Philips BDL4785SL/00, Service Manual

Page: 8 / 141

8 BDL4 7 85 S L LCD
Troubleshooting
ʳ
Symptom Possible Cause Remedy
No picture is displ a yed
Inter f erence displ a yed on the
displ a y or a udible noise is
he a rd
Color is a bnor ma l
Picture is distorted with
a bnor ma l p a tterns
Displ a y i mag e doesn’t f ill up
the f ull size o f the screen
C a n he a r sound, but no
picture
C a n see picture but no
sound is he a rd
S o m e picture ele m ents do
not li g ht up
A f ter-I mag es c a n still be
seen on the screen af ter the
displ a y is powered o ff .
(Ex am ples o f still pictures
include lo g os, video gam es,
co m puter i mag es, a nd i mag es
displ a yed in 4:3 nor ma l m ode)
1. The power cord is disconnected.
2 . The ma in power switch on the b a ck
o f the displ a y is not switched on.
3. The selected input h a s no
connection.
4. The displ a y is in st a ndby m ode with
VGA.
C a used by surroundin g electric a l
a ppli a nces, tr aff ic or f luorescent
li g hts.
The si g n a l c a ble is not connected
properly.
1. The si g n a l c a ble is not
connected properly.
2 . The input si g n a l is
beyond the c a p a bilities
o f the displ a y.
The zoo m m ode is not correctly set.
I m properly connected source si g n a l
c a ble.
1. I m properly connected source
si g n a l c a ble.
2 . Volu m e is turned a ll the w a y down.
3. Mute is turned on.
4. No extern a l spe a ker connected.
S o m e pixels o f the displ a y ma y not turn
on.
A still picture is displ a yed f or a n
over extended period o f ti m e
1. Plu g in the power cord.
2 . M a ke sure the power switch is switched on.
3. Connect a si g n a l connection to the displ a y.
Move the displ a y to a nother loc a tion to see i f the
inter f erence is reduced.
M a ke sure th a t the si g n a l c a ble is a tt a ched
f ir m ly to the b a ck o f the displ a y.
1. M a ke sure th a t the si g n a l c a ble is a tt a ched
f ir m ly.
2 . Check the video si g n a l source to see i f it is
beyond the r a n g e o f the displ a y. Ple a se veri f y
its speci f ic a tions with this displ a y’s speci f ic a tion
section.
Use the Zoom mode or Custom zoom f unction
in the Screen m enu to f ine-tune displ a y
g eo m etry a nd ti m e f requency p a r am eter.
M a ke sure th a t both video inputs a nd sound
inputs a re correctly connected.
1. M a ke sure th a t both video a nd sound inputs a re
correctly connected.
2 . Use VOL UP / VOL DOWN button to he a r
sound.
3. S witch Mute o ff by usin g the MUTE
button.
4. Connect extern a l spe a kers a nd a d j ust the
volu m e to a suit a ble level.
This displ a y is ma nu fa ctured usin g a n extre m ely
hi g h level o f precision technolo g y:
however, so m eti m es so m e pixels o f the displ a y ma y
not displ a y. This is not a ma l f unction.
Do not a llow a still i mag e to be displ a yed f or a n
extended period o f ti m e a s this c a n c a use a
per ma nent af ter-i mag e to re ma in on the
displ a y. Re f er to CONFIGURATION 1 MENU f or
f urther det a ils.