Maintenance PVM-2130QM

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Revision as of 16:27, 2 May 2020 by Ultrageranium (talk | contribs) (Focus)
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Some notes taken while trying to do some maintenance on this fine 1986 CRT monitor :)

The Sony ProFeel Pro (1986) monitor, commonly known as the Sony Cube, represents a high point in the developmental history of monitor technology and product design. This monitor incorporated the bright high-quality Trinitron screen (the brand name for a product line of aperture grill-based CRT screens) that had been developed during the 1960s, and which then underwent successive improvements. The definitive cuboid form of the Sony ProFeel Pro (1986) had not previously been a feature of monitor casing design in Sony’s range. Formerly, the dimensions of the back edge of the monitor had not been identical to the front; instead, the casing at the rear of the screen had been visibly narrower. In contrast, and distinctively, however, the Sony ProFeel Pro articulates the quintessential cuboid form, with its operational components removed from view and suspended within the back frame. The cuboid shape of the monitor casing facilitates the stacking of monitors, while also functioning as a grip-bar, which assists in carrying. These practical attributes of the design substantially enhance the utility and versatility of the equipment for exhibition purposes. (source: https://www.theblock.art/equipment/sony-cube-21/)

Opening the thing

PVM screws.jpg

Looking at the back of the monitor or quickly browsing through the service manual exploded views gives an overwhelming feeling of stepping into the land of a million screws, but in fact, only 5 needs to be removed and it's pretty easy.

PVM inner legs.jpg

You can open by sliding the rear back (it can be a bit stuck, fear not, no surprise hooks or locks, just pull/shake gently). Once done, you will loose some balance and put pressure on the inner block that is now without support, but there is small undocumented cute detail: to maintain stability, the inside PVM rear inner block comes with mini legs :3

Messing around with the thing

Convergence

Tilt

Geometry

Geometry can be adjusted on the PCB marked as "D", it's the biggest one, on the right side of the inner block, if you look from the back. The following settings can be adjusted (probably more, but these are the most likely to be useful).

PVM D PCB.jpg

  • RV554 Horizontal Size
  • RV555 Horizontal Center
  • RV553 Pin Phase (aka skew)
  • RV552 Pin Amp (aka pincushion)
  • RV503 Vertical Size
  • RV509 Vertical Center

Caution: the post are mounted on the other side of the PCB, access to the rear of the pots is possible with see-through-holes. You'll need a tiny insulated screwdriver and be careful, does not look like these pots are super solid.

PVM test grid.jpg

To adjust geometry you need a test signal with some geometric patterns obviously:

  • Arcade PCB: usually they come with a service menu that has some patterns specifically for the board
  • Consoles: use the 240p Test Suite

Focus

Manual degauss