Sony KE-42M1 / KE-MV42A1 / KE-MV42M1 / KE-P42M1 Service Manual ▷ View online
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Defect: 20. F/White Low Discharge
Defect: 21. Weak discharge
Symptom: Low discharge caused by unstable cells
occurring at Full White pattern of high (60 degrees) or
normal temperature.
Cause :
(1) Panel: MgO source/Dielectric thickness/Cell
pitch/Phosphor
(2) Circuit : Drive waveform/Voltage condition
Symptom: Normal discharge, but cells appear darker
due to weak light emission occurring mainly at low (5
degrees) Full White/Red/Green/Blue patterns or
gradation pattern.
Cause :
(1) Panel : MgO deposition count and thickness/Aging
condition
(2) Circuit : Drive waveform/Voltage condition
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Defect: 32. Remaining image
Defect: 33. Abnormal noise
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
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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Defect Name: 37. Panel Damage
Defect Name: 38. Exhaust Pipe Damage
Symptom : Panel crack or break. No image appears
in some cases, depending on the damaged part and
damage level.
Cause :
(1) Manufacturing : Flatness/Palette pin interruption
(2) Operation : Overload of panel corner/Careless
handling
(3) Panel: Flatness/Assembly error.
Symptom: Crack or break of exhaust pipe. An image
is partially lacking or the panel noise occurs,
depending on the damaged part and with the passage
of time.
Cause : Careless panel handling
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5. DISASSEMBLING/REASSEMBLING
5-1. Tools/Measurements
Electric screwdriver,
Oscilloscope,
Multi-meter,
etc
5-2. Exploded
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