The System Board has the last output terminal, DNIe (SPD41),
which shows the internal Test pattern.
The Power Board supplies power to the Deflection/Ayatem
Board.
The System Board receives all signal inputs, the
signal-processed signal is sent to CRT Ass'y.
The Deflection Board controls deflection and focus.
- Enter Service Mode. (In SET STANDBY status, if you press "Info", "Menu", "Mute" and " Power" in sequence on the remote control, the screen is turned on and the Service Mode screen appears.)
- Check if the System Board is out of order. Press OPTION =>TEST PATTERN => Right direction key: The COLOR BAR, BLACK pattern and WHITE pattern are displayed on the screen. If the pattern is not displayed or is displayed abnormally, the DNIe IC (SPD41) or the System Board is out of order.
- Check if the Power Board, which supplies power to the System Board and the Deflection Board, is out of order. If you cannot turn the screen on by pressing the POWER ON/OFF button or the screen repeatedly turns on and off when pressing the POWER ON/Off button, check if the Power Board is out of order.
- Check if the Deflection Board is out of order. When the screen is not properly displayed and the left or right side of the picture is shrunk, or the top or bottom of the screen is expanded or shrunk, check if the Deflection Board is out of order.
FLOWCHART
TROUBLESHOOTING BY CHECKSUM
Diagnosis of trouble by the checksum is neither reliable nor
convenient. You can only use the checksum
of the current direct-view TV to determine whether the software is corrupted or
not. The Checksum value is determined
according to the version of the software loaded on the set. Therefore, you can determine whether the
software has been properly downloaded, if you know the correct checksum for
that version of the software.
You can check the checksum according in the following order.
- Factory Mode => Checksum => Right Button => Calculate Checksum => Output Checksum (e.g. 0xab2b)
T_COREOAKR1_1010 : checksum = 0xab2b
T_COREOAKR1_1014 : checksum = 0x4faa
NO SIGNAL
THERE IS NO RF SIGNAL
NO VIDEO SIGNAL
NO DTV SIGNAL
NO SOUND
NO RASTER
CLICK ON CHARTS TO MAGNIFY
