Απάντηση: Panasonic TH-42PX80E: Ξανατριπλάρει και ξανασκοράρει!!!
...ΣΕΛΙΔΕΣ 49, 50, 51 ...
D board SOS Detect
·Protection circuits are incorporated in the unit to prevent the failure of a single circuit or component from creating catastrophic damage.
·A shutdown condition occurs when there is an over voltage, a short or a drop in any of the voltage lines. Also the shutdown circuit is triggered when the fans are drawing more current than normal.
·Normally the CPU of the D board and the CPU of the A board detect when a shutdown condition has been triggered.
·When an abnormality has occurred, the unit protection circuit operates and the TV is reset to the stand-by mode. At this time, the defective block can be identified by the number of blinks of the POWER LED on the front of the unit.
·IC9003 of the D board detects conditions that make the power LED blinks 2, 3, 4, 5, 6, 7, 8, or 9 times.
·The following table identifies the areas where a problem is suspected according to the number of times that the POWER LED blinks.
2 Blinks SOS:Pin 62 of the CPU IC9003 monitors the 15V line. During normal operation pin 62 is kept high. If the 15V line is missing or shorted, a low is provided to pin 62. As a result, the unit shuts down and the power LED blinks 2 times.
3 Blinks SOS:IC9805 is a 3.3V regulator located on the D board. Its output is monitored by IC9003. If the 3.3V is not present at pin 61, the CPU (IC9003) shuts down the unit. The power LED blinks 3 times.
4 Blinks SOS:When an over voltage condition of the voltage lines from the power supply occurs, pin 18 of MC701 goes high. This high is provided to pin 67 of IC9003 of the D board triggering the “POWER SOS” circuit. When this happens, the TV shuts down and the power LED blinks 4 times. Primarily the P board causes 4 blinks, followed by the D board.
5 Blinks SOS:Pin 60 of the CPU IC9003 monitors the 5V line. During normal operation, pin 60 is kept high. If the 5V line is missing or shorted, a low is provided to pin 60. As a result, the unit shuts down and the power LED blinks 5 times.
6 Blinks SOS:Pin 65 of the CPU IC9003 monitors the status of the SC board. During normal operation, a low is applied to pin 65. If the SC board becomes defective, a high is provided to pin 65. As a result, the unit shuts down and the power LED blinks 6 times.
7 Blinks SOS:Pin 68 of the CPU IC9003 monitors the status of the SC, SU, SD board. During normal operation, a low is applied to pin 76. If the SC, SU, or SD board becomes defective, a high is provided to pin 68. As a result, the unit shuts down and the power LED blinks 7 times.
8 Blinks SOS:Pin 66 of the MPU IC9003 monitors the status of the SS board. During normal operation, pin 8 of connector SS33 outputs a low to pin 66. If the SS board becomes defective, a high is provided to pin 66. As a result, the unit shuts down and the power LED blinks 8 times.
A defective D board may also be responsible for the 2, 3, 4, 5, 6, 7, 8, or 9 blinks of the power LED. A defective component on the D board may supply the MPU (IC9003) an erroneous input that causes the unit to shut down, with the power LED blinking a number of times.