LG L1915S Service Guide - Page 14

Troubleshooting Guide - problems

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TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 VOLTAGE PIN5, PIN6 (5V)? YES CHECK U501 PIN 8 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 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN114 (3.3V) VOLTAGE ? YES CHECK U201 PIN 122 PULSE YES CHECK U201 NO NO - 12 - CHECK 3.3V LINE CHECK X-TAL

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- 12 -
TROUBLESHOOTING GUIDE
1. NO POWER
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
U501 PIN 8 Voltage
(5V) ?
NO
NO
NO
CHECK U201 PIN 122
PULSE
CHECK U201
CHECK 3.3V LINE
CHECK X-TAL
IS U201
PIN114 (3.3V)
VOLTAGE ?
YES
YES
NO PROBLEM
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
YES