TH-37PA20U TH-42PA20U (Service Bulletin # SB-B19-04-
01)
IC551 Failure
Due to internal defect of IC551, the unit could intermittently shut down or go into
stand-by mode.
When this happens, the power LED blinks 5 or 7 times. Often times cycling the
power off and on.
To correct this problem, replace IC551 with an improved IC as indicated on the
Service Bulletin number SB-B19-04-01.
This modification applies to units with serial numbers less than or equal to
YD3510432 regardless of the original complaint or symptom.
Order part number C5HABZZ00123.
Note: Units with serial numbers greater than YD3510433 already have an
improved IC551 and are not affected.
Warranty Codes:
•
Symptom Code: Use INTD for Intermittently dead units or DEAD depending
on actual symptom.
•
Repair Code: Use MODS when replacing IC551 to reference this bulletin.
Figure 47 - IC551 location on the D board
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