2
4
CPU DIGITAL BOARD TROUBLESHOOTING GUIDE
DISPLY “BOX SEARCHNG”
no
yes
yes
no
no
yes
abnormalit
no
Test U38 waveform
from TXC±,TX0± ~
TX2±
Test whether U38 power
3.3V
Test wether U38 pin2
pin4 pin5 pin57 waveform
Check path turned 5V into
3.3v
Replace U38
Test whether power supply 1.5v;
2.5v; 3.5v
Check LDO circuit
Test oscillator X01 waveform
Check U8 rest pin2
Replace U12
Replace U8
yes
normal
Summary of Contents for LC-30K9A(W)
Page 1: ...COLOR TELEVISION LC 30K9A W LC 40K9A...
Page 17: ...15 4 JAG ASM...
Page 18: ...16 5 SiI170...
Page 19: ...17 6 LX1722...
Page 20: ...18 WIRING DIAGRAM 1 L30K9A W...
Page 21: ...19 2 L40K9A...
Page 32: ...L30K9A W SCH...
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Page 50: ...L40K9A SCH...
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