Philips BDL4785SL/00, Service Manual

Page: 135 / 141

BDL4 7 85 S L LCD 135
Repair Flow Chart
S yste m power ON ?
Check U30
Ε
U31
Ε
U3 2
Ε
U33
Ε
U34
output volt ag e
(1.8V,3.3V, 2 .5V,105V,1.05V,1. 2 V, 2 .0
V) is correct
Check which one is fa il?
B a ck li g ht on ?
Yes
No
Check wire c a ble connection between b a ck li g ht a nd power bo a rd
Yes
No
Input si g n a l displ a y
“
No
O S D i mag e ok ?
Yes
No
Check J 22 LVD S c a ble connection
Check input c a ble
1.Check IR/Li g n wire c a ble
Ε
Audio wire c a ble or S ensor wire
c a ble to check which one is short to c a use this fa il
2 . Check keyp a d bo a rd NG or OK
No
Keyp a d LED ON ?
1. Check wire c a ble connection between ma in bo a rd a nd keyp a d
2 . Check VCC 5V in
No
Yes
Yes
Audio ok
“
Function ok
No
1 Ε Check a udio input c a ble connection
2
Ε
Check wire c a ble connection between a udio bo a rd a nd ma in
No
Check ma in bo a rd f unction
Yes
Yes