Check the USB device being used
YES
Is the USB device supported by this unit?
Is a USB hub being used?
This unit supports devices in the FAT16- and
FAT32-formatted mass storage class, MTP-
compatible devices and iPod devices (except for
some models).
Do not use a USB hub.
NO
Checking the unit
YES
YES
Can a voltage (5V) be conî™°rmed between pin 1
and pin 4 of JK601 (USB Connector) on FRONT
PCB?
The USB signal circuit between CY920 and JK601 of the FRONT PCB are faulty.
Are CN321 of the DIGITAL PCB and BN605 of the
FRONT PCB correctly connected?
The circuit around IC503 of the DIGITAL PCB is
faulty.
Connect the connectors correctly.
5.3. Cannot recognize the connected USB device
YES
NO
NO
NO
Checking the unit (If no picture is output)
YES
• Check the VIDEO circuit.
Are digital video signals(920PCK, 920VD0 -
920VD7) output from CY920 to IC421 (V.PLD)?
Checking the unit:(If no sound is output)
YES
YES
Check the IC251 (DSP) AUDIO circuit and the circuits thereafter.
Are the I2S signal output to pins 26, 28, 30 and
34 of the CN501 DIGITAL PCB ?
(The 30, 32, 34pin in the case of DSD)
Are audio signal output to D1_F/FL of Test point
on DIGITAL PCB.
5.4. No picture or sound is output
The circuit around CY920, IC421 (V.PLD) is faulty.
The CY920 is faulty.
The circuit around IC221 (A.PLD) is faulty.
NO
NO
NO
s
95
Caution in
servicing
Electrical Mechanical Repair Information Updating
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