Pioneer PDP-4280HD Service Manual page 59

5
=> DTV
DTV (Digital Terrestrial Video)
is not displayed.
Yes
Is the power-supply voltage of
CN4105 normal?
Yes
When power ON, is RESET_DT
(IC8401 - pin 60) Low after
D+3.3 V standing up?
Yes
Do you communicate by TXD_DT
(IC8401: pin 53) and RXDDT
(IC8401: pin 52)?
Yes
Is the signal from IC6401 to
IC8001?
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Finishing troubleshooting.
No video from USB input
=> USB_R
The image of the USB card
doesn't come out.
Yes
Has the function is selected Home
Media Gallery by Home menu?
Yes
Is the contents list are appear?
Yes
Has the signal come to IC6401?
Yes
Is the signal from IC6401 to
IC8001?
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Replace the MAIN Assy.
5
6
No
Check between CN4105 and
P8 (POWER SUPPLY Unit).
No
Check around IC6902.
No
Check between IC8401 (pins 52,
53) and IC6401 (pins 385, 466).
Exchange IC6301.
No
Check between IC6401 and
IC8001. Exchange IC6401 if there
is no problem.
No
The panel is defective.
No
Select the input of specification
by the input switch.
No
Has USB memory or digital camerra
is connected to USB connecter?
No
Check around USB connecter or
USB cable and check between
pins 2, 3 of CN4110 and pins 302,
391 of IC6401.
No
Check between IC6401 and
IC8001. If there is no problem
then replace IC6401.
No
The panel is defective.
6
7
NG
Replace the MAIN Assy.
NG
Insert USB device such as
USB flash memory.
NG
Replace USB cable.
PDP-4280HD
7
8
A
B
C
D
E
F
59
8