All red picture now.

To achieve true life like colors, the primary colors need to be balanced to produce a perfect black and white picture. Turn the color level on the tv to 0 and tint to middle then look at the picture - does it have a reddish or other "coloration" to it? Then set the individual color levels (if your TV has these settings) of red, blue and green to balance out and get a true black and white picture. After that, bring the color level up slowly until the facial levels are natural - not over driven as seen in most store displays. You may need to use tint control slightly.....
One other way - There is a dvd from Disney called "Wow" that aids in getting your set to optimum display.

I would open it first and look, a lot of those had both the screen and drive controls on the PCB at the end of the picture tube, at least look there first.

You are dead on in looking for the screen controls, if you find one it should only be a tiny adjustment due to age and the Crt changing a bit.

Examine the screen with set on and color set to zero--stand back and look= is screen pink to red color?

If so it may be a common issue on this Hitachi.

Usually it is an adjustment inside the set of the red screen control needing to be turned just slightly down---these are known for the red control "drifting" just slightly from time to time--answer is based on model number indicated here.

Your TV has whats called a convergence problem. You can get parts, instructions, and installation support from sites such as www.TvRepairKits.com

These procedures are from the owners manual, go into menu and then picture quality and then: Convergence The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’ images are precisely aligned, they create the color images you see on the screen. Over time, the picture can drift out of alignment (this is normal). If your picture seems fuzzy or has a yellow tint, using Convergence could correct this misalignment. Only one convergence is needed for all inputs, regardless of the signal format. Note: Make sure the TV has been on for at least 30 minutes (TV needs to warm up for best results) before starting Auto Converge or Red/Blue Centering. When you select the Convergence feature, a submenu appears with three options: Auto Converge Automatically aligns the projection lenses to self-correct color images. You’ll see flashing squares of color dance across the screen (this is normal). Note: After performing auto convergence, use the Blue Centering and Red Centering menus to fine tune convergence in the center of the screen, if necessary. Blue Centering Aligns the blue and green images to fine-tune the picture. Red Centering Aligns the red and green images to fine-tune the picture. Note: The ability to change channels is disabled when adjusting the convergence options. The TV must be tuned to a usable signal to converge the picture.

yes! those are the screen and focus adjustments. 3 for screen, 3 for focus. try this. go in menu....turn down color, brightness, contrast all they way down. you should then have no picture, but in your case a little red. then go to back of tv and turn those 3 screen adjustments all the way down. slowly turn the screens back up until you get barely a picture. because remember, your brightness and contrast is all the way down. the picture should be dim but seeable and with red, green, blue adjustments, make it a black and white picture. when balanced..... turn up color , brightness, contrast in menu. enjoy!

Sounds like your convergence IC chips have failed. You can buy the parts from various suppliers or you can just get a complete repair kit from www.TvRepairKits.com

Your alignment is off. Go to the set up menu then convergence. hit right and you will be in the convergence menu. select the color that is not in alignment. The green line does not move. if blue and green are lined up the line will be cyan. if red and green are lined up the line will be yellow. when all three are lined up the color will be light. Best of luck!

Chances are, if it's an older set, componants have changed value through use over time, which also includes the picture tubes and associated driver circuits. The way to compensate for this color drift is through adjustments. Either turn the red down a little, or turn the blue and/or green UP. Be carefull though as there are potentially dangerous voltages in and around the circuit boards and picture tubes.

I would suspect you have several capacitors drifting out of tolerance as they warm up. When checking for these, also make sure to change The value Of C813 (33uf 16v) To (10uf 50v) if it hasn't been done already. You'll need a technican with a capacitor meter and ESR tester to find the marginal capacitors. I doubt that any of your STK packs (IC's) on your convergence module are defective. I'm also assuming that the tapping with the wooden stick didn't change anything, otherwise a bad solder connection could be the culprit.