Re: Dell G7 7790 LCD backlight issue
The board has the same result no matter if it's battery power only, charger only, or charger + battery.
We have found shorts in the following locations that appear as if they could be related to the GPU.
C5248, C5249, C5252, C5253, and C5250 are all short to ground. So it would seem there is a short somewhere related to +1P0V_GPU based on our schematic.
It is the vulcan board.
We will test as you requested as well.
RepTech
New Member
Last Activity: 11-12-2024, 07:08 PM
Joined: 03-18-2022
Location: Kansas
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Re: Dell G7 7790 LCD backlight issue
Your schematic seems to be better than the one I'm using. Everything in the one I'm using is exactly opposite of the board. It's accurate thus far as long as I remember its backwards.
The fuse is good.
As I stated in the last post the board will not even post now yet we have done nothing to it other than test without power connected prior to this new issue....Leave a comment:
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Re: Dell G7 7790 LCD backlight issue
I'm sorry, should have been more specific. I have already re-connected the battery and attempted to boot. At this point it lights the power light and caps lock on solid, no response or video output of any kind. I can not turn caps lock off.
The CPU and GPU both heat up, but the fans do not power up at all. If I hold the power button down to try to power it off it will power off and does kick the fans on right before it powers off.Leave a comment:
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Re: Dell G7 7790 LCD backlight issue
Well, after the weekend of the laptop sitting it will no longer power up properly.
It sat all weekend, still in the laptop, with the internal battery disconnected. Now today it will power on but only lights the power button and caps lock. No post, no fan spin, nothing. I'm starting to think these G7 7790's are junk builds by Dell based on what I've read about them.
We've done the typical of removing and testing memory modules, etc, but same issue. Perhaps the board has more issues than originally thought.
...Leave a comment:
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Re: Dell G7 7790 LCD backlight issue
The board side connector is 40 pins and those are connected together....Leave a comment:
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Re: Dell G7 7790 LCD backlight issue
I haven't had a chance to do anymore testing on this as of yet cause I've been out of the office. I really appreciate the help and will post more once I've tested.
I do have the schematic for this board that works with FlexBV. I managed to find it last night.Leave a comment:
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Re: Dell G7 7790 LCD backlight issue
It is 30 PIN.
I don’t see any markings on the LCD connector of the display. If you mean the model info it is as follows:
N173HCE-E3A Rev. C1
09C1BHY99B50001
HP H/W:C1
HP P/N:L43245-JG1
CT:CHRTK01K6CR04Y
This is off the replacement screen. Original is also N173HCE-E3A Rev. C1
Both are InnoLux displays.
Thank you!Leave a comment:
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Dell G7 7790 LCD backlight issue
Does anyone have an experience with backlight issues on the Dell G7 7790 laptops?
I have one in my shop that was worked on by another shop after the screen was broken.
The other shop replaced the screen then told the customer the lcd cable was the issue and they couldn't repair it.
We have tried a second replacement and lcd cable just to be sure it's beyond the obvious issues. The laptop does work perfectly other than the backlight. It works great on external monitors and the lcd is working except for the backlight not being lit.
We... -
Re: New Members - please post your introductions here
Hello everyone!
I own a computer/electronics repair shop in Kansas. I honestly can't believe I've never found this forum before now. I'm looking forward to being part of the community. Have a great weekend!Leave a comment:
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