Sony KDE-V42A12U / KE-V42A10E Service Manual ▷ View online
4.2 DEFECTS, SYMPTONS AND DETECTIVE PARTS
Condition Name
Description
Related Board
■ No Display
Operating Voltages exist, but an Image
doesn't exist on screen
PSU, Y-MAIN, X-MAIN, Logic Main,
Cables
■ Abnormal Display
Abnormal Image(not open or short) is on
screen.
Y-MAIN, X-MAIN, Logic Main
■ Sustain Open
some horizontal lines don't exist on
screen
Scan Buffer, FPC of X / Y
■ Sustain Short
some horizontal lines appear to be
linked on screen
Scan Buffer, FPC of X / Y
■ Address Open
some vertical lines don't exist on screen
Logic Main, Logic Buffer, FFC,TCP
■ Address Short
some vertical lines appear to be linked
on screen
Logic Main, Logic Buffer ,FFC,TCP
◈ Defect: Address(vertical stripe) Open
◈ Defect: Address(vertical stripe) Short
■ Symptom : A line or block does not light up in address
electrode direction.(1 line ,block open)
■Cause
① manufacturing : Panel electrode single line/
foreign material./electrostatic/TCP defect
② Parts : TCP, Board connection defect
③ Operation : Assembly error / Film damage
■ Symptom: Another color simultaneously appears because adjacent
data recognizes the single pattern signal
■Cause
① manufacturing : Panel electrode short / Foreign material
conductive foreign object inside TCP
② Part : TCP/buffer defect lighting electrode cutting
defect
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◈ Defect: Address output error
◈ Defect: Sustain(horizontal stripe) Open
■ Symptom.: A defect other than address open
and short Data printout signal error
occurring at certain Gradation or pattern
■ Symptom : One or more line do not light up in Sustain direction
■Cause : ① manufacturing : .Panel bus electrode single line
FPC pressure defect
② Parts : FPC/board/connection disconnection
③ operation : assembly error.
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◈ Defect: Sustain(horizontal stripe) Short
◈ Defect: Dielectric material layer damage
■Symptom : Combined or adjacent lines are short in
sustain direction. The line appear brighter
than other at Ramp gradation pattern or low
gradation patter
■Cause
① manufacturing : Panel electrode short/Foreign
material.
② Parts : Board/ connector/pin error
③ Operation : connector / assembling error
■ Symptom: Burn caused by the damage of address bus dielectric
layer appears in the panel discharge/non discharge
area. sustain also open/short occurs by the damage
of address sustain printout
<Add Block and Line Open>
<Add and Sustain Open>
■Cause : layer uneven / abnormal voltage / foreign material
repair failed
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◈ Defext: F/White low discharge
◈ Defect: Weak discharge
■Symptom : Low discharge caused by unstable cells
occurring at full white pattern if high
(60 degree) or normal temparature.
■ 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 degree) Full white/Red/Green/Blue pattern
or gradation pattern
■ Cause
① Panel : MgO deposition count and thinckness /
aging condition
② Circuit : drive waveform/ voltage condition
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