LG L1750SQ-SN Service Manual - Page 15

LG L1750SQ-SN Manual

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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 NO CHECK POWER BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN90 (3.3V) VOLTAGE ? YES NO CHECK 3.3V LINE 1 CHECK U201 PIN 96 PULSE YES NO CHECK X-TAL CHECK U201 Waveforms 1 U201-#96 - 14 - 龙泉现代YDW资料收藏

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TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK KEY CONTROL
CONNECTOR ROUTINE
CHECK U201
NO
NO
NO
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK
5VS LINE
(OPEN CHECK)
CHECK 3.3V LINE
NO
CHECK X-TAL
YES
YES
YES
YES
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
CHECK
U501 PIN 8 Voltage
(5V) ?
IS U201
PIN90 (3.3V)
VOLTAGE ?
CHECK U201 PIN 96
PULSE
1
NO PROBLEM
1
Waveforms
U201-#96
龙泉现代YDW资料收藏