IBM L150 Service Manual page 35

4.U203-DATA OUTPUT
Measured DCLK DVS, DHS (pin 117,116 from
U203 ) Is the waveform ok?
DCLK around 40 MHz , DVS=60.09Hz , DHS
around 80 KHz ?(refer to input signal=
640x480@60 Hz 31k, and LED is Green)
Check U203 GM5115 /2115
Signal output ER0~7,EG0~7,EB0~7
OR0~7,OG0~7,OB0~7
Is the waveform ok ?
Check CP501—CP511 or
LP501—LP509 or RP201 or RP202
or Q501 or Q502
Signal output Is the waveform ok ?
OK
OK
OK
NG , no transition
Replace GM5115 /2115
(U203) or replace Main
board.
If MainBoard being replace ,
please do the DDC – content
reprogrammed
Replace CP501—CP511 or
LP501—LP509 or RP201 or RP202
or Q501 or Q502
replace MAINBOARD.
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IBM 15" Service Manual