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LB500K-GL
Service manual
Troubleshooting Guide - LG LB500K-GL Service Manual
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TROUBLESHOOTING GUIDE
NO POWER
(POWER INDICATOR OFF)
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
YES
CHECK
U802 PIN 1
VOLTAGE
(5V) ?
YES
CHECK
U805 PIN 1 Voltage
(5V) ?
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
IS U201
PIN12 (3.3V)
VOLTAGE REPEATED
AS PULSE
SHAPE ?
NO
CHECK IIC LINE
CONNECTION
(U501, U502)
1. NO POWER
NO
NO
NO
NO
CHECK U201 VCC,
XTAL, RESET
- 13 -
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK U803.
CHECK 5VS LINE
(OPEN CHECK)
NO PROBLEM
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