Service manual

SERVICE MANUAL (BSV-4251 BSV-4251A )
MODEL NAME DOCUMENT NO REVISION NO REVISION DATE PAGE
TROUBLE SHOOTING
1. hecking for no Picture
ondition of black pattern or power off.
(2) Check the power and signal cable of CTRL B/D.
to CTRL B/D.
with oscilloscope(more than 200MHz)
elow figure.
OM)
(6) C
(7) C
2. Hitch Diagnosis Following Display Condition
-1. 4/7 or 3/7 of the screen doesn’t be shown
(1) Confirm the power connector of X B/D is well plugged in which is correspond to not showing screen.
part.
(3) R e relevant X B/D.
Relationship between screen and X B/D
Display X B/D
C
󰚟A screen doesn if display at all and c
(1) Check whether the CTRL B/D LED(D1~D4) is turned on or not.
(3) X B/D, Y B/D, Z B/D is well plugged in.
(4) Check the connection of X B/D, Y B/D and Z B/D
(5) Measure the output wave of X, Y, Z B/D
and find the trouble of B/D by comparing the output wave with b
- Measure Point fo Y B/D : TP (Connector P4 80 pin)
- Measure Point fo Z B/D : Connection part of panel (SUS_OUT)
- Measure Point fo X B/D : L1(RIGHT), L2(LEFT BOTT
heck the SCAN(Y side) IC
heck the DATA(X side) COF IC
(8) Replace the CTRL B/D.
2
(2) Confirm the connector that is connected between CTRL B/D and X B/D correspond to not showing
eplac
Left o 4/7
Right X B/D
f the Screen
Right of the Screen 3/7
Left X B/D
BSV-4251/4251A RD(1) 00 03/10/23 53/75