Troubleshooting Guide - LG Flatron L1910B Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
YES
CHECK
U501 PIN 8 Voltage
(5V) ?
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
IS U201
PIN114 (3.3V)
VOLTAGE ?
YES
CHECK U201 PIN 122
PULSE
YES
CHECK U201

TROUBLESHOOTING GUIDE

1. NO POWER
NO
NO
NO
NO
- 14 -
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK 5VS LINE
(OPEN CHECK)
NO PROBLEM
CHECK 3.3V LINE
CHECK X-TAL