@ahyong intermittent failures are the hardest to diagnose. Here is the way your TV is supposed to work (Turn ON)
IC8000 on the A board outputs the “TV_SUB_ON” command. The “TV_SUB_ON” command is provided to pin 5 of connector P6 of the power supply to develop the F15V. At this time, the relays on the power supply are triggered and a click” sound can be heard.[br]
The F15V from the P board is applied to the Voltage regulators on the A board.[br]
IC5000 outputs the "DCDCEN(ENABLE)" command to the voltage regulators to output several voltages respectively. [br]
I know it's a lot of "blah blah blah" but that is the clicking you here. It sounds like it may be a component on the A-board which is failing (overheating). That would also explain why it works again after 5 minutes.
@ahyong intermittent failures are the hardest to diagnose. Here is the way your TV is supposed to work (Turn ON)
-
IC8000 on the A board outputs the “TV_SUB_ON” command. The “TV_SUB_ON” command is provided to[br]
-
pin 5 of connector P6 of the power supply to develop the F15V. At this time, the relays on the power supply[br]
-
are triggered and a click” sound can be heard.[br]
-
The F15V from the P board is applied to IC5000, IC5900, and IC8701 (Voltage regulators) on the A board.[br]
-
IC5000 outputs the "DCDCEN(ENABLE)" command to the voltage regulators to output several voltages[br]
-
respectively. [br]
+
IC8000 on the A board outputs the “TV_SUB_ON” command. The “TV_SUB_ON” command is provided to pin 5 of connector P6 of the power supply to develop the F15V. At this time, the relays on the power supply are triggered and a click” sound can be heard.[br]
+
The F15V from the P board is applied to the Voltage regulators on the A board.[br]
+
IC5000 outputs the "DCDCEN(ENABLE)" command to the voltage regulators to output several voltages respectively. [br]
I know it's a lot of "blah blah blah" but that is the clicking you here. It sounds like it may be a component on the A-board which is failing (overheating). That would also explain why it works again after 5 minutes.
@ahyong intermittent failures are the hardest to diagnose. Here is the way your TV is supposed to work (Turn ON)
IC8000 on the A board outputs the “TV_SUB_ON” command. The “TV_SUB_ON” command is provided to[br]
pin 5 of connector P6 of the power supply to develop the F15V. At this time, the relays on the power supply[br]
are triggered and a click” sound can be heard.[br]
The F15V from the P board is applied to IC5000, IC5900, and IC8701 (Voltage regulators) on the A board.[br]
IC5000 outputs the "DCDCEN(ENABLE)" command to the voltage regulators to output several voltages[br]
respectively. [br]
I know it's a lot of "blah blah blah" but that is the clicking you here. It sounds like it may be a component on the A-board which is failing (overheating). That would also explain why it works again after 5 minutes.
A-board is the bottom board in your last picture.