Dell 1800FP Service Manual - Page 13
Check Dot Clock, Pattern, Trouble In, Check, Dvs Pattern, Dhs Pattern, Lcd Module, U401 Pin 8, V.
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Page 13 highlights
YES CHECK L204 PULSE ? NO TROUBLE IN U201 YES CHECK U401 PIN 10 PULSE ? NO CHECK DOT CLOCK PATTERN YES CHECK U401 PIN 8 V.PULSE? YES NO CHECK DVS PATTERN CHECK U401 PIN 7 V.PULSE? YES NO CHECK DHS PATTERN TROUBLE IN LCD MODULE - 13 -
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CHECK DOT CLOCK
PATTERN
NO
TROUBLE IN
U201
NO
CHECK
DVS PATTERN
NO
CHECK
DHS PATTERN
NO
YES
YES
YES
YES
YES
TROUBLE IN
LCD MODULE
CHECK
U401 PIN 8
V.PULSE?
CHECK
U401 PIN 7
V.PULSE?
CHECK
U401 PIN 10
PULSE ?
CHECK
L204
PULSE ?