Hi KK sir, pure hifi & viewer,
Attached is my VFD, is the part A the power supply to VFD (photo 1), i had check the volatage ~2.8v.
i had check the voltage for the 10cable in part be, reading follow sequence from the bottom refer to grn is :
1) 0.008V(almost zero)
cable 2,3,5 to 10 all got voltage some is ~2.5 some is ~5v.
So still not display at VFD.
Some time can play CD sometimes cannot play. On normal condition when the CD place inside, teh laser head will scan and activate the motor to turn the CD when rach certain speed, it will activate the MCU to continue the reading.
If my case is that when disc place insides, the laser head will still scan, it will active the motor but the motor sometimes like no energy/power to turn, when i press "play" can hear teh laser head activate the motor but motor 12 turn but no energy or turn <1sec then power to the motor like auto cut off.... if the luck is good that the motor can turn >1sec to achied certain speed the MCU will be activate to play the disc.
1)So my question is that which part decide/proved the power to the motor to run at initial scanning state before take over by MCU?
Is any capacitor incharge to provide enough power to the motor?
2)can it be the laser head is almost dead? since there is 1 time after i clean the head, it can play the clone CD but afetr power off >1hr then back to the sma e situation(can't play).
3) If the laser head is dead, can i repalce only the laser head only? can i change teh laser head to other brand/model?
4) how can i check to prove that the VFD is dead?
Besides, i had measure the voltage at a cable(board write as RST) the power is voltage is very low ~0.006v is it normal? |