Subject is a blank screen issue in HP Envy 17-3290NR 3D version laptop with motherboard Louis V1.1 6050A2489901 MB-A02. Production year is 2012. This one is a 2nd hand motherboard which I could use it for few months only. Suddenly no output from the internal display and also no signal from HDMI port then Windows out of order after few boots.
Caps lock working normally and no HP's caps-lock warning blinks. Making a hard reset and replacing the RAM sticks or using different slots didn't help.
Fans are spinning. Blindly could install windows11 and got the device manager by print screen+mspaint and also got some error log files by pnputil all blindly (I will post them here). In device manager there is no line about the dedicated GPU AMD HD7850M, six device drivers showing couldn't be installed. My dedicated GPU is a PCIe device but “PCI Simple Communications Controller not installed” cannot detect the GPU. There is no other GPU in this motherboard to test more. One more trouble, after each booting file corruption happening in the boot drive SSD. Needed to repair the SSD in another computer and move it back again.
I replaced a new bios with the same .bin data. (I tested with old bios again, no change in the result). I took the motherboard to a professional they replaced HM76 chipset chip, AMD HD7850M GPU chip and 4 Graphic Ram chips with the brand new one. Also they transferred few other components from my first old motherboard which I can point out which ones are they.
Still no graphics output. Only difference motherboard heat increased and this time heat coming from every part.
I have no battery, I am using the power adapter only.
I measured the voltages on the pads of the motherboard:
Back side: all the pads show 19.3V (PAD# 6210,6753,6310,6600,6601,6700,6015,6110 which all voltages matching with schematics.)
Front side (component side): PAD#:
6121…3.35V
6135…3.34V
6100…3.37V
6150…5.10V
6970…1.84V
6200…1.52V
6201…1.52V
6220…1.52V
2013…5.09V
6940…1.06V
6950…0.96V
6510…5.10V
All these look like in normal range but;
PAD6300 and PAD6301 show 1.06V (must be in the 1.5V range?)
PAD 6750 and PAD6751 show 0.90V (I couldn't find how much V is the normal?)
What to check more, what to diagnose,
(I don't have an IR camera for heat detect)
Thank you.
Caps lock working normally and no HP's caps-lock warning blinks. Making a hard reset and replacing the RAM sticks or using different slots didn't help.
Fans are spinning. Blindly could install windows11 and got the device manager by print screen+mspaint and also got some error log files by pnputil all blindly (I will post them here). In device manager there is no line about the dedicated GPU AMD HD7850M, six device drivers showing couldn't be installed. My dedicated GPU is a PCIe device but “PCI Simple Communications Controller not installed” cannot detect the GPU. There is no other GPU in this motherboard to test more. One more trouble, after each booting file corruption happening in the boot drive SSD. Needed to repair the SSD in another computer and move it back again.
I replaced a new bios with the same .bin data. (I tested with old bios again, no change in the result). I took the motherboard to a professional they replaced HM76 chipset chip, AMD HD7850M GPU chip and 4 Graphic Ram chips with the brand new one. Also they transferred few other components from my first old motherboard which I can point out which ones are they.
Still no graphics output. Only difference motherboard heat increased and this time heat coming from every part.
I have no battery, I am using the power adapter only.
I measured the voltages on the pads of the motherboard:
Back side: all the pads show 19.3V (PAD# 6210,6753,6310,6600,6601,6700,6015,6110 which all voltages matching with schematics.)
Front side (component side): PAD#:
6121…3.35V
6135…3.34V
6100…3.37V
6150…5.10V
6970…1.84V
6200…1.52V
6201…1.52V
6220…1.52V
2013…5.09V
6940…1.06V
6950…0.96V
6510…5.10V
All these look like in normal range but;
PAD6300 and PAD6301 show 1.06V (must be in the 1.5V range?)
PAD 6750 and PAD6751 show 0.90V (I couldn't find how much V is the normal?)
What to check more, what to diagnose,
(I don't have an IR camera for heat detect)
Thank you.
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