Summary

32" silver curved consumer TV from JVC with component from 2001. This year marked when the D-Series and other chassis experienced cost cutting. They were still quite good, nevertheless.

Manuals

• User Manual
• Service Manual
• Official Webpage

Mods & Repair Guides

• Turning Off Red Push on 2001 JVC D-Series AV-XXDX02

Notes

The 2001 D-Series and other component sets by JVC models featured a new chassis with a Toshiba jungle chip. The chassis also has some cost cutting with less capacitors in the power supply, resulting in increased raster bloom and geometrical warping. Oh goody. But the chassis does have the upside of using a 3-line comb filter for composite video, which is an improvement over the previous chassis's 2-line comb filter.

This specific model features two s-video inputs, which is handy.

The tube in this model varies, but the one featured in this article uses a lovely Panasonic CPT. (The "M" beside the serial number stands for Matsushita, aka Panasonic.)

This set has red push, significantly more saturation compared to the previous D-Series chassis. Red's are blown out, purples are pinkish, and yellows have an orange tinge to them. Thankfully, there is a way to dial it back almost completely with a few tweaks in the service menu. Be aware that settings for red push are saved separately for different inputs and picture modes. To disable for all combinations, see full instructions under Mods & Repair Guides.

Composite 240p Performance, Disabling Vertical Edge Enhancement

by Eli Krause

I. For composite decoding this set uses a Toshiba TC90A53N, a 3-line digital comb filter. One beneficial feature of this comb filter is its "1-line color dot interference reducer circuit". Depending on the console/revision, dot artifacting ranges from slight to moderate, and blending effects may be broken. Using an external notch filter to decode composite instead^[1] (such as is available in a RetroTink scaler) and sending that to the component input would blend all dithering patterns and remove nearly all dot artifacts.

II. Just as velocity scan modulation is intended to increase contrast at horizontal edges, vertical edge enhancement artifically boosts contrast at vertical edge transitions for composite and RF sources. To reduce this to its minimum, the high signal sent to pin 17 of the comb filter must be brought low which can be achieved by removing the resistor leading to that pin. On the AV-20D202 and AV-27D302 it is R239 on the bottom of the main board. On the AV-32D502 it is R247.