Check if the Operating LED on the Logic Main blinks at a
half second interval. If the frequency
of the blinking is too fast or slow, it means that the MICOM has failed to
process the data properly. Therefore, you have to reload the data onto the
MICOM. Load the data using GA-WRITER when the power is connected to the module.
- If no problem is found during the Visual Inspection, check if the drive waveform and the address data outputs are normal using an oscilloscope. (Checkpoint: The DAMPING R-NET part output of each data output terminal.)
- If no drive waveform or address output is measured, this means that there is a drive problem due to MICOM data corruption, which was the reason in the Visual Inspection. Therefore, in this case, reload the data as you did in the Visual Inspection.
- When data output is measured but it is abnormal, and the drive waveform is abnormal, it is probably due to a short-circuit of the hardware. If the address data is abnormal, the screen may be abnormal due to abnormal data output by an abnormal operation of the DDR memory due to an abnormal Vref voltage, or the screen may be abnormal due to a short-circuit in the ass'y inside the board. You have to conduct a short-circuit test for each case.
- If the Vref voltage (the voltage of the Voltage Divider) is lower than 1.25V, check the resistance of the resistance output part and check if the circuit is normal. If the Vref voltage is normal, the screen operates normally.
- If the screen is abnormal, even though the Vref voltage is normal, check if there is a short circuit by conducting a short-circuit test. If a short-circuit is found, repair it. If the short-circuit is an internal one, replace the board.
NO DISPLAY
{CLICK ON PICTURES TO ZOOM. Click on ß at the top left of
the browser window, to come back}
ABNORMAL DISPLAY
FAULTY SCREEN DISPLAY & POSSIBLE REASONS
A blank vertical cell (block) appears on the screen.
- Address buffer defect: Replace the corresponding upper/lower buffers (E, F).
- COF defect (burnt): Replace the module.
- The Scale is not resetting. Replace the Main board.
The OSD box appears but there is no text.
- Incorrect program version: Check the version of each program. Replace the Main board.
A blank upper (or lower) block appears on the screen.
Upper/Lower Y Buffer defect. Replace the corresponding upper/lower buffers (E, F).
Either the main or sub picture does not appear.
Replace the Main board.
A vertical green line appears on the screen.
The SMPS voltage is incorrect. Adjust the SMPS voltage according to the voltage printed on the
module label.
Dim screen (blurred in red).
X-Main board defect:
Replace the X-Main board.
A blank screen appears.
Replace the Y-Main
board.
TROUBLESHOOTING PROCEDURES BY ASSEMBLY
- SMPS-PDP TV à No power, Blank screen, the Relay repeats On and Off.
- ASSY PDP MODULE P-X-MAIN à Blank screen.
- ASSY PDP MODULE P-Y-MAIN à Blank screen.
- ASSY PDP MODULE P-LOGIC MAIN à Blank screen, Screen noise.
- ASSY PDP MODULE P-X-MAIN BUFFER à Row Bar screen is blank.
- ASSY PDP MODULE P-ADDRESS E BUFFER à Corresponding Buffer Board block screen is blank.
- ASSY PDP MODULE P-ADDRESS F BUFFER à Corresponding Buffer Board block screen is blank.
- ASSY PCB MISC-MAIN à No Power, Abnormal screen for each input source, PIP screen trouble, Sound trouble.
- ASSY BOARD P-FUNCTION à The side function key does not work properly.
- ASSY BLUE P à The side function key does not work properly. The remote control does not work properly, the LED does not work properly.
42"
50"
