New LED Laptop Display Not displaying correctly

[mohavepc]

Replaced a Cracked LED (no not a misprint it is a LED) display on a newer Samsung laptop. the issue is that when powered on the LED does not display correctly. I have reseated and checked all the connections to no avail. I am not sure if it is a Display issue or perhaps a cable issue. Please look at the screenshots and you will see what I mean. I plugged in an external monitor and have a beautiful picture so I don't think it is the graphics proc. Image 0836 is the external and 0837 is the LED. Should I contact the seller and see about a replacement?

 

[VistaKing]

Could be the LED screen itself . The cable comes with the LED replacement or are using the cable from the old screen ?

 

[indianacarnie]

As VistaKing so adroitly mentioned it, could be the cable. If you've checked and rechecked all connections and its still under warranty, personally I'd ask for a replacement. I replaced a screen not too long ago and all problems I had were traced to a faulty cable. (My fault too as I had squished the cable in the hinge as I put the machine together. Replaced the poor thing and the machine is dancing in the street. Lesson learned on my part.

 

[mohavepc]

Yes drivers are updated, Cable is original but I am ordering one as a cheap test. no word from the seller yet but we will see. this customer is wanting it done asap of course. sucks being in a small town. the nearest part is 250 miles away and they only ship post. well they ship ups too but for a huge cost.

*edit*
Seller has asked me to ship it back for testing. I will most likely order another one from a different supplier as I have had issues with this company before. once the new cable and LED/Lcd arrive I will update or mark as solved.
Thanks
Herb

 

[mohavepc]

ok "New Cable", "New LCD" and still the same issue. I'm stumped unless the motherboard is toast. but if so why is the output to an external screen so perfect? any Ideas"

*edit*
It should be noted that the display on Both "new" screens looks like color separation or 8bit color without a hard drive, cd-rom/dvd, and 2GB memory. The Bios screens look just as awful on the led/lcd and fine on an external.

*edit 2*
New drivers direct from Samsung, No difference. I am at my whit's end.

 

[PeaB4YouGo]

check the plug on the vid card. There may be a pin not in use by the external monitor that the LED uses that is bent. Once you've ruled out the cable, that's the next thing to look at.

 

[mohavepc]

I am using the vga plug on the side of the laptop for the external so no it's not the same plug. I will look at the plug in a little bit.

*edit*
looked at plug at looks fine. no bent pins and no broken solder points. checked with a multimeter and there is connectivity between pins and opposite side of Mobo. *sigh* looks like a mobo after all. she could have bought a new pc by now.

 

[mohavepc]

Well Now I am Truly stumped. New Mobo, New Cable, New LED/LCD, New case (old was bent), new Keyboard/Mobo mount (yes bent on a corner where it hit the ground). New mobo means new Vid chip and i5 processor. (as they are soldered on not in sockets).

SAME FREAKING ISSUE :banghead::banghead::banghead::mad2d):banghead: and a few other choice words later.
I don't know I am at a total and utter loss. Hard drive makes no diff as I tried booting without the drive using a Linux cd. Memory makes no diff as I have changed that out to with two test sticks 8gb (also tried a single 2gb).

 

[alphanumeric]

I'm thinking its a connection issue. The cable to the monitor may not be connected correctly to the motherboard header. Please don't take this the wrong way as I don't know you or how tech savvy you are, but how much experience do have in doing these type of repairs? I ask because there is a trick to latching and unlatching some of the motherboard cable headers. A lot of them have a little bar you raise to release the cable and then lock it in again. Others have two small tabs on the ends you move to release the cable. This makes them zero insertion force type connectors. If you don't know how these connectors work you end up pulling on the cables to disconnect them and then pushing hard on them to reinsert them.

 

[mohavepc]

I'm thinking its a connection issue. The cable to the monitor may not be connected correctly to the motherboard header. Please don't take this the wrong way as I don't know you or how tech savvy you are, but how much experience do have in doing these type of repairs? I ask because there is a trick to latching and unlatching some of the motherboard cable headers. A lot of them have a little bar you raise to release the cable and then lock it in again. Others have two small tabs on the ends you move to release the cable. This makes them zero insertion force type connectors. If you don't know how these connectors work you end up pulling on the cables to disconnect them and then pushing hard on them to reinsert them.

I won't take it the wrong way because as you say you don't know me. I have a computer repair shop in a small town in Arizona. We are the only one out of 8 that does laptop repair. I have been doing computer repair since 1985 and I quite understand zif connections. this laptop is using standard albeit small 26 or 28 pin connector on the mobo end and a standard flat manifold on the led/lcd side with the stupid sticky tape style lock, they are definitely not zif connectors.

What's bugging me is that 2 different screens, one different cable and one different motherboard and still this funky issue. Looks like crap on the native screen and is bright and clean on an external monitor pugged into the vga output on the laptop. Bios screen, Linux disc or windows makes no difference. Drivers for windows are latest from Samsung but that should have zero effect on the bios or Linux screens. (Not the bios itself unless two different mobos have the same bios issue).

 

[alphanumeric]

OK, you obviously have done this before. You are correct if its distorted on the BIOS screen its not a driver issue as no drivers are loaded or required for that screen. When you swapped out the screen did you swap out the whole upper clam shell half or just the screen section itself? Maybe its the backlight or light diffuser or what ever its called?

 

[mohavepc]

New clamshell back as the old was bent from being dropped. Essentially all that's old is the hard drive, dvd drive, usb daughterboard, audio daughterboard, card reader daughterboard and display front plastic cover. Has been tested with each and all disconnected. It is essentially a new machine and that's what freaking bugs me. I just cannot fid a reason for this to be going on. I personally would have thought cable first as it is distorted right from boot with the vga generic drivers out of bios being loaded immediately, plus the fact the vga output on the mobo works fine.

I just don't know now. I tried the old cable for giggles without plugging in the camera thinking it could have something to do with it since the camera leads merge with the video cable but alas no luck.

 

[alphanumeric]

New clamshell back as the old was bent from being dropped. Essentially all that's old is the hard drive, dvd drive, usb daughterboard, audio daughterboard, card reader daughterboard and display front plastic cover. Has been tested with each and all disconnected. It is essentially a new machine and that's what freaking bugs me. I just cannot fid a reason for this to be going on. I personally would have thought cable first as it is distorted right from boot with the vga generic drivers out of bios being loaded immediately, plus the fact the vga output on the mobo works fine.

I just don't know now. I tried the old cable for giggles without plugging in the camera thinking it could have something to do with it since the camera leads merge with the video cable but alas no luck.

I do believe the signal that feeds the VGA port is a different signal from the one that goes to the built in LCD display. Analog versus digital. I've seen situations like this where one worked OK and the other didn't. Are you sure you have the correct replacement for the LCD screen? You've swapped everything out so I'm at a lose for suggestions at this point.

 

[alphanumeric]

The last time I saw a screen that looked like that was after a friend used alcohol to clean his screen. That screen was soft to the touch almost like jello and didn't have a hard glass cover. Eventually it went back to normal as the alcohol evaporated.

 

[mohavepc]

First screen I ordered by model number off the laptop even though I know better but it matched what was in the machine. I RMA'd that one and ordered another through a different supplier using the model number off the screen itself. no chemicals have been in contact with this screen as I have the plastic shield film they tape on them still in place. it looks like the old 8bit vga output that is trying to show millions of colors. I don't have another laptop to see if perhaps I have indeed gotten two bad led/lcd's. I am not liking these newer displays as I don't think the quality nor the display quality is up to par with the older standard lcd with the florescent lighting.

 

[A Guy]

I'm a TV tech, and if I saw something like that after changing a panel, I'd suspect the panel, then the LVDS cable, then I'd check the settings in the main board. TV's often have settings for panel type. 8 bit, 10 bit. VESA, PDP, etc. Since this is a laptop, I'd suspect the panel is not the same, it's possible a cable issue, but it's unlikely to display like your pictures. I realize this is not much help for you, but that's my thoughts. A Guy

 

[alphanumeric]

First screen I ordered by model number off the laptop even though I know better but it matched what was in the machine. I RMA'd that one and ordered another through a different supplier using the model number off the screen itself. no chemicals have been in contact with this screen as I have the plastic shield film they tape on them still in place. it looks like the old 8bit vga output that is trying to show millions of colors. I don't have another laptop to see if perhaps I have indeed gotten two bad led/lcd's. I am not liking these newer displays as I don't think the quality nor the display quality is up to par with the older standard lcd with the florescent lighting.

Take the plastic film shield off and see what happens.

 

[mohavepc]

[/QUOTE]

Take the plastic film shield off and see what happens.[/QUOTE]

ummmmm sorry did already. Nice thought . but not the issue. 2 diff lcd's 2 diff mobo's and 2 diff cables. makes absolutely no sense.

 

[mohavepc]

I'm a TV tech, and if I saw something like that after changing a panel, I'd suspect the panel, then the LVDS cable, then I'd check the settings in the main board. TV's often have settings for panel type. 8 bit, 10 bit. VESA, PDP, etc. Since this is a laptop, I'd suspect the panel is not the same, it's possible a cable issue, but it's unlikely to display like your pictures. I realize this is not much help for you, but that's my thoughts. A Guy

Thanks A Guy but the second display matches by model number, the first display was off by last two digits but was assured it would work. the first display was rma'ed without question due to the model number. I believe the LED/LCD is correct according to model.

 

[alphanumeric]

2 bad displays?