IBM L150 - Page 35

IBM 15” Service Manual
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)
NG , no transition
OK
Replace GM5115 /2115
(U203) or replace Main
board.
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
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.
OK
http://www.wjel.net