hello,
i have an hp dv6 laptop with ati 216-0729042 graphic and 215-0674034.i replaced the ati 216-0729042 chip now display comes but blank no characters on the lcd.check lcd and lcd cable.this has onboard graphic memory 64mb.
pls advice where the issue is.

Do You have image on extrnal monitor?
If it true, the 216-0729042 not fit correctly, rework it again.

no on external monitor same problem but the monitor signal shows.but blank

What do You mean "now display comes"?

Are you sure that the new chip? Not reballed?
Check the BIOS post codes.

check PEG-capacitors resitance to gnd. from both sides.

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what should they be in ohms or kohms.i tried to see the signal on the oscilloscope but i guess you need atleast 250mhz .i use a 100mhz digital.thanks lamo will check and tell you.