The unit goes shut down, and the standby LED blinks 10 times
When the power LED blinks 10 times right after the TV has been plugged-in
into the AC line and the Power is OFF, the P, the PA, the DG, the H, or the DT may be defective.
The DT, DG, and H board are part of
the assembly. For troubleshooting, the DT board must be removed.
To rule out the H board:
Disconnect connector H40 and plug the TV into the AC line
Note: If the Power LED stops blinking, the H board may be defective. If the power LED still blinks, See the next.
Keep in mind, every time the H board is suspected to be defective, change both the PA and the H board at the same time before applying power to the unit.
To rule out the DT board (Digital Tuner)
1. Remove the screws securing the DT board. Plug the TV into the AC line.
2. Note: If the Power LED stops blinking, the DT board may be defective.
3. Note: When the DT board is removed, the unit will power up with all functions disabled due to lack of data communication.
4. If the Power LED still blinks, it is possible that the problem is the PA or the DG board.
Shutdown Detect Circuits
What will normally cause the TV to
shut down?
A short circuit on any of the voltage lines
An over-voltage condition
Abnormality in the Control Drive Pulse circuit (SC, SU, SD, and SS boards)
An over-voltage condition
Abnormality in the Control Drive Pulse circuit (SC, SU, SD, and SS boards)
Cases When Missing Voltages Can Cause the TV to Shut Down
Missing the source voltage to the PA board (STB14V) from the P board
Missing output voltage from the PA board to the DG board.
Missing 15V or VSUS on either the SS or SC boards while the control drive pulses from the D board are being provided.
If the SUB 5V, SUB 9V or MAIN 3.3V is missing on the DG Board, the unit goes into shutdown.
The power LED blinks ten times.
The voltages are monitored on the DG board by the MPU, IC1103.
Shutdown due to Over-voltage or Short Circuit
This could happen if there’s a short circuit in one of the B+ lines from
the PA board, an over-voltage condition, or missing STB 14V from the P board.
If any of the SUB or MAIN voltages that are highlighted on the DG Board is missing, the unit goes into shutdown.
The power LED blinks ten times.
If any of the voltages created on the PA Board is excessive or shorted, the unit goes into shutdown.
The power LED blinks ten times.
The base of Q5642 being low indicates a short circuit in the Main 1.8V, Main 9V, or Main 5V output of the PA board.
The base of Q5641 being low indicates a short circuit or an over-voltage condition in the NR14V, Main 1.8V, Main 3.3V, SUB
9V, SUB 3.3V or SUB 5V output of the PA board.
