A Hisense 39 inch model: LCD39V77PK glowing with blue led directly after connecting to power source (no standby red led) and no sound or picture appears with no response to buttons or remote control!!
i checked the power board voltage all of them were Ok. also i checked the control board voltage all of them exist but the flash IC voltage was 4.3 v not 3.3 v so i replaced the voltage regulator with same # and the voltage back to 3.3 v but same issue.i reflashed the flash IC with same model software but same issue.
i checked power signal (5 v) from control board to power board it is always on directly after attaching tv cable to power source.
i disassembled the Flash IC, HDMI IC and sound IC and check all smd capacitors for any short then connected tv same 5 v always on
i disassembled all connected cables from power board to control board and only connected 5 V Standby voltage to control board and i found that the power signal continue to be on!!!
Any suggestion for the problem and how to fix it please
i checked the power board voltage all of them were Ok. also i checked the control board voltage all of them exist but the flash IC voltage was 4.3 v not 3.3 v so i replaced the voltage regulator with same # and the voltage back to 3.3 v but same issue.i reflashed the flash IC with same model software but same issue.
i checked power signal (5 v) from control board to power board it is always on directly after attaching tv cable to power source.
i disassembled the Flash IC, HDMI IC and sound IC and check all smd capacitors for any short then connected tv same 5 v always on
i disassembled all connected cables from power board to control board and only connected 5 V Standby voltage to control board and i found that the power signal continue to be on!!!
Any suggestion for the problem and how to fix it please
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