VR168 - 923-03485
3-7
D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING (CONTINUED)
(3)
KEY doesn't work.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
N
O
NO
YES
NO
N
O
Replace the defective
switches.
KEY doesn’t work.
Is 5V applied to
IC501 Pin 15?
Does LED or FLD change
when a function button is
pressed?
Refer to “SMPS 5.3VA
Trouble Shooting”.
4. OSD CIRCUIT
1) No OSD display.
2) No F.OSD display.
No OSD display.
Is 5.3V applied to
IC501 Pin 42?
Does oscillation occur at
IC501 Pins 52, 53?
Does oscillation occur at
IC501 Pins 50, 51?
Replace IC501.
No F.OSD display.
Refer to “(1) No OSD
display”.
Does the C.SYNC signal
appear at IC501 Pin87?
Replace IC501.
(3) I2C BUS CHECK
Check or Replace the
Peripheral Circuitry. (L506,
R517, C519, C518, R518)
The I2C waves don’t
come out.
Does Power appear at
the Pull up impedence
(R508, R510)?
Replace IC501.
Refer to “SMPS 5.3VA
Trouble Shooting”.
Is the oscillation input to
Q501 base?
Refer to “AVCP. C. Sync.
Trouble shooting”.
Check or Replace the
Peripheral Circuitry. (L506,
R517, C519, C518, R518)
Check whether X301
oscillates
Refer to “SMPS 5.3VA
Trouble Shooting”.
All manuals and user guides at all-guides.com
Содержание XBV243 series
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