🗊Презентация Understanding how System Shut Down operates

A short circuit on the voltage lines. Over-voltage condition. Abnormality in the Control Drive Pulse circuit i.e. SC, SS, SU or SD boards. Missing source voltage to the PA board (STB14V) from P board. Missing output voltage from the PA board to the DG board. Missing 15V or Vsus on either SS or SC board while the control drive pulses from the D board are being provided.

How to Rule out the P Board Use a Peak Hold Meter for voltage reading NOTE: Follow this procedure when the click sound of the relay can be heard after the unit is plugged in. If the relay does not click, check the STB 5V from the P board. If the STB 5V is missing, the P board may be defective. (If STB 5V is OK, the DG board may be defective. Disconnect Connector P10 on the P board. (Make sure that the TV is unplugged) Because you only have 2 – 3 seconds to measure the STB14V, place your meter’s probe at pin 1 of connector 10 of the P board before plugging the TV in to the AC line. Plug the TV in to the AC line while still holding the probe at Pin 1. Check to see if the 14V comes up. If it does not come up the P board is defective. If it does, (since it may take some involvement to determine which of the PA or DG board is defective) it is OK to order both the PA and DG board together.

To rule out H Board Disconnect connector H40 then plug Plasma TV to AC line. If the power LED stops blinking, the H board may be defective, otherwise another board is causing the problem. NOTE: It is recommended that the PA board be replaced at the same time if the H board is suspected to be defective and will be replaced.

To rule out the DT (Digital Tuner) Board Remove the DT board and then plug the Plasma TV into an AC source. Note: When the DT board is removed, the unit will still power up but all functions are disabled due to the lack of data communication If the power LED stops blinking the DT may be defective otherwise, another board is causing the problem. Other possible causes of blinking are the PA or DG board.