Troubleshooting Guide - LG FLATRON L1930SQ Service Manual

(POWER INDICATOR OFF)
1 CHECK J603 VOLTAGE
PIN5, PIN6 (5V)?
1
U202 PIN 32 Voltage
CHECK KEY CONTROL
CONNECTOR ROUTINE
2
VOLTAGE REPEATED AS
PULSE SHAPE?
CHECK DATA LINE
CONNECTION(U201, U202)
Waveforms
1
J603-#5,6/U202-#32

TROUBLESHOOTING GUIDE

NO POWER
YES
CHECK
(5V) ?
YES
YES
IS U201
PIN 5 OR 7
YES
2
U201-#5,7
1. NO POWER
NO
NO
NO
- 16 -
CHECK POWER BOARD, AND
FIND OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK 5VS LINE
(OPEN CHECK)
NO PROBLEM
CHECK U201 VCC
XTAL, RESET