Dell 1907FPf Service Manual page 37

1. No Power & Power LED Off:
IIIIIIIIIIDDISI
Is there DC 5V at L803
Is the voltage at C854 in the
Is the voltage at pin3 of U850 18V?
Is the voltage at pin6 of U850 0.8V?
Is the voltage at pin9&pin10 of T850 38V?
NO
Is there DC16V at L853?
NO
range of 127V~373V?
YES
YES
YES
YES
Check D856
YES
Check IF Board
NO
NO
NO
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Service Manual
Check RT850, F850
Check R855
Check D852, D854