Hp Pavilion 15 Black Screen and Flashing Caps Lock
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My laptop had a overheating problem, so I took it apart to clean the fans, they were pretty dusty, I didn't break any cables or anything, I took apart laptops for years. I put it all back together, ready to use my laptop. And Nothing.
My screen is black and has a constant led flashing, never stops. I didn't know a simple, teardown and put back together can cause a laptop to just die!
I need some help trying to fix it. Warranty is expired and I don't want to send it to HP support due to a price tag.
Every laptop I have taken apart has never had a issue, but if it's a HP product, you have to send it to them or throw it away to "fix" the problem.
If any possibility, can someone help me fix it?
- ROM
- CPU
- RAM
- GPU
20 Replies
Check if there is any pattern to the LED flashing (number of short/long flashes) this should indicate where the issue is
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It's just a constant flash, there's no pauses or patterns
If it were me, I would strip it down and reassemble it because something has gone wrong. I would visually check to see if there was any damage. I would start with a reassemble of only those parts needed to get something working. No need for: display (use external), hard drive, more than 1 stick of RAM, keyboard (use external), touchpad (don't need to get to BIOS) and battery (use mains adaptor). If it still does not work then at least you know what it is not.
CyrusPapyrus wrote:
I didn't know a simple, teardown and put back together can cause a laptop to just die!
Sounds like your knowledge is outdated. Manufacturers have changed notebook designs over the years so that many models are so highly integrated that what you describe became possible. That's why you should consult the appropriate manual before starting such an advanture.
But there is probably help available. You didn't disclose your model. That's why I don't know which manual is appropriate. A quick search revealed one manual for many HP Envy dv7 models and several different manuals for the different HP Pavillon dv7 models. Didn't finish to look up the search results as I don't know your model! But I can tell you that there doesn't exist a model called HP dv7. Your model designation is incomplete.
Please go to the web sites of HP support. It asks you for your model or serial so that it may present you the available support ressources. For your issue, you'll need to look for its service and maintenance manual. It is not presented for every language and every continental region. But in your language and your continental region, HP shall present this manual.
CyrusPapyrus wrote:
My laptop had a overheating problem,
What was the problem with overheating? How did you analyze and distinguish if any hardware had been damaged permanently or the system was able to bring down the system quick enough to prevent permanent damage?
CyrusPapyrus wrote:
so I took it apart to clean the fans, they were pretty dusty,
The idea might be ok. But with todays tight integration, you may want to look first in your service manual to determine how far to go with disassembling for which cleaning endeavor. But with your experience, you may have seen it also without such a manual. But if you detect that you need to go further, it is a must to consult the service manual. I'm not talking about the user manual. I'm talking about the service manual. It tells you for which steps you'll need which material before disassembling so that you may later assemble it again without doing any harm neither to the device nor to yourself. With your experience, you'll probably know already how to prevent harm to yourself. But for preventing harm to the device, you should consult the service manual. The designers have documented many relevant constraints. You won't find these details in the user manual, only in the service manual. The service manual doesn't come with the device and is available for download of the support site when configuring for appropriate language and continental region.
Not every OEM has such good service docu nor as easily accessible. With HP devices, you're in a good situation. And you may eventually find additional training videos of HP for their authorized service personal. I never tried that but have seen such links at least for some models.
My model was a hp envy dv7-7227cl, apparently people with this laptop have had overheating problems in the past, and may I add, they don't have a cooler for the GPU. The CPU has a fan but I cleaned it, the troubleshooting steps I did, was took out the ram and tried it, there was no change, tried a different cpu, no change, look for damage on the board, didn't find anything. So I'm kinda stuck on this one
CyrusPapyrus wrote:
My model was a hp envy dv7-7227cl,
So here is a list of manuals including service manuals. And I'm usualls refering to this service manual for your proceeding.
McMurray Computer Experts is an IT service provider.
CyrusPapyrus wrote:
My screen is black and has a constant led flashing, never stops. I didn't know a simple, teardown and put back together can cause a laptop to just die!
Generally there's a pattern to the CAPS-LOCK LED flashing. If the length of the pauses between blinks doesn't change, I guess that means it blinks one, then repeats. From memory, that sounds like a BIOS issue (or CPU).
As far as "I didn't know a simple teardown... to just die". Well, now you know.
more seriously, your laptop was already experiencing trouble which caused you to take this action. Perhaps it had already overheated too much and permanently damaged some component. Perhaps you mis-diagnosed the issue. Perhaps you damaged something during the teardown (static discharge). Or, perhaps you didn't correctly reassemble the unit.
Every laptop I have taken apart has never had a issue,
That means nothing. Either this machine had a more serious issue or you caused an issue. You may be experienced but that doesn't mean you can't make a mistake.
To say this is an issue because it's HP is ridiculous. That would mean nobody fixes HP machines.
It also contradicts your assertion that you're very experienced in repairing laptops (if you've never had to fix an HP before you haven't very much general experience OR, HP makes VERY good laptops since it's not common to fix them).
Make sure all ribbon cables are aligned correctly.
Some models use different screw lengths in certain places (can you maybe have used a long screw and pierced a board?).
I think I narrowed it down to a GPU chip failure, I replaced the CPU and ram, changed the CMOS, and did a hard reset. Everything else is fine, but since HP didn't put a cooling fan on it, it caused it to overheat and burn out. I turn the computer on and tested it, and the GPU burnt my finger not even a minute in.
Also, I put the screws in a sorter, so I don't think I used the wrong screws
CyrusPapyrus wrote:
I think I narrowed it down to a GPU chip failure, ... but since HP didn't put a cooling fan on it, it caused it to overheat and burn out.
Can't follow. Are you sure it was HP's fault? Or did somebody some service in contradiction to HP's requirements?
If you look at pages 11 for the schematic, and 24-27 for the explanations, you'll see the different part numbers listed for mounting and service. There different part numbers listed for the case of your setup with discrete GPU. As far as I understand, differences are addressed with different system boards, heat sinks and fans. Starting with page 77 up to page 87 describe that replacement procedure in further detail.
If I understand your case correctly, then you have a variant with discrete GPU. For that case, you're right that there is no separate fan for the GPU. But as you see in the description, the thermal aspects are covered by system board and heat sinks to support the CPU fan. There are some notes attached in the service manual where to spend special care. When ignoring such notes, you'll risk insufficient attachement of thermal pad heat sinks and system board resulting in wrong distances and inefficient cooling experience. And did you verify that you have the correct system board. It seems to me that these are designed also as a kind of additional heat sink or spread and that's one of several reasons, why they are different for the different CPU/GPU combinations.
CyrusPapyrus wrote:
I turn the computer on and tested it, and the GPU burnt my finger not even a minute in.
You turned on the mounted computer and tested it. How were you then able to access the GPU and burn your fingers as CPU and GPU are covered from every side and not accessible by your fingers when propoperly mounted?
I took out the board and set it on my desk, and tested it, the wire that leads to the power apdator, you can just take it out, I plug it all back in and try it.
CyrusPapyrus wrote:
I think I narrowed it down to a GPU chip failure, I replaced the CPU and ram, changed the CMOS, and did a hard reset. Everything else is fine, but since HP didn't put a cooling fan on it, it caused it to overheat and burn out. I turn the computer on and tested it, and the GPU burnt my finger not even a minute in.
Does the CPU heatsink have a section that passes over the GPU? Most do. There should be a thermal transfer pad between the heatsink and GPU.
No, my cooler only does the CPU, the GPU just sits there getting hot
AceOfSpades wrote:
Does the CPU heatsink have a section that passes over the GPU? Most do. There should be a thermal transfer pad between the heatsink and GPU.
Page 82 of the HP service manual of this model shows the case with dedicated GPU, including mounted photo with annotations for the screws. In case of dedicated GPU, this model has indeed one fan for the CPU and I'm not sure how many heat sinks. The photo on page 82 of the manual shows various components of heat sink for GPU, in addition to heat sink and fan for CPU. And as far as I understood, at least the system board serves as additional heat spread for CPU and GPU. Steps 2 and 2 on page 82 of that service manual are only applicable for the case of CPU with dedicated GPU. There is a clear contrast to cases with CPU with either integrated GPU or with UMA GPU, as shown on the photo on page 83 of the service manual.
CyrusPapyrus wrote:
No, my cooler only does the CPU, the GPU just sits there getting hot
Then it is not correctly mounted, see page 82 of the service manual for the case of CPU with dedicated GPU. Do you have the correct material and parts and did just forget to mount all components as shown on page 82? Or do you have the wrong parts and wrong material and those parts required did not yet arrive?
Then it is not correctly mounted, see page 82 of the service manual for the case of CPU with dedicated GPU. Do you have the correct material and parts and did just forget to mount all components as shown on page 82? Or do you have the wrong parts and wrong material and those parts required did not yet arrive?
There's no mount holes or a cooler for the GPU. All the parts are factory.
CyrusPapyrus wrote:
Then it is not correctly mounted, see page 82 of the service manual for the case of CPU with dedicated GPU. Do you have the correct material and parts and did just forget to mount all components as shown on page 82? Or do you have the wrong parts and wrong material and those parts required did not yet arrive?
There's no mount holes or a cooler for the GPU.
So you confirm what HP, Laki and I were writing. We didn't refer to a cooler nor fan for dedicated GPU. We all referred to thermal pad, heat sink and heat spread instead. So why didn't you mount it as specified by HP?
CyrusPapyrus wrote:
There's no mount holes or a cooler for the GPU. All the parts are factory.
Yes, system boards, thermal pad and heat sinks listed in the service manual are all original factory with their part numbers. And as you can see there, these part numbers differ according to CPU and GPU.
- There exist several CPUs for your product family.
- There exist several GPUs for your product family, some integrated with their CPU, some with shared UMA and some with dedicated GPU.
- So which CPU do you have?
- So which GPU do you have?
- So which system board do you have?
- So which heat sink and heat spread do you have?
The photos are clearly showing the differences for each category. There are three categories as I already wrote. But there are much more CPU/GPU combinations and associated system boards. It is generally not a good idea to use the correct system board with correct CPU and correct GPU but wrong fan, wrong heat sink and wrong heat spread. While there are more CPU/GPU combinations, I count 21 different and original factory part numbers of associated system boards on pages 77-78! The photos in the service manual are clearly showing where to attach the heat sink sections for the case with UMA GPU and where for dedicated GPU. Only for the case with integrated GPU, I can't see such heat sink sections.
CyrusPapyrus wrote:
No, my cooler only does the CPU, the GPU just sits there getting hot
Can you post a pic of the CPU and GPU area with the heatsink mounted?
This is what it looks like
Coming back into the discussion. Three observations on that photo. 1. The fan doesn't look as if its plugged in 2. About 3/4 way along and 2/3 of the way down on that picture is a device that has the remains of the blue/grey pad they employ and that will need a plate heatsink on it? 3. These days there are thermal pads between hot devices such as CPU and the metal heatsink with thermal pipes and, in my experience, these are often too far damage when they have been split apart for reuse such that reusing them can seriously degrade the heat conduction process. Best course of action is to clean off the pad remains and wipe very clean and use a grease to thermally connect parts. (Note the parts are machined very flat and so that grease will be a very thin coat such that any high temperature grease will do.)
Hp Pavilion 15 Black Screen and Flashing Caps Lock
Source: https://community.spiceworks.com/topic/2307598-hp-dv7-black-screen-caps-lock-led-constantly-flashing
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