Telefunken TLD1501

[aviaras]

I have an older TV Telefunken 15 "TLD1501, it crashed. A green light changes to red light and nothing else happens. Is dead. The Screen has no lighting and no sound. Voltage is inside 12V and 5V DC. Regulators in 1501-50 and 1084-33PM. I took the connector with 6 pins and only 4 wires, with a 12v to the HV board in case of short circuit there, but nothing happened. TPA1517NE The IC output Audio has normal voltage the 7 pin (12v +). I have no remote control, but I believe it is also not necessary.
Any suggestions how to find the fault? Thanks in advance for your help