Test 5 Door Switch Test - LG DGS2028EKD Service Manual

Test 5
Door switch test
NOTE: This test has two parts. The best test of the door switch system is done in the diagnostic mode. This
FUNCTIONAL TEST will test the door switch, wiring harness and PCB operation. If the results of this test are
normal, the door switch system and PCB response are normal. The problem is somewhere else.
FUNCTIONAL TEST (Control)
1. Enter the diagnostic mode. (See DIAGNOSTIC TEST MODE on page 18.)
2. With the door closed, press the START/PAUSE button once. The dryer will start tumbling without heat.
3. Open the door. The drum will stop tumbling. The "dE" error code should be displayed, the chime should sound seven times (if turned on), and
the drum light (if equipped) should come on. If the "dE" error code is not displayed or the light does not come on, proceed with the
MECHANICAL TEST below. If the error displays and light comes on, the door switch is working properly.
MECHANICAL TEST
Disconnect the WH1 and BL3
connector from the main PCB.
Measure the resistance
between the NA6-6 (GN) pin
and a chassis ground screw.
Is the resistance <1 Ω ?
Disconnect the BL2 and WH4
BL2
connector from the main PCB.
WH4
Measure the resistance
between BL2-1 (WH) and
WH4-1 (YL). Is the resistance
4 3
2 1
< 1 Ω with the door closed and
∞ Ω with the door open?
*Skip this step if the dryer does
not have a drum light.
WH4
Disconnect the WH4 and the
black tab relay connectors from
the main PCB. Measure the
resistance between WH4-1(YL)
and WH4-1 (BK). Is the
4 3
2
1
resistance <1 Ω with the door
opened and ∞ Ω with the door
closed?
Refer to the individual door switch and light
bulb/socket component tests.
NO
• Replace
the main
PCB.
YES
NO
• Replace
the light
bulb.
• Replace
the light
NO
socket.
YES
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