Trouble Shooting - Dell 1907FPc Service Manual

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9.2 Trouble shooting

9.2.1 Main Board
Note: 1. If replace "Main-Board", Please re-do "DDC-content" programmed & "White-Balance".
2. If replace "Power Board" only, Please re-do " White-Balance".
No power
Please reinsert and make sure the
AC of 100-240 is normal
Measure CN601 PIN5/6=12V?
Measure CN601 PIN9/10=5V?
No power
Press power key and look if the
picture is normal
NG
OK
OK NG
X301 oscillate waveforms are
normal
NG
OK
Replace U401
u5[Pb€ g /• D e™ • Q
Reinsert or check the
NG
power section
Check power section
Replace X301
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Dell 1907FPc