Power in Solo2.

Discussion in 'VuPlus Solo2 Hardware troubles and Repair support.' started by Piotrekop, Jan 4, 2021.

  1. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    @Johnny B.
    1. Can you tell if there is no power in Solo2. What could be the cause of the failure except for the power supply?

    2. If Solo2's display shines a little less, is there a capacitor responsible for it? If so, which one?
    Thanks,
     
  2. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    Will it be correct to replace U801 chips in solo2? Is it supposed to be an unregulated voltage regulator with 5V output? This is the terribly delicate part. It fell into pieces during desoldering.
     
  3. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,406
    Likes Received:
    1,151
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Sorry for the delay of replying, but I have it very busy today. I need a lot things to do, while a day only have 24 hours.

    But when it fell in pieces after a removal, then you may assume that is was already defective.
     
  4. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    I was successful with the Solo2 power supply. There is power after replacing the voltage regulator. Thanks Johnny again.

    Returning to the dimmed display, I replaced the smd capacitor with a new polymer one. Unfortunately, this does not affect the brightness of the display. Maybe all capacitors like Duo2 should be replaced?

    In Duo2 this has had an effect and the display is brighter. I did the test and replaced the front panel from the second Duo2 with old capacitors and there was a difference. Then it shone worse.

    Solo2 is different, and maybe it's the display itself.
     
    Johnny B. likes this.
  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,406
    Likes Received:
    1,151
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    I think, when you have the voltages on the front panel connector as this picture shows, then you may assume that it could be a front panel issue.
    Unfortunately I have no measurement with the front panel connected because I don't own one.
     
    Piotrekop likes this.
  6. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    I was wondering. Some points on the display glow brighter and some are darker. Logically, when analyzing it, there should be a defective capacitor, but its replacement did not change anything. The problem with the dim display on Solo2 also happens as far as I know. I attach photos of the front panel plate. Maybe you'll have an idea.
     

    Attached Files:

  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,406
    Likes Received:
    1,151
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    These types of displays can deteriorate after a long period of use, and it can also happen that some places were used more than others.
    But as far as I see on the picture it gives me the impression that it not has been used for a long time.

    But if it is the whole display that is dim then maybe it could be the L701 coil.
    In any case measurable, the in/out vdc must be the same.
    If not, re-soldering the display pins can sometimes help too.
     
  8. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    You wrote that you don't have a front panel, so I did a voltage measurement on the Solo2's active front panel. The tensions are a little different.
    Pins:
    1. GND
    2. 2.05V
    3. 4.99V
    4. 5.16V
    5. 11.87V
    6. xxx
    7. xxx
    8. 3.28V
    9. 4.98V
    10. 4.97V
    11. 4.96V
    12. 4.96V
    13. 4.96V
    14. 4.96V
    15. xxx
    16. GND

    I also replaced the front panels of the second Solo2. There was no improvement in the lighting quality of the display so either it's the fault of the display itself or how you wrote the L701 coils. The voltage of the L701 coil is 11.90V. The defect consists in a point dimmer of the display. I have this effect in 3' Solos2. You can see these points in the photo. The photo distorts the live effect a bit. You wrote about the coil. Does she have an effect on spot darkening? I sold the display pins and no changes.
     

    Attached Files:

    Johnny B. likes this.
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,406
    Likes Received:
    1,151
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Thanks for the measurements, however it is a bit unlogic that you not have the voltage at pin 15.
    Or you have measured it incorrectly, or you have a issue with the connection to it, or a issue with the 2K7 resistor.
    See this drawing, the connector info above.

    Q: You wrote about the coil. Does she have an effect on spot darkening?
    A: No one or more spots issues can not be due a main voltage, it seems to me rather a bad quality display or just a display with a few issues.
    Anyways, based on the picture you showed, it seems to me that the display is good enough to work with.
     
    Piotrekop likes this.
  10. Piotrekop

    Piotrekop Member

    Messages:
    90
    Likes Received:
    16
    Trophy Points:
    8
    I've been wondering about that too. I took measurements in two different Solo2s. Both measurement results are identical.
    In fact, if you remove the thin cable from the motherboard P702 port, the voltage is 5V. If you insert a thin cable into the P702 port, there is minimal voltage on the other side of the thin cable in the front panel. I checked these resistors. They all have 2.70kOhm and have a voltage of 5V.

    After all, the display shines much worse than in the second Solo2 ....
     
    Last edited: Jan 12, 2021