is touched.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GOOD

Measure the voltage at pin NO.

4 of U01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage reading: 0 Vdc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the circuit board

Defective

RELAY3 or poor

connection of

RELAY3

Replace

RELAY3 or correct

the connection.

7-19

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LG Electronics LMV1625B, LMV1625W service manual Checkout Procedures for Relay Problem a

LMV1625W, LMV1625B specifications

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