Video Part Of Av Board (U, C, A, R, T, P) - Yamaha DVD-S520 Service Manual

DVD-S520/DV-S5450

VIDEO PART OF AV BOARD (U, C, A, R, T, P)

START
END
25
NO PICTURE
CVBS , Y/C , YUV
ACTIVATE
DIAGNOSTIC SOFTWARE
" PLAYER SCRIPT "
NO
CHECK
POWER SUPPLY
±5V AND 3V3
?
YES
NO
CHECK
VIDEO INPUT AT
CONN 1000 &
1010 ?
YES
NO
CHECK
CVBS CINCH
OUTPUT AT
CONN 1005A ?
YES
NO
CHECK
Y/C OUTPUT AT
CONN 1003
?
YES
NO
CHECK
YUV OUTPUT AT
CONN 1006
?
YES
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 TP4 -> CVBS, TP5 -> C,
TP6 -> Y, TP22 -> U, TP23 -> V
• Check the Flex cable to connector 1000 & 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 7413,
7414, 7415, 7416, 7417, 7418 and the biasing
configuration
• Check YUV signal at TP 17, TP18 and TP19
respectively
Check for ±5V supply to Video buffer amplifier
•
• Check the malfunction of Video buffer amplifier
7419, 7420, 7421, 7422, 7423, 7424, 7425,
7426, 7427 and the biasing configuration.