This repair instruction (hereinafter referred to as the "instruction") is intended for specialists of repair enterprises that carry out maintenance and repair of color TVs "Photon 51TTs-408D" (4USCT-3-51-21), "Photon 51TTs-409D" (4USTsT-3-51-22), "Photon 51TTs-417D" (4USCT-3-51-25), "Photon 51TTs-418D" (4USCT CT-3-51-26), "Photon 51TTs-408DI" (4USCT-3-51-31), "Photon 51TTs-419DI" (4USCT-3-51-32), "Photon 51TTs-417DI" (4USTsT-3-51 -33), "Photon 51TTs-418DI" (4USTsT-3- 51-34) (hereinafter referred to as "TVs"). Photon 51TTs-408D TV (4USTsT-3-51-21) is the base model for 4USTsT-3 TVs. Before starting to repair the TV, a specialist of the repair company (hereinafter - "specialist") must carefully study this instruction. The instructions include: a description of the design, principle of operation and a description of the electrical circuit diagram of TVs, units, modules and individual cascades, recommendations for organizing a workplace, for troubleshooting, and the necessary reference materials.