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Laptop Display issue even after replacement cable?

kman1706 Avatar
2y, 4m agoPosted 2 years, 4 months ago
My sisters HP G62 was having an issue where by weird artifacts such as white lines, freezing of the display etc would occur when in use. A quick search online revealed that others had this same or similar issue caused by a damaged display cable from the display to the motherboard. Hooking up an external display worked fine.
So I ordered a new display cable from ebay and set about taking apart the laptop to install the new adapter. I cleaned out the CPU heat sink which was clogged with a ton of dust etc and applied new thermal paste. Removed the old display cable and put the new one in. However, when I go to test it I now get a white screen with occasional glimpses of windows. I connected up a external display and that seemed to work fine.
Could this be an issue with the display itself and not the cable? Or could the cable I bought be faulty or something completely different?
Also, is it normal for the laptop fans to spin up and lights to flash when I press the power button, then for everything to power down and then start up again like normal and boot? I don't remember it doing this before.
Thanks.
kman1706 Avatar
2y, 4m agoPosted 2 years, 4 months ago
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Responses/page:
#1
Taking two attempts to boot will almost certainly be some option you have selected in the bios failing the first time and then the default is selected automatically the second time as a backup attempt and it then works. For example if you set the pc to overclock it will try once to boot and if it can't it will try with the default values (not overclocked). Could be ram timings or settings in bios also, anything really.
#2
MIDURIX
Taking two attempts to boot will almost certainly be some option you have selected in the bios failing the first time and then the default is selected automatically the second time as a backup attempt and it then works. For example if you set the pc to overclock it will try once to boot and if it can't it will try with the default values (not overclocked). Could be ram timings or settings in bios also, anything really.

Ah yes, I did remove the CMOS battery so it may have disrupted a saved bios setting.
#3
Double booting is fine, some laptops tend to power down for a second after the initial power up.

You may have not noticed it before because you may have not been looking for it, however now you have problems so it may suddenly stand out, but don't worry about it. Your problem is still with your display and nothing else from what I can gather.

However I can't be of much help with your original problem. Sorry. :(
#4
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help
#5
Crusader777
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help

Yup, Getting the same issue with the original cable so figured it must not be a fault with the cable.
#6
White lines appearing and display freezes are not going to be an issue with the screen itself. The G62 models have been known to suffer from solder cracking on the GPU *(often referred to as "The NVIDIA Problem", it also affected many ATI chipsets). This is a progressive issue that in many cases occurs years after purchase of the laptop, and will continue to get worse. This can usually be solved with a procedure called "Re-Balling" (replacing the solder connectors completely).

A cheaper (because it is easier to do for amateur techs), but only temporary solution is called "Re-Flowing". This is generally done without removing the GPU, and involves heating up the soldered area to melt and reset the solder. This cures the problem in the short term, but it will occur again, because the problem was the quality of solder being used a few years back.

Another issue which has been known to affect many of the G62 range is over heating caused by poor air circulation. Worth checking the air inlet and fan isn't in any way restricted by dirt/debris. Though, I am afraid it is far more likely to be the GPU issue. This also affects booting issues (removing the CMOS battery in a laptop will not affect the system because the defaults in the BIOS are specific to the on-board hardware), and does eventually lead to a system which will completely stop working.
#7
kman1706
Crusader777
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help

Yup, Getting the same issue with the original cable so figured it must not be a fault with the cable.

The problem seems to have got worse or broke then since swaping ? seems like a conection problem if your getting the odd glimps of windows I'd have a look at the terminals before sending it for repair. Check your ram is in and try one at a time if you have two , that can mess with screens but you say it works through external display so cant be gpu either ?

Edited By: Crusader777 on Jul 20, 2014 21:21
#8
dlee1
White lines appearing and display freezes are not going to be an issue with the screen itself. The G62 models have been known to suffer from solder cracking on the GPU *(often referred to as "The NVIDIA Problem", it also affected many ATI chipsets). This is a progressive issue that in many cases occurs years after purchase of the laptop, and will continue to get worse. This can usually be solved with a procedure called "Re-Balling" (replacing the solder connectors completely).

A cheaper (because it is easier to do for amateur techs), but only temporary solution is called "Re-Flowing". This is generally done without removing the GPU, and involves heating up the soldered area to melt and reset the solder. This cures the problem in the short term, but it will occur again, because the problem was the quality of solder being used a few years back.

Another issue which has been known to affect many of the G62 range is over heating caused by poor air circulation. Worth checking the air inlet and fan isn't in any way restricted by dirt/debris. Though, I am afraid it is far more likely to be the GPU issue. This also affects booting issues (removing the CMOS battery in a laptop will not affect the system because the defaults in the BIOS are specific to the on-board hardware), and does eventually lead to a system which will completely stop working.

Thing is though this specific G62 uses the intel HD integrated graphics.
#9
Crusader777
kman1706
Crusader777
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help

Yup, Getting the same issue with the original cable so figured it must not be a fault with the cable.

The problem seems to have got worse or broke then since swaping ? seems like a conection problem if your getting the odd glimps of windows I'd have a look at the terminals before sending it for repair. Check your ram is in and try one at a time if you have two , that can mess with screens but you say it works through external display so cant be gpu either ?

Yeah, seems to have got worse since I opened the laptop up and swapped the cables. Do you think I should purchase a new LCD panel?
#10
kman1706
Crusader777
kman1706
Crusader777
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help

Yup, Getting the same issue with the original cable so figured it must not be a fault with the cable.

The problem seems to have got worse or broke then since swaping ? seems like a conection problem if your getting the odd glimps of windows I'd have a look at the terminals before sending it for repair. Check your ram is in and try one at a time if you have two , that can mess with screens but you say it works through external display so cant be gpu either ?

Yeah, seems to have got worse since I opened the laptop up and swapped the cables. Do you think I should purchase a new LCD panel?

Repair shop , I wouldn't go buying a new screen until you know exactly what the issue is.
#11
Crusader777
kman1706
Crusader777
kman1706
Crusader777
And have you put the original ribbon/cable back on and is there a picture again ? An original ribbon/cable would help

Yup, Getting the same issue with the original cable so figured it must not be a fault with the cable.

The problem seems to have got worse or broke then since swaping ? seems like a conection problem if your getting the odd glimps of windows I'd have a look at the terminals before sending it for repair. Check your ram is in and try one at a time if you have two , that can mess with screens but you say it works through external display so cant be gpu either ?

Yeah, seems to have got worse since I opened the laptop up and swapped the cables. Do you think I should purchase a new LCD panel?

Repair shop , I wouldn't go buying a new screen until you know exactly what the issue is.

Alright, good plan thanks mate.
#12
Given that Intel HD graphics were not affected by the issue, I would suggest your next port of call is to test the RAM. System memory (when used as the graphic memory for integrated GPUs) can cause a range of on screen artifacts. HP have for a number of years had a fairly good self test in the BIOS. But you should give your memory a good workout, MemTest86 had often been my fall-to test when I haven't had my Micro2000 diagnostic kit to hand.

http://www.memtest86.com/
#13
dlee1
Given that Intel HD graphics were not affected by the issue, I would suggest your next port of call is to test the RAM. System memory (when used as the graphic memory for integrated GPUs) can cause a range of on screen artifacts. HP have for a number of years had a fairly good self test in the BIOS. But you should give your memory a good workout, MemTest86 had often been my fall-to test when I haven't had my Micro2000 diagnostic kit to hand.

http://www.memtest86.com/

Would a memory issue have a effect on an external display however? When the laptop is connected to a external display it works perfectly fine and is usable.
#14
This somewhat depends upon whether the internal and external displays are operating simultaneously, and if the same corrupt memory addresses are being used by the system for external display as well as internal. With hardware based problems, everything is a matter of deduction, and reducing the issue to find which item is at fault. Generally, my process (when I was an systems engineer - I'm in network and security now) from what you have described would have been the following:

Step 1. Running the system with an external monitor in mirror mode (ie showing the same image on both screens), put the system on a burn-in diagnostic test. The would throw up any corruptions in the memory, CPU, or GPU. In addition, it would push the CPU to ensure it wasn't an issue caused by heat, or static damage.

Step 2 would depend on what the diagnostics turned up, but assuming memory, CPU and GPU came back clean, then I would be opening the device up to check the internals. It's easier for engineers to test things like cables and screens, because stock means we can swap out without having to buy one on the off chance.

But you have tried an additional cable, though it would appear that the screen has gone from white artefacts to virtually all white. Only now that is happening with both cables (if I read this right). That could potentially be a damaged connection, more often at the screen end than the motherboard end (screen connector is more delicate), but both are possible. ( On a side note, Laptop screens default to white and power to black (the opposite of the old CRT monitors), so if the screen is showing black during boot up and then turns white, it is powered properly and receiving some signals, if it is white all the way through boot up, it is receiving power, but no signal).

The laptop starting, cutting out and restarting would concern me. Sometimes this is indicative of a fracture in the power rail on the motherboard. It can also be a failing capacitor that causes it. Often, in these cases, the issue is more prominent when the machine booting up without having warmed up from running for a decent period of time. If after the system has been used for a couple of hours, you shut down and then turn the computer back on straight away and it doesn't do the stalled boot, it is usually a physical fault developing on the system board.

However, the on, off, on when switching on is also another symptom of the GPU issue I mentioned before. Now I realise you say it had Intel's HD graphics, but there is (by virtue of the fact that you identified the air intake/fan was clogged up), the possibility that the CPU/GPU has been running at higher than nominal temperatures and caused fracturing in the solder joints.

The real question is how much you are prepared to attempt yourself. I suspect that you may be best looking at one of the no-repair, no-fee services if a memory scan throws up no issues.
#15
dlee1
This somewhat depends upon whether the internal and external displays are operating simultaneously, and if the same corrupt memory addresses are being used by the system for external display as well as internal. With hardware based problems, everything is a matter of deduction, and reducing the issue to find which item is at fault. Generally, my process (when I was an systems engineer - I'm in network and security now) from what you have described would have been the following:

Step 1. Running the system with an external monitor in mirror mode (ie showing the same image on both screens), put the system on a burn-in diagnostic test. The would throw up any corruptions in the memory, CPU, or GPU. In addition, it would push the CPU to ensure it wasn't an issue caused by heat, or static damage.

Step 2 would depend on what the diagnostics turned up, but assuming memory, CPU and GPU came back clean, then I would be opening the device up to check the internals. It's easier for engineers to test things like cables and screens, because stock means we can swap out without having to buy one on the off chance.

But you have tried an additional cable, though it would appear that the screen has gone from white artefacts to virtually all white. Only now that is happening with both cables (if I read this right). That could potentially be a damaged connection, more often at the screen end than the motherboard end (screen connector is more delicate), but both are possible. ( On a side note, Laptop screens default to white and power to black (the opposite of the old CRT monitors), so if the screen is showing black during boot up and then turns white, it is powered properly and receiving some signals, if it is white all the way through boot up, it is receiving power, but no signal).

The laptop starting, cutting out and restarting would concern me. Sometimes this is indicative of a fracture in the power rail on the motherboard. It can also be a failing capacitor that causes it. Often, in these cases, the issue is more prominent when the machine booting up without having warmed up from running for a decent period of time. If after the system has been used for a couple of hours, you shut down and then turn the computer back on straight away and it doesn't do the stalled boot, it is usually a physical fault developing on the system board.

However, the on, off, on when switching on is also another symptom of the GPU issue I mentioned before. Now I realise you say it had Intel's HD graphics, but there is (by virtue of the fact that you identified the air intake/fan was clogged up), the possibility that the CPU/GPU has been running at higher than nominal temperatures and caused fracturing in the solder joints.

The real question is how much you are prepared to attempt yourself. I suspect that you may be best looking at one of the no-repair, no-fee services if a memory scan throws up no issues.

I'll have a go and run a memory test, if nothing shows up I may take it into a repair shop to figure out whats wrong with it and take action from there. I have a feeling its the actual LCD itself and I don't think the strange power down then power up is anything to be concerned about as it works without issue once booted. I probably didn't notice it before or it may be trying to boot from another device as I did remove the cmos which could have caused a cmos settings reset.

Thanks for this information, a helpful read.

Edited By: kman1706 on Jul 21, 2014 19:20

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