Legitimate sources for the updated schematic include:
The new schematic in her hands was different. It was elegant in its merciless clarity. A rework of the power planes rearranged the relationship between memory banks and clocking. Small resistors were replaced by tiny ferrite beads in the latest notes; a single ground return was split into three. Someone—she could tell by the stroke—had redrawn her own handwritten note into neater ink and had added something new: an overlay in a faint violet, labeled simply, “Fix: thermal cascade.”
. If it reads low, the Southbridge/PCH will never signal the main power supply to start. e93839 motherboard schematic updated
2x SATA III (6 Gbps), 1x SATA II (3 Gbps), 1x External eSATA 1x PCI Express x16 Gen 2.0/3.0, 1x PCIe x1 Core Sections of the Updated Circuit Diagram
Most boards carrying this label belong to the series. Below are the layouts for the most frequent versions: Dell OptiPlex 780 (Q45) Dell OptiPlex 7020 Go to product viewer dialog for this item. /9020 (Q87) HP ProDesk 600 G2 (Intel i5-6500) Go to product viewer dialog for this item. CPU Socket CPU Socket CPU Socket DDR3 (up to 16GB) DDR3 (up to 32GB) Intel Q45 Express Intel Q150 SATA Ports 4 x SATA 3.0 Gb/s SATA Ports SATA Ports 3-4 x SATA II/III 1x PCIe x16, 2x PCI 1x PCIe x16, 2x PCIe x1 1x PCIe x16 VGA, DisplayPort, eSATA VGA, 2x DisplayPort USB-C, DisplayPort, eSATA 3. Finding the Physical Schematic Legitimate sources for the updated schematic include: The
Bookmark this guide. Compare any downloaded schematic against the specifications in this article (look for the PCH_VRMPWRGD section on page 23 and the TPS2065 on page 45). If those pages are missing or mismatched – it is not the updated version. Keep searching, and happy repairing.
Verify that pressing the button pulls this signal down to 0V (Ground). Small resistors were replaced by tiny ferrite beads
Do you have a or oscilloscope on hand for testing?
The search for an "updated" schematic is not about fixing bugs in the drawing; it is about accuracy and revision control. Motherboard manufacturers often release multiple board revisions (Rev 1.0, 1.1, 2.0) without changing the silkscreen number. An old schematic might show resistor values for Rev 1.0, while your physical board is Rev 2.0 with different power management ICs.