screen yellow

i have a compaq presario CQ62 laptop and the screen broke :(

i paid  £90 for a new screen when i recived it, it  shuddered and had yellow lines on the screen only noticeable on certain

colour backgrounds white grey ect ect...  so i sent it back to see if the gentleman who fixed the screen could locate the fault he seemed to fix the shuddering as it has only shudderd once since, but anyway he has not been able to fix the yellow lines and at the top of the screen on a certain line it is pixelated? ie the colour are lets say 5-6 little dots away from where it should be..

any help would be appreciated

i pluged my laptop into the t.v via HDMI and it does not show on the t.v but does on the laptop then when removing the HDMI cable from the HDMI port on the laptop the screen went black with lines appering accross the top going horizontal and at the top left of the screen it meets to more lines going vertical down the screen :( that have not dissapeared even though the pc has been restarted

p.s when restarted the screen is still black and still have the lines

thanks for a quick responce

ok thanks for your help i can only use the laptop using an external display now is it easy ro replace a screen as i may take on the challange myself depending on the difficulty and how easy it is to catch a component and it breaking?

many thanks andrew

ok thanks watched a video and it looks easy so might have ago see if I can sort it out :)

many thanks Andrew :)

did not want to chance it it mate sorry for been a dead hope... just did not have the nerves