LG FLATRON L1730S; FLATRON L1930S - Troubleshooting: No Power; No Power Troubleshooting Flowchart

- 18 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK KEY CONTROL
CONNECTOR ROUTINE
CHECK DATA LINE
CONNECTION(U201, U202)
NO
NO
CHECK POWER BOARD, AND
FIND OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK 5VS LINE
(OPEN CHECK)
NO
CHECK U201 VCC
XTAL, RESET
YES
YES
YES
YES
CHECK J603 VOLTAGE
PIN5, PIN6 (5V)?
CHECK
U202 PIN 32 Voltage
(5V) ?
IS U201
PIN11(3.3V)
VOLTAGE REPEATED AS
PULSE SHAPE?
NO PROBLEM