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SUBJECT: Q551 Horizontal output transistor.
PANASONIC BACKGROUND: Possible failure of Q551 on 28" Euro 4 Models
CHASSIS Euro-4 REMEDY: Change transistor type and resistor value, in the following
configurations only, using this kit.
Models
NOTE: When replacing Q551 apply Heat Sink Compound between
TX21MD4 TX25MD4 TX25XD4/A TX25LD4DP Q551 and heat sink.
TXW28R4 TXW28R4DP TXW28R4L
A: Model TX21MD4 TX25MD4 TX25XD4/A TX25LD4DP
TX28MD4 TX28MD4L TX28LD4DP Replace Q551 Part No BU2508AXLB with BU2508AXLB
TX28LD4DPL TX28XD4/A TX28XD4L/A (No Change)
B: Model TXW28R4 TXW28R4DP TXW28R4L
Replace Q551 Part No BU2508AXLB with 2SD1577LB
C: Model TX28MD4 TX28MD4L TX28LD4DP TX28LD4DPL
TX28XD4/A TX28XD4L/A

1. Replace Q551 Part No BU2508AXLB with 2SD1577LB
2. Change value of R507 from 270 ohms 1watt Part No (ERG1FJ271)
to 100 ohms 1watt Part No (ERG1FJ101)

Description Order Code
Q551 Transistor BU2508AXLB
Q551 Transistor 2SD1577LB
R507 Resistor 100 ohm 1watt
KIT ALL ABOVE ITEMS. 33000YR