Hitachi 32PD3000E, Руководство по обслуживанию

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79
No ITEM POTENTIAL PROBLEM/QUESTION CAUSE and COUNTERMEASURE/ADVICE NOTE
1 CVBS &
S.INPUT
SOFTER CVBS and S-VHS input is softer than
CL32PD2100 (with NR=off).
When DVD signal input through AV1, Front by
CVBS or S-VHS, picture is soft. CAUSE ;
DVD output signal includes noise equivalent to picture
frequency.
CL32PD2100 displays a picture more detail with NR=off
than 32PD3000 but DVD noise is also emphasized especially
seeing sky, you can see dot noise on
CL32PD2100.
32PD3000 is filtered noise so you cannot see noise but a
picture is also becoming softer.
ADVICE;
CVBS and S-input is not good for demonstration. Because
almost all DVD has RGB, please use RGB for demo or
YCbCr/YpbPr instead (new feature) RGB input of 32PD3000
is more crisp and less noise than CL32PD2100.
2 BLACK LEVEL
BRIGHT
(Black
level set- up)
CVBS and S-output from DVD player has set up
voltage of black level around 0.1V.
This causes black brighter and loose contrast.
This was found with DVD player DV P305 with
Spanish DVD disc. I have never found the same
phenomenon in any other places so far. In HEL, I
have checked DV P305 with UK DVD disc and
confirmed OK (no set up voltage) In Italy, this
was not found with DVD player DV P250 with
Italy DVD disc. CVBS and S-input
from DVD The set up black level is not expected on PAL signal. So
something wrong probably when DVD disc is copied in
Spanish DVD software company. Or Some DVD player may
have potential cause of this problem. But it is recommended
that the demonstration should be done by RGB or component
input to avoid this phenomenon. Almost all DVD players
have RGB output. This is observed only
in Spain.
This is caused by DVD
player option. DV
P305 has menu option
to switch SET UP >
DISPLAY OPTION >
BLACK LEVEL =
On/Off. When it is set
to On, the signal on left
hand drawing is output
from DVD.
3 LTI EFFECT
Luminance
Transient
Improvement
PICTURE > MORE > LTI
LTI effect is not significant in CVBS and S-
INPUT but very significant on RGB and
component input.
CL32PD2100 has LTI but it is so strong that noise is also
emphasised very much. On 32PD3000, this is improved to
effect clear signal avoiding noise enhancement.
4 NOISE
REDUCTION
EFFECT PICTURE > MORE > YNR
PICTURE > MORE > CNR
Noise reduction effect is not as strong as
CL32PD2100. CL32PD2100 is too strong to give
crisp picture. Instead, there are 2 types Noise
Sometime on TV, noise appears close to colour frequency.
By previous noise reduction, when this noise is reduced by
NR feature, it affect luminance causing loose of picture
sharpness. CNR only reduce this noise without affecting
picture sharpness.