First, each module functions on the screen:

PDP screen is divided into the power Board, x driver Board, y drive BUFFER Board, logic board, logic board (e, f, g), y-BUFFER Board (upper and lower), COF and other parts:

Power Board: other modules on the screen, screen and machine manufacturers make motherboards, video processing Board provides power.
X driver Board: follow the timing signals that were sent on the logic board, and x electrode to provide drive signals.
Y drive Board: follow the timing signals that were sent on the logic board, and y electrodes provide drive signals.
Logic board: processing image signal from the motherboard to send, addressing driving signals, and for x and y drive boards provide drive signals.
BUFFER logic boards (e, f): return on the logic board of the data signals and control signals to the COF needs signal.
Y-BUFFER Board (upper and lower): y drive Board scan the signals to the screen is divided into two parts.
COF: logical BUFFER Board sent signals, to address to use for screen signal.

Second, troubleshooting:

1. Screen does not light:
A, by the power supply filter Board power supply Board power supply plug if there plugged. No, plugged in the socket.
B ... check the fuse on the power supply Board is open, is a good fuse replacement.
C. POWER_ON/OFF grounding socket on the power supply Board CN802 4th foot:
Then the logic board on the toggle switch SW2001 from the external mode (1, 2, 4, 3) into internal modes (1, 3, 2, 4);
Power on, screen is lit. If a normal screen output in full white signal, motherboards or video processing Board for our problems, be dealt with separately.
D. If the screen is still not lit, replace the power supply Board first, see whether the problem is resolved.
E. If replacing the power supply Board still does not solve the problem, the screen problem, replace the entire screen.

2. Appeared on the screen one or several horizontal is off line:
Check y drive Board with y BUFFER between the outlet of the plug, if not plugged in, plugged in the socket again, if it is already plugged in, according to the upper and lower lines appear on the screen, replace the y BUFFER (upper and lower).

3. Appear on the screen one or several lighter than the rest of the horizontal lines on the edge of the horizontal bright-line:
Check y drive Board with y BUFFER between the outlet of the plug, if not plugged in, plugged in the socket again, if it is already plugged in, according to the upper and lower lines appear on the screen, replace the y BUFFER (upper and lower).

4. Appears on the screen does not light perpendicular to the line, or perpendicular to the block does not light
A ... If there is not one bright vertical line, is the COF has a problem.
B. If appears perpendicular to the block does not light, check whether is a logical connection between the BUFFER COF and Sockets have a problem, if there is no problem, examine a logical BUFFER between the logic board and the connection socket is functioning properly. If it is normal, replace the logic BUFFER. Finally, the change, if it does not resolve the problem, replace the logic board.

5. when a monochrome signal is displayed on the screen, vertical one or several of the other colors appear bright lines:
A ... If it is a different color bright vertical line appears, you have a COF or screen problem.
B ... If the block occurs perpendicular to the other color is bright, first check if the COF and the logical connection between the BUFFER socket problem, if there is no problem, examine a logical BUFFER between the logic board and the connection socket is functioning properly. If it is normal, replace the logic BUFFER. Change, if this does not resolve the problem, replace the logic board, and finally, the logic board problem is if he is still there, is the COF has a problem.

6. Appears on the screen with different exceptions to the foregoing highlights, bright blocks such as:
A.-checking logic BUFFER and COF plates between the logic board and logical BUFFER between socket is connected properly.
B ... replace the logic BUFFER boards, if unresolved, replace the logic board. If the problem is still there, is the COF has a problem.