Model: KP-53XBR300, KP-53HS10 KP-61HS10, KP-61XBR300 Subject: AKB Error When First Turned ON Date: August 1, 2001 Symptom: (2311) When the unit is first turned on from cold start the LED flashes
5 times at first power- ON, and no picture is received. If turned OFF and then ON again picture is present. Unit will play the rest of the day without any problem. Solution: If the customer should complain of the symptom above please perform the following circuit changes to the BD Board. Note 1: Some BD boards had countermeasures applied at the factory. These boards do not need to be reworked in the field. See illustrations 1 through 3 for identifying the boards that have had countermeasures applied at the factory.
Illustration 1 Carefully peel up the coper tape on the side edge of the board. Illustration 2 Lift up the shield from the board, using the long copper tape as a hinge. Illustration 3 Factory-reworked boards have a 10K chip resistor mounted near R1924; no further rework is necessary. TV Products Service Bulletin No. 484R2 Note 2: The specific procedure depends on whether or not the original service bulletin had been performed previously. =B7 If R1709 and R1713 are both mounted on the board and are 470 ohms, the original bulletin was not performed previously. =B7 If only R1713 is mounted and is 100 ohms, and R1709 is not mounted, the original bulletin was performed previously. =B7 New BD boards received from WRPC-AS must also be checked to see if the original bulletin was performed previously. Procedure for BD boards that have not had the original bulletin performed.
1- Change R1709 and R1713 from 470 ohm to 1K ohm.
2- Remove Q1701.
3- Add a 10K resistor to the A-side of the BD board near C1741 as shown in the illustration.
4- Check the solder joints of all pins on IC1718 and touch up if necessary. REF FORMER NEW DESCRIPTION PART NUMBER DESCRIPTION PART NUMBER R1709 R1713 RESISTOR, 470 OHM (CHIP)
1-216-041-00 RESISTOR,
1K OHM (CHIP)
1-216-049-11 Q1701 TRANSISTOR, DTC144EKA
1-801-806-11 REMOVE -
- - - RESISTOR,
10K, 1/4 W
1-247-855-11 Procedure for BD boards that have had the original bulletin performed.
1- Install a 1K ohm resistor to mounting position R1709.
2- Change R1713 from 100 ohm to 1 K ohm.
3- Add a 10K resistor to the A-side of the BD board near C1741 as shown in the illustration.
4- Check the solder joints of all pins on IC1718 and touch up if necessary. REF FORMER NEW DESCRIPTION PART NUMBER DESCRIPTION PART NUMBER R1709 NOT MOUNTED - RESISTOR,
1K OHM (CHIP)
1-216-049-11 R1713 RESISTOR, 100 OHM (CHIP)
1-216-025-00 RESISTOR,
1K OHM (CHIP)
1-216-049-11 Q1701 TRANSISTOR, DTC144EKA
1-801-806-11 REMOVE -
- - - RESISTOR,
10K, 1/4 W
1-247-855-11 TV Products Service Bulletin No. 484R2 . R1709 R1713 Q1701 IC1718 Add 10 K resistor, part number 1-247-855-11. C1741