LG L1511S Service Manual - Page 10

Troubleshooting Guide

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TROUBLESHOOTING GUIDE 1. NO POWER 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 CHECK POWER NO BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK U803. NO CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN12 (3.3V) VOLTAGE REPEATED AS PULSE SHAPE ? NO CHECK IIC LINE CONNECTION (U501, U502) NO CHECK U201 VCC, XTAL, RESET

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