Dell 1800FP Service Manual - Page 12
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NO RASTER CHECK J702 PIN 1, 2, 3 (12V) ? YES CHECK J702 PIN 8 (5V) ? YES CHECK X501 H. PULSE ? YES CHECK U201(GM5020) ? YES CHECK L201, L202, L203 PULSE? YES CHECK U301, U302, U303 PIN 35 MEMORYCLK? 2. NO RASTER NO NO NO NO NO NO TROUBLE IN BULT-IN POWER or L703, L704 TROUBLE IN INVON PATTERN TROUBLE IN X501 TROUBLE IN U201 TROUBLE IN U201 TROUBLE IN U201 - 12 -
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2. NO RASTER
TROUBLE IN
INVON PATTERN
CHECK
J702 PIN 8 (5V) ?
NO
NO RASTER
TROUBLE IN
BULT-IN POWER
or L703, L704
CHECK
J702 PIN 1, 2, 3
(12V) ?
NO
TROUBLE IN
X501
CHECK
X501
H. PULSE ?
NO
TROUBLE IN
U201
CHECK
U201(GM5020) ?
NO
TROUBLE IN
U201
NO
TROUBLE IN
U201
CHECK
U301, U302, U303
PIN 35
MEMORYCLK?
NO
YES
YES
YES
YES
YES
CHECK
L201, L202, L203
PULSE?