Hello
I've got a 820-2879 board that gives me a picture but no backlight and I know it's a board related problem.
I have no power on output at q9806.
On pin 2 at q9807 , BKLT_PLT_RST_L, i have 0 volt and i tracked it to PCIE_RESET_L that also is 0 volt and comes from U1400 (PCI EXPRESS)
What I think may cause the problem is that I have 2.4 volt on PP3V3_S0_MCP_PLL_HVDD. I think that line is powering the PCI EXPRESS chip and should be 3.3v.
At page 22 you see where its created and I have 3.3v in at R2592 and 3.42v at C2599.
I feel that my knowlege in reading schematics is low som i'm stuck here.
Please help!
I've got a 820-2879 board that gives me a picture but no backlight and I know it's a board related problem.
I have no power on output at q9806.
On pin 2 at q9807 , BKLT_PLT_RST_L, i have 0 volt and i tracked it to PCIE_RESET_L that also is 0 volt and comes from U1400 (PCI EXPRESS)
What I think may cause the problem is that I have 2.4 volt on PP3V3_S0_MCP_PLL_HVDD. I think that line is powering the PCI EXPRESS chip and should be 3.3v.
At page 22 you see where its created and I have 3.3v in at R2592 and 3.42v at C2599.
I feel that my knowlege in reading schematics is low som i'm stuck here.
Please help!