AUDIO OUTPUT ERROR [7X]; {7 Blinks of Standby/Power LED prior to shut-down]
This error is relatively straight forward. The error occurs when one of the audio outputs is shorted, or if a DC voltage level is present. In either case the problem exist on the audio board [K-board].
Remove the K-Board to verify that the K-Board is causing the TV to shut down. If K-Board is defective, the TV will turn ON with video, and will have no audio. If the TV still shut down [7X], then the problem with the 'DE' microprocessor, and consequently, the ASU/DSU assembly must be replaced.
[8X]; There will be no such error code occur this TV.
PANEL ERROR [9X]. (9 blinks of standby/power LED prior to shut-down)
This error is somewhat deceiving because of the name 'panel error'. An actual defect LCD display will not cause this error or any other error for that matter. The likely reason for the name Panel Error is that a defective C-board, which is the LCD display driver can cause [9X] error. The S1 Board and S2 Board can also cause a 9X error.
The fundamental defect that causes this error is a loss of I2C communications, or inter-IC Acknowledgment between the C-Board, or S2 Board and the 'DE' microprocessor. One or more of these three boards have failure to communicate the DE microprocessor. Therefore, the first step in solving the problem is to check for loose or damaged connections between all three boards and the ASU-Board or the DSU-Board. Secure and/or repair connections where needed.
If all the inter-board connections are OK, the the next step is to determine which board has failure and is not communicating over the I2C bus. Just begin substituting known good boards to locate the faulty board. To be more effective and efficient, first confirm that each board is receiving the proper supply voltages. This will quickly eliminate or detect a power supply failure, in which case, need to go to power supply and troubleshoot a power supply problem.
Check CN2502 pins7 and 11 on both the S-1 Board and the S-2 Board for the presence of 5V.
Check CN6900/ pins 4 through 6 on the C-Board for the presence of 6.5V.
Once again, if the voltages are missing the defect exists on the Power Supply.
If the Power Supplies are present at all the boards the troubleshooting process comes down to a process of elimination by substituting known good boards.
Substitute boards in the following sequence for the most efficient and cost effective results:
- S1-Board.
- S2-board.
- Optical Block {includes C-Board}
- ASU/DSU Assembly.
