Hi, i have a Samsung NEXUS S cellphone . i see a small black point on the LCD and after few days this black point expand and now is almost half of the LCD is covered by this black point and i can not use device at all. but touch screen is working and everything is fine, only a big black area is on top.

SOURCE: No picture

try chicking the horizontal section or vedio section...

SOURCE: Samsung HP-R5052 50 bottom hallf screen turns black

its the lower buffer card.. (y buffer lower board) they cost about $90.. i changed mine myself on my samsung hpr-4262 42 inch plasma.. pretty easy,, took approz 20 minutes.. the card has 3 ribbon cables and 3 other connectors and 1 screw.. removing all the screws out of the back pannel took the most time.. i found the repair manual for my tv on line for $13 (download PDF file) the manual had a trouble shooting section and what board to replace for each problem.. got the manual from here http://store.payloadz.com/ ordered the replacement board from www.partstore.com

good luck

troy

SOURCE: touch screen of samsung star doesn't work properly.

all u need to do is to improve ur calibration
go to
MENU>>SETTINGS>>PHONE SETTINGS>>CALIBRATION
improve ur calibration but prefer to tick with thum

SOURCE: Samsung LCD 40 inch LNT4061

Howdy,
It sounds like you have a Power Supply Board problem. The PSB is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.

Thanks for using FIXYA, big IRISH.

SOURCE: touch keypads do not work

yes...buy another touchpad...