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I can't adjust the red convergence vertically or horizontally.
Both the blue and green convergence are still fine.
Sometimes, after unplugging the TV for like a week or more, I will get the ability to adjust the red convergence. But, then, after a few hours of watching TV, the red convergence fails and I can no longer adjust it.
I have read other posts about replacing the two STKs.
However, I actually bought the service repair manual (a while back), and looking at the schematics, it seems like the horizontal and vertical red signal are always being processed separately. Seems odd that the ICs would fail just for a single color.
So I'm wondering if the problem lies elsewhere - bad capacitor - or deflector circuitry.
Slinteriors - unless the schematic is wrong, it seems to be quite clear.
STK#1 (IC8C01) controls horizontal for blue, green, and red.
STK#2 (IC8C02) controls vertical for blue, green, and red.
Each STK is NOT controlling both H + V of one color plus H or V of green.
Thus, if red convergence control is completely lost because of failed ICs, that means both ICs would have to be defective for red. If the failure of each channel in each IC is independent, then that gives me ~10% proability (1/3 * 1/3). Not negligible, but low enough to make me skeptical.
I'm just trying to avoid replacing something that might not actually be the problem. I'll probably still end up replacing the STKs, but I'm really not convinced that both of my ICs are bad.Slinteriors - unless the schematic is wrong, it seems to be quite clear.
STK#1 (IC8C01) controls horizontal for blue, green, and red.
STK#2 (IC8C02) controls vertical for blue, green, and red.
Each STK is NOT controlling both H + V of one color plus H or V of green.
Thus, if red convergence control is completely lost because of failed ICs, that means both ICs would have to be defective for red. If the failure of each channel in each IC is independent, then that gives me ~10% proability (1/3 * 1/3). Not negligible, but low enough to make me skeptical.
I'm just trying to avoid replacing something that might not actually be the problem. I'll probably still end up replacing the STKs, but I'm really not convinced that both of my ICs are bad.
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If the convergence works when TV is cold and fails as it warms up you may only have poor solder connections on the STK's, but given the age of the unit you should just go ahead a replace the $30.00 worth of IC's.
The STKs are three channel ICs they each control horizontal and vertical of one color the third channel controls part of green and the other half of green is controled by the other ICs third channel. Its customary for the Ics to fail and only have one channel bad in the IC. However its recomended to change both because of the bad Ic having green it can actually weaken the other IC and that one will fail shortly.
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Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.
Enter the menu on your TV. Use the remote control and bring up the menu.
Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
Press "Enter." A crosshair pattern will appear on your screen.
Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
I have given an general explanation on most projection TV ' s
Enter the menu on your TV. Use the remote control and bring up the menu.
Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
Press "Enter." A crosshair pattern will appear on your screen.
Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
To get the code to enter on your remote to engage multipoint convergence adjustments, you need to contact the rca customer care for that, you get them your model number and they will get your code for you.
To process and save the adjustment made, follow the steps below;
Look through your manual. Your manual will always give you the most
specific directions for your particular model. Look for an "adjusting
convergence" or "set manual convergence" section.
Enter the menu on your TV. Use the remote control and bring up the menu.
Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
Press "Enter." A crosshair pattern will appear on your screen.
Adjust vertically. If there is a horizontal red line visible, press the
up or down arrow keys (or channel up or down) to adjust the convergence
until the line is superimposed on the horizontal-center line of the
white crosshair.
Adjust horizontally. If there is a vertical red line visible, press
left or right (or volume up or down) to adjust horizontally. Do this
until the line is superimposed on the vertical line of the white
crosshair.
Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
You may be suggesting a convergence problem..when the blue and red boxes will not center. You have bad grounds on the convergence ICs. Resolder or replace theses ICs. Or you may be asking about a problem in the vertical section. Vertical problems will appear as horizontal lines on the TV. In this case you have bad capacitors near ithe vertical IC and must also resolder or replace the vertical IC.
There are 2 Convergence Chips: 1 for Horizontal (it includes Red, Green and Blue Convergence channels) and 1 for Vertical (it includes Red, Green and Blue Convergence channels). Horizontal Convergence Chip is 7044 and Vertical convergence Chip is 7045 (both STK392-120). They are fixed in same "big" Heat Sink, with a 2 metal black clips, from Video Inputs board side.
probably having a convergence fail. if you are able check the solder connections on the convergence ICs on the large heatsink located on the middle PCB of the chassis. as long as the fail hasn't gone its coarse you may be able to correct the problem by a simple re-soldering of cracked(bad connection) pins.
One of your convergence IC's has either cracked loose or burned out. The IC will have to be resoldered or replaced and then the convergence circuits realigned. If you do not have experience in repairing convergence circuits then have a qualified tech handle it for you. This is by far the most common failure in the projection sets and a good tech can have it fixed in about an hour and a half. I charge $150 for that but shops in your area will vary, so call around.
Slinteriors - unless the schematic is wrong, it seems to be quite clear.
STK#1 (IC8C01) controls horizontal for blue, green, and red.
STK#2 (IC8C02) controls vertical for blue, green, and red.
Each STK is NOT controlling both H + V of one color plus H or V of green.
Thus, if red convergence control is completely lost because of failed ICs, that means both ICs would have to be defective for red. If the failure of each channel in each IC is independent, then that gives me ~10% proability (1/3 * 1/3). Not negligible, but low enough to make me skeptical.
I'm just trying to avoid replacing something that might not actually be the problem. I'll probably still end up replacing the STKs, but I'm really not convinced that both of my ICs are bad.
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