Video Part Of Av Board (G, B) - Yamaha DVD-S520 Service Manual

VIDEO PART OF AV BOARD (G, B)

START
CVBS , Y/C , RGB
DIAGNOSTIC SOFTWARE
" PLAYER SCRIPT "
POWER SUPPLY
YES
VIDEO INPUT AT
YES
YES
YES
RGB OUTPUT AT
YES
END
NO PICTURE
ACTIVATE
NO
CHECK
±5V AND 3V3
?
NO
CHECK
CONN 1001 &
1010 ?
NO
CHECK
CVBS OUTPUT
AT CONN 1005A
& 1002 ?
NO
CHECK
Y/C OUTPUT AT
CONN 1003
?
NO
CHECK
SCART CONN
1002?
VIDEO PART
OK
• To activate the "Player Script ", connect to MAINS
while pressing Open/Close and Stop keys on the
local keyboard of the DVD player simultaneously.
• Proceed to the nuclei "VideoColDencOn" by pressing
NEXT key until display shows "APP PIC-1".
• Check supply voltages at connector 1010
Pin 9 -> -5Vstdby
Pin 10/11 -> +5V
• Check 3V3 regulator 7203 and safety resistor 3209 ,
3237
• Check the delay cct 7512 , 3238 , 3239 , 2237
• Check the Flex cable to connector 1010
• Check Mono Board
Check video signal at TP1 -> B_Vid , TP2 ->G_Vid
•
TP3 ->R_Vid , TP4 ->CVBS , TP5 ->C , TP6 -> Y
• Check the Flex cable to connector 1001 & 1010
• Check Mono Board
• Check CVBS signal at testpoint 14
Check for ±5V supply to Video buffer amplifier
•
Check for malfunction of Video buffer amplifier 7508,
•
7509 , 7510 , 7511 and the biasing configuration
• Check Y /C signal at TP 16 and TP15 respectively
Check for ± 5V supply to Video buffer amplifier
•
• Check for malfunction of Video buffer amplifier 7404,
7405, 7406, 7407, 7408, 7409 and the biasing
configuration
• Check RGB signal at PIN 15, 11, 7 respectively
respectively
Check for ±5V supply to the Video buffer amplifier
•
DVD-S520/DV-S5450
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