Re: JVC XL-EX70 no power on stanby
Tried to move both motors with a 1.5v feed and they move slowly, but moves.
I can't guess where is the fault, why the screen flickers with the circuit of the cd disconnected, and there should be some short or high drain because when I connect it screen goes out....
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Re: JVC XL-EX70 no power on stanby
Soldered one 1000uf cap and same voltages, unsoldered many of the smaller ones and all are in spec....
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Re: JVC XL-EX70 no power on stanby
Will check the caps, I have no scope.
The C101 states 16v 6800uf, reading around 7400uf on the meter, seems healthy, not?
many thanks!Last edited by ex250; 09-14-2023, 11:03 AM.
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Re: JVC XL-EX70 no power on stanby
Just checked the feed to the screen and controls, there are some discrepances from my view
on the CN820, from power supply, the pin 7 is 16v not 10v as the scheme, a typo?
on the CN 821 F1 and F2 lines are -29,97v, where should be -25,7v
pins 3 and 4 are 0v and 0,01v and pin 5 is 8.33v
On the feed to the controls, there are 14pin CN802
these are unconnected and with control connected, note the cd player circuit is disconnected and the screen blinks quickly
1 - 0v // 0
2- 4,89v...Last edited by ex250; 09-14-2023, 05:05 AM.
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Re: JVC XL-EX70 no power on stanby
The voltages from the power supply seems ok, but I don't know why with the cd drive disconnected the frontal screen blinks with some text, a short on the drive? there are 2 voltages on the cd drive circuit 8v and 5v, it's safe to inject some voltage to see if there is anything hot?
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JVC XL-EX70 no power on stanby
Hello guys, I purchased this week this CD changer to add to my old Pioneer Hifi, well, just lasted 1 CD playing, tried to open the tray to change it and add a full set of three, but got stuck, no opening tray and no response from any button, power but was not responsive and finally unplugged it. Plugged again and no standby led and nothing works.
Opened the case and there is almost one zenner diode that gets quite hot, enough to evaporate quickly the alcohol.
If I remove from the power supply the CD system, the display blinks, also the temperature of the zenner decreases....
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Re: SDJ01RM vacuum robot not powers on, all dead
Will try to plug all without the gyro, and see what happens, the heating on the ARM was not burning, only a moderately warm temp, if that is shorted too, nothing to do for me then and should find a new board. On that case, what a piece of shit from Xiaomi/Roidmi for such expensive vacuum robot.
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Re: SDJ01RM vacuum robot not powers on, all dead
Well found at I2608D between Pin 16 VDD 3,3v and pin 13 GND are 1,8 ohms (tester threats that like a short), on board same pins 5,3 Ohms, should I consider damaged the I2608D?...Last edited by ex250; 02-13-2023, 02:31 AM.
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Re: SDJ01RM vacuum robot not powers on, all dead
Well, without the caps and the I2608D on the board, the only thing that heats is the main IC, a large 100pin ARM GD32F103 VBT6
Also with the battery the led on the power button light powered on, but without the gyroscope, it's worth putting it all together?
Also say that not sure if its a proper short, between the pins of the capacitors place there are 5 Ohms, continuity test on the tester makes it sound like a short, now I don't know if the gyro chip is bad or the ARM is bad.
Will try to make...Last edited by ex250; 02-13-2023, 02:31 AM.
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Re: SDJ01RM vacuum robot not powers on, all dead
I'm stupid, injected on the Vin side, make a mistake reading and the Vout is the pin 2 of the regulator.
Tested the regulator alone for proper working and it's ok, 14v in 3,28 out.
Injected with caution from 1v on the out pin, and this time, correctly, and the U9 chip heats up quickly evaporating alcohol, it's named 12608D, I don't know it's function, maybe try a new one in place? it's a gyroscope?
Any ideas?...Last edited by ex250; 02-11-2023, 06:12 AM.
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Re: SDJ01RM vacuum robot not powers on, all dead
Before removing the regulator, just tested voltages at that pin regulator pin 2, somewhat confused, but with the battery plugged, on the Vin there where 14,4v (same as battery +) GND was OK, no heat, until power pressed, the heat appears again. Could be a good idea inject 3v on the Vout line?Last edited by ex250; 02-10-2023, 09:04 AM.
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