Zenith XBV613 Service Manual - Page 20

Osd Circuit

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2. SERVO CIRCUIT (4) KEY doesn't working KEY doesn't working. Is 5V applied to IC501 NO Pin99? YES Does LED or FLD change NO when a function button is pressed? 4. OSD CIRCUIT (1) No OSD display. No OSD or F.OSD display. Refer to "SMPS 5.3VA Trouble Shooting". Replace the defective switches. Is 5.3V applied to NO IC501 Pin53? YES Does oscillation occur at NO IC501 Pins44, 45? YES Replace IC501. Refer to "SMPS 5.3VA Trouble Shooting". Check or Replace the pheripheral Circurity.(L511, R518, C596, C595) (2) I2C BUS CHECK The I2C waves don't come out. Does Power appear at the NO Pull up impedence (R569, R507)? YES Replace IC501. Refer to "SMPS 5.3VA Trouble Shooting". 3-9

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3-9
KEY doesn
’
t working.
Is 5V applied to IC501
Pin99?
Does LED or FLD change
when a function button is
pressed?
Refer to
“
SMPS 5.3VA
Trouble Shooting
”
.
Replace the defective
switches.
YES
NO
NO
2. SERVO CIRCUIT
(4) KEY doesn
’
t working
4. OSD CIRCUIT
(1) No OSD display.
(2) I
2
C BUS CHECK
No OSD or F.OSD display.
Is 5.3V applied to
IC501 Pin53?
Does oscillation occur at
IC501 Pins44, 45?
Replace IC501.
The I
2
C waves don
’
t
come out.
Does Power appear at the
Pull up impedence
(R569, R507)?
Replace IC501.
Refer to
“
SMPS 5.3VA
Trouble Shooting
”
.
Check or Replace the phe-
ripheral Circurity.(L511,
R518, C596, C595)
Refer to
“
SMPS 5.3VA
Trouble Shooting
”
.
YES
YES
YES
NO
NO
NO