Introduction
This guide starts with the unit back already off, but gives the additional steps needed to free the power supply:
- removing the rear plastic frame;
- clearing additional components away;
- replacing the power unit.
Photo Credit:
The composite photo here is made up of cropped and selected images from an EU End of Life form made public by HP for the Touchsmart 300.
[EndofLife] Product End-of-Life Disassembly Instructions
HP TouchSmart 300 PC series
EL-MF977-01
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You'll need to have the screen side laying down.
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Remove the nine screws labeled "CB" for the fans cover, with a flat head screwdriver. These are the 8 shown circled, plus 1 more in the central black area.
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After the CB screws are removed, lift up the fans cover. It will be tethered by connecting wires to the motherboard. Some repairs can be done without untethering, just shifting the cover.
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To remove the metal panel entirely (assumed below), you will have to unplug 2+ connectors from the motherboard. (More if you have a model with active external connectors like CATV, etc.) An alternative may be to detach the external-connector plate from the fans cover with the 3 screws label "IO-C", leaving just that small plate tethered.
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Follow Ashton's iFixIt instructions through his Step 10. Then we need to remove parts of the plastic frame, detailed next. Instructions that follow assume that the unit is screen-down with the lower edge and feet facing you.
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Underneath where the side trim was, remove the 6 silver-colored screws indicated. It is not necessary to remove the black screws.
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Removal of the rear plastic frame can now be done. Start at the lower “foot” edge, and press gently along the length of the mating, perforated plastic front frame, while pulling gently upward on the rear frame. There are 3 hooks along the length of the lower edge to detach by this process. Then angle it up and remove the top edge last.
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The power supply is now exposed at the lower center, but additional items must be cleared away.
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Begin with the disk drive enclosure to its left, which has a wire bale handle. Unscrew the single spring-mounted captive screw (indicated by a screwdriver symbol), and pull up the handle. Prop the drive at an angle (e.g., with a screwdriver handle). It is not necessary to remove the drive.
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The power supply is mechanically loose. To finish removal, first detach connector P1 from the motherboard as shown (pry at alternating ends of seam with thin screwdriver while initially pressing the part of black central latch closest to you).
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Also detach white connector P3, that runs under the fan (and note clip) to the circuit board protruding from under the DVD drive cage. Again, a thin screwdriver can help.
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When reversing these steps to install a new power supply, first arrange the power supply’s cables in the channel beneath the supply so that the supply sits snugly. Reinstall the 3 screws. Only then attach P1, P2, and P3. Before remounting the fan, route the P3 cable under its clip.
When reversing these steps to install a new power supply, first arrange the power supply’s cables in the channel beneath the supply so that the supply sits snugly. Reinstall the 3 screws. Only then attach P1, P2, and P3. Before remounting the fan, route the P3 cable under its clip.
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