HP PL4260N - 42" Plasma TV, Service Manual

Page: 163 / 245

English
2-8. The screen has one several vertical
line.
(1) In this case, It isn’t a problem about CTRL B/D or X B/D.
(2) It may cause followings.
- It’s out of order a panel
- Open or short of DATA TCP attached panel
- It’s out of order a DATA TCP IC attached panel
(3) Replace Module.
Screen Display Form
2-9. The screen has one or several
horizontal line.
(1) In this case, it isn’t a problem about CTRL B/D or Y B/D.
(2) It may cause followings.
- It’s out of order a panel
- Open or short of SCAN FPC attached panel
- It’s out of order a SCAN IC attached panel
(3) Replace Module.
Screen Display Form
2-10. Lightness of screen is wholly darken
though there is input-signal-pattern
(1) In this case, Z B/D operation isn’t complete.
(2) Check the power cord of Z B/D.
(3) Check the connector of Z B/D and CTRL B/D.
(4) Replace the CTRL B/D or Z B/D.
2-11. The screen displays other color
partially on full white screen or
happens Mis-discharge partially on
full black screen.
(1) Check the declination of Y B/D set up, set down wave.
(2) Measure each output wave with oscilloscope(more than
200MHz) and compare the data with below figure data. The
slope of set_up in B/D is VR3, The slope of set_down is
VR2, The voltage of -Vy and Vscan is respectively PS101
and PS 102. for these, Vzd of Z B/D adjust as indicated in
Label by making Z B/D of Waveform variable.
- Measuring Point of Y B/D : Waveform on Y DRV B/D
- Measuring Point of Z B/D : B28
The set value of above A and B can be adjusted with in the
variable range considering the mass production capability
because it is a Typ. Value.
2-12. It doesn’t display a specified
brightness at specified color
(1) Check the connector of CTRL B/D input signal.
(2) Replace the CTRL B/D.
It may show several vertical lines
in a quarter or other division part
of screen including left case.
It may show several horizontal lines
including left case.