The Making of your Monitor

STAGE II

After PBA assembly, stage two is complete. Last month we saw the assembling of a monitor till here

STAGE III

The picture tubes are imported into the country for integration with the rest of the circuitry at the plant. This picture shows stacks of picture tubes moving in for assembly

The next stage is putting the degaussing coil around the picture tube. As the name suggests, this coil is used to degauss the picture tube

Now the pre-assembled printed board assembly is fitted to the front bezel, and the connectors from the board are connected to the appropriate points on the CRT. The physical assembly of the monitor is more or less complete now. 



The first adjustment is the tilt adjustment for the CRT. A total of four screws are used to connect the CRT to the front bezel. These screws are adjusted to adjust the tilt of the CRT

STAGE IV

Now come the voltage adjustment and the white balance adjustment (adjusting the ratio of R,G and B to get pure white)

Next, comes the function check stage. Here the monitor is checked to see if all the functions are working properly, and if there are any physical defects

At this stage, the monitor is sent for ageing. Ageing is like burn-in, where the monitor is left on for 30 min, passing it through overhead racks

After ageing come final white balance adjustment and focus adjustment. This focus adjustment is one of the most critical steps in the assembly of a monitor. After focus adjustment comes auto image adjustment. Here the height and width of the image is adjusted for four different modes that the monitor will operate in. Once that is done, the white balance is adjusted again, in what is called the final-final white balance adjustment stage. Auto image adjustment is now done for four more modes

Now comes another critical stage in the adjustments–the convergence adjustment. After this, the convergence and focus are checked using a powerful camera. After this comes the DPMS or digital power meter check. Here the power consumed by the monitor in sleep mode is checked to ensure that it conforms to specs. Once the monitor passes this test, the back cover is fitted on.



Testing is not over yet. The monitor now goes in for the high voltage test. 2.4 KV DC is fed to the monitor, and it is checked for leakages, continuity, etc 

Next comes the shock test. The monitor is physically beaten from both sides using the gloved device shown in the picture, and the final inspection is done. Once the monitor passes the final inspection, it goes in for DDC (Display Data Channel) write. The basic information about the monitor is written into ROM. The written data is read back for accuracy in the next stage called DDC read

Once the monitor successfully completes DDC read, it is ready for packing. Before packing, the cable, the manuals, driver floppy, warranty card, etc, are manually inserted into the package. The packed monitor is stacked and moved to the godown for onward shipping to sales points