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There is a lot of debate about why circuit boards are green but the reason is because its the color of the insulating varnish that is used to to protect the board from short circuiting and the copper from corroding. It is also an indicator that your circuit board is made out of glass-epoxy whose natural color is green.
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
No, it is not the brake lamp switch. If the brake lamp switch was not working, the high mount (3rd) brake lamp would also not function. Chevrolet trucks are notorious for bad tail lamp circuit boards.
Disconnect the electrical connector from the circuit boards. Check for power at the circuit board connector (with the brake pedal depressed) on each side. The brake/turn lamp circuit for the left side is the YELLOW wire. The brake/turn lamp circuit for the right side is the GREEN wire. If there is power at the connector, check the GROUND (BLACK wires) to make sure they are getting a good ground. If the power and ground circuits are OK at the connector, replace the circuit boards.
NOTE: DORMAN makes a kit that includes circuit boards for both sides it is DORMAN Part Number 70001
If there is no power on the YELLOW and GREEN wires at the circuit board connectors, the most likely cause would be a defective turn signal switch.
your color wheel/ color main bored has gone bad (red flashing indictating one of 3 things depending on flashing. no power to main board. or to much power/bad board on one of the color boards) or you just need to replace the bulb in it. i doubt its a bulb issue bc you do see a greenness to it at first. but *** will auto shut down till the board is fixed. sorry for the bad news but this is your solution. . if you can tell me what model the tv is i cna find out exactly what it is and how many flashes.
manual convergence should fix the problem if it does not the set most likely either has a bulb burnt out or a bulbs power / focus needs to be adjusted by taking off the panel and finding a 6 screw control panel
should look like that 3 screws in a row on top of another three screws each of thees control the power and focus of each color this is a somewhat delicate process and is a huge pain on larger tvs that you cannot completely see the picture or color while you are directly under in front of it so I had my gf come in the room and sit across to let me know which color was doing what if you dont have someone you will need to check after each adjustment
now the diagnostic as i said each screw controls a colors power and focus the focus is used if you see an outline of a color around pictures if everyone looks like a dead jedi with a blue aura around them the blue focus needs to be adjusted and so on for each color if you skies or blue screens seem feint your blue power probably needs to be turned up and so on for each color
if through the course of this you can see the bulbs and notice one is out your probably looking at dealing with the color issue until the time you can purchase a new tv as the cost of the bulb and the technician needed to install it as they are wired to a circuit board and requires technical knowledge and tools