ONN XQ-2623 SERVICE MODE

[EARLYBIRD]

Hi.We have a ONN XQ-2623 (ASDA special) which has had a faulty power supply (bulging caps).The fault has corrupted the eeprom.Does anyone know how to access service mode. The main AV panel number is B.TR904C. The fault is cured by reducing the contrast in the customer menu but would like to reset the eeprom settings.Hope someone can help.