Sony KE-42M1 Service Manual page 31

Defect: 32. Remaining image
Symptom: The previous pattern does not disappear
after a new pattern appears.
Example) 50"HD module: Cross Hatch pattern (30
seconds) Full White Pattern Considered as
defective if the image remains for 30 seconds or
more.)
Cause :
(1) Panel : Inside moisture or impure gas/Phosphor
and dielectric element/Exhaust and adhesion
condition/Aging condition
(2) Circuit : X, Y Sustain Pulse angle and width
Defect: 33. Abnormal noise
Symptom: Panel or circuit board noise
1) Noise caused by panel (exhaust pipe) damage
2) Noise caused by element vibration due to
insufficient soldering on circuit
Cause :
(1) Panel: Barrier rib uniformity/Adhesion clipping
defect
(2) Circuit : Parts vibration/Insufficient soldering/Drive
FET switching noise
(3) Operation : Panel or exhaust pipe crack
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