Most CRTs tend to display an image overscanned to ensure there is no border. This sometimes is set too high resulting in logos of a TV program or scores on a game being cut off. Newer TVs have a hidden service menu which can compensate this. On older CRT TVs the internal potentiometers are the only way to fix the overscan. As pointed out earlier there is a VERY HIGH VOLTAGE RISK.
However, if you keep clear of the Flyback Transfomer and the back of the tube and just adjust the pots with the right tools, it is safe. Note that the TV has to be on so you can see what the adjustments are doing.
CRTGAMER wrote:Be careful, VERY HIGH VOLTAGE around the back of the tube and the fat wire from the CRT to the Flyback Transformer.
The risk is small as long as you are very careful where you put your hands and screwdriver, ideally a "plastic" tuning screwdriver is the best way. A jewelers screwdriver will work, just be careful not to short out anything. The TV has to be on to see what is going on. Go in small increments when turning a pot, remember where you start from.
Usually there will be a bank of Potentiometers inside. These will have settings for tint, color, VHold and HHold as well as horizontal and vertical settings.
The Focus Pot is normally on the Flyback Transformer box like this. The fat wire cup goes to the CRT. KEEP CLEAR OF THE WIRES DUE TO HIGH VOLTAGE.
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homerging wrote:You may find this Japanese website about the MCZ3001D problem useful
http://www31.atwiki.jp/mcz3001d/
Thanks! One of the links there shows a schematic of the chip, how it communicates. The chips act as a safety switch, controlling power to the WEGA when voltage detection is off. Perhaps the chips are failing because of heat sensitivity throwing off detection of the correct voltage. This might explain why blowing a fan over the chips sometimes works.
- MCZ3001D Schematic.jpg (91.58 KiB) Viewed 6595 times
I received a Remote and Owners Manual from tvaddicted, a member at the AVS Forum. The remote is from a KV-HS32420 works beautiful as a spare for my KV-32HS500. This confirms the KVHS series all utilize the same basic PCB Board. Since my HDTV has no chips on the A Board, I suspect all of the KVHS TVs are similar with just the two chips on the D Board.
- Sony WEGA Remotes and Manuals.jpg (148.39 KiB) Viewed 6612 times
The Owners Manual offered some interesting information.
Differences between of the two HDTVs
KV-32HS500 .................. KV-32HS420
Remote has Joystick ........ Remote has Pad
DVI Input ......................... HDMI Input
No Zoom ......................... Zoom Capable
Memory Reader ............... No Memory Reader
Note the No Zoom feature and older DVI Input on my 4:3 KV-32HS500 CRT. When my HDTV was purchased, HD was in its infancy, so settings such as zoom, widescreen and full adjustments were not yet incorporated. Interesting that the KV-32HS420 which is also a 4:3 HD CRT has the additional screen control features. The video settings might be hidden in the Firmware Service menu on my TV, no way will I risk bricking though. I used my Cablebox and DVD player screen settings to get around this.
