Failure Mode - LG LSCE365ST Service Manual

Problem
Flashing
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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

FAILURE MODE

Possible Causes
• TH1 is open/short or 26, 27
port of Micom(U21) is
open/short.
• TH2 is open/short or 35, 56
port of Micom(U21) is
open/short.
• TH3 is open/short or 34, 56
port of Micom(U21) is
open/short.
• Food spill/soil on touchpads.
• Object placed on touchpad.
• Touch time is long.
• There is a fault with Display.
• Low voltage detection
Solutions
• Turn the cooktop off using the Power ON/OFF.
Turn cooktop back on using the Power ON/OFF.
• Check the electric resistance TH1
(77˚F/25˚C)
• Change the main pcb
assembly.
• Turn the cooktop off using the Power ON/OFF.
Turn cooktop back on using the Power ON/OFF.
• Check the electric resistance TH2
(77˚F/25˚C)
• Change the main pcb
assembly.
• Turn the cooktop off using the Power ON/OFF.
Turn cooktop back on using the Power ON/OFF.
• Check the electric resistance TH3
(77˚F/25˚C)
• Change the main pcb
assembly.
• Clean the surface.
• Remove object from the touch pad.
• If any one of the keys is touched for more than
10 seconds continuously, this error will be
displayed.
• If water or a metal object is placed on the
touchpad this error will be displayed.
• Turn the cooktop off using the Power ON/OFF.
Turn cooktop back on using the Power ON/OFF.
• Turn the cooktop off using the Power ON/OFF.
Turn cooktop back on using the Power ON/OFF.
• Check the connection of CN2 on Interface PCB.
• This represents low voltage to the cooktop. Call
a licensed electrician.
- 76 -
8.13kΩ (a-b)
+5V
R71
1K a
26
U21
TMP86FS49AFG
27
b
8.13kΩ (c-d)
+5V
35
U21
R80
1K
c TMP86FS49AFG
56
O20
RLS414B
d
8.13kΩ (e-f)
+5V
34 U21
R88
1K
e TMP86FS49AFG
56
O19
RLS414B
f
LGE Internal Use Only