logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions

seba1001 8811 11
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 16724306
    seba1001
    Level 10  
    Hello. I have a problem with a Kiano tablet, the device does not want to charge the battery on a connected charger. It turns on only on the charger for a moment and then turns off immediately. I took apart the tablet and measured the voltage on the 4.7V battery. After switching on, it squeaks all the time to connect the charger. Maybe anyone has any idea?
    Attachments:
    • Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions IMG_0870.JPG (110.67 KB) You must be logged in to download this attachment.
    • Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions IMG_0869.JPG (104.08 KB) You must be logged in to download this attachment.
  • ADVERTISEMENT
  • ADVERTISEMENT
  • #3 16724927
    gradek83
    Level 43  
    Desolder the battery, plug in the charging, check the voltage on the pads where the battery was soldered.
  • #4 16725335
    seba1001
    Level 10  
    I have already checked 0.32V.
  • #5 16725582
    gradek83
    Level 43  
    .... it should be around 4.20V
    Peel off this cover so that the electronics can be seen and add clear photos in high resolution.
    Of course, you connected the power supply to the power socket and not to one of the USB from what I remember, some KIANO models only charge the battery from the power socket. And the USB sockets are HOST USB and the other separate is the OTG socket.
  • ADVERTISEMENT
  • #6 16726090
    seba1001
    Level 10  
    So I connected to the power socket, that's exactly how you write 2 usb and one power supply

    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
  • #7 16726755
    gradek83
    Level 43  
    Check the charging system
    EUP8207

    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
    Wide supply voltage range:
    4.8V to 20V - 4.2 version
    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions

    Other designation of the LP28200A system
    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
    Attachments:
    • EUP8207.pdf (649.55 KB) You must be logged in to download this attachment.
    • LP28200.pdf (833.4 KB) You must be logged in to download this attachment.
  • #8 16726939
    seba1001
    Level 10  
    Thanks for helping me out on the weekend after checking out

    Added after 18 [hours] 51 [minutes]:

    I measured the voltage according to EUMP 8207 diagram,
    1- 0
    2- 5.14V
    3- 5.14V
    4- GND
    5- 0
    6- 0.25V
    7- 0.25V
    8-0
  • ADVERTISEMENT
  • #9 16728700
    gradek83
    Level 43  
    seba1001 wrote:
    battery voltage 4.7V

    Have you measured this voltage on a soldered battery?
    What battery does it go there? 3.7V or 7.2V?
  • #10 16728763
    seba1001
    Level 10  
    It's hard for me to say they are 2 connected together. I have an idea to buy rechargeable batteries together to 4.8V and try if it will work. The charger is 5v 2A. I measured on a soldered battery


    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
  • #11 16728808
    gradek83
    Level 43  
    The battery is usually on:
    3.7V max charged to 4.2V
    and
    7.4V max charged to 8.4V

    Strip these black tapes and check each link separately.
    Provide the model of this KIANO
    And smell if the battery does not smell such a sweet smell lithium, if so it is damaged put it in a bag and close tightly and recycle the vapors are poisonous.
  • #12 16731529
    seba1001
    Level 10  
    The battery smells sweet. Kiano 10 Dual. One cell has 2.8V. The other has 1.8V
    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions


    Kiano Tablet Charging Issue: Turns On Briefly, Battery Voltage 4.7V - Seeking Solutions
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around a Kiano tablet that fails to charge, turning on briefly before shutting down. The user measured the battery voltage at 4.7V and reported a continuous squeaking sound when attempting to power it on with the charger. Suggestions include testing with a different battery, desoldering the battery to check voltage on the pads, and ensuring the charger is connected to the correct power socket, as some Kiano models only charge from the power socket. Further measurements revealed voltages of 0.32V and 5.14V at various points in the charging system. The user identified the battery as having two cells, with one at 2.8V and the other at 1.8V, and noted a sweet smell indicating potential damage. The model in question is the Kiano 10 Dual.
Generated by the language model.

FAQ

TL;DR: For Kiano 10 Dual charge faults, target battery pad voltage is 4.20V; as one expert says, "it should be around 4.20V." Diagnose via the power jack and charger IC first. [Elektroda, gradek83, post #16725582] Why it matters: This FAQ helps DIY repairers quickly isolate battery vs. charge-path faults without guesswork.

Quick Facts

How do I fix a Kiano tablet that turns on briefly and then shuts off while on the charger?

Use the dedicated power jack, not USB. Expect around 4.20V at the battery pads when charging. If pads stay low, inspect the charge path and the power connector. “It should be around 4.20V.” [Elektroda, gradek83, post #16725582]

Is a 4.7V battery reading normal for this Kiano tablet?

Single Li‑ion cells are 3.7V nominal and 4.2V full. Two-cell packs are 7.4V nominal and 8.4V full. A 4.7V total suggests either a single cell overvoltage reading error or a partially discharged two-cell pack. Measure each cell separately to confirm configuration. [Elektroda, gradek83, post #16728808]

How can I check charging voltage safely without the battery connected?

Desolder the battery first. Plug in the charger, then measure the voltage at the battery pads. Compare the reading to the expected ~4.2V per cell. This isolates the charger circuit from a bad pack. [Elektroda, gradek83, post #16724927]

What do EUP8207 pin readings like 5.14V on pins 2 and 3 indicate?

Those measurements confirm charger input presence on a faulted unit. Continue by checking whether the battery pad rises toward ~4.2V when the pack is disconnected. If not, focus on the charger IC and surrounding components. Reported inputs were 5.14V on pins 2 and 3. [Elektroda, seba1001, post #16726939]

Can I charge a Kiano 10 Dual through USB instead of the power jack?

No. In this series, the USB ports act as Host/OTG, while charging is through the dedicated power socket. Using USB will not charge the battery or will behave unpredictably. Always use the barrel power input for charging. [Elektroda, gradek83, post #16725582]

The tablet keeps beeping to connect a charger even when plugged in—what does that mean?

That symptom matches an undervoltage or charge-path fault. Verify you’re on the power jack, then check pad voltage with the battery disconnected. If voltage stays low, inspect the charger IC and power jack solder joints. [Elektroda, seba1001, post #16724306]

What battery configuration does the Kiano 10 Dual use?

A user report shows two cells connected together in the pack. Confirm by removing tape and measuring each cell. Replace the pack if cells differ greatly or show damage. A photo in-thread shows the dual-cell layout. [Elektroda, seba1001, post #16728763]

What should I do if the battery smells sweet?

Treat it as damaged. The guidance is to bag it, seal it, and recycle promptly. Do not continue testing or charging a pack with a sweet, solvent-like odor. “The vapors are poisonous.” [Elektroda, gradek83, post #16728808]

What voltage should I see at the battery pads during proper charging?

Expect approximately 4.20V per cell at the pads when the charger path works. If you read far below this, focus on the charging IC and connector integrity. “It should be around 4.20V.” [Elektroda, gradek83, post #16725582]

One cell reads 1.8V—can I recover it safely?

Do not attempt to revive a severely discharged, smelly cell. The thread flags such packs as damaged. Discontinue use, seal the pack, and recycle. Continuing may risk venting or further failure. [Elektroda, gradek83, post #16728808]

Which charger IC is on this Kiano board, and are there alternate markings?

The charging controller shown is EUP8207. An alternate marking noted is LP28200A. Use this info to find a datasheet and pinout for targeted diagnostics and replacement. [Elektroda, gradek83, post #16726755]

I measured only 0.32V on the battery pads with the pack removed—what next?

That indicates the charger output is not rising toward charge voltage. Inspect the charging IC area, input path, and connector. Continue tests from the power jack inward to locate the drop. Re-check after any rework. [Elektroda, seba1001, post #16725335]

How do I run a quick 3‑step isolation test (battery vs. charger path)?

  1. Desolder and remove the battery pack.
  2. Plug the tablet into its power jack.
  3. Measure voltage at the battery pads and compare to ~4.2V per cell; proceed based on the result. [Elektroda, gradek83, post #16724927]

Which physical ports should I use during charging diagnostics on this model?

Use the dedicated power socket. The unit pictured has two USB ports and one power input; charging relies on the power input. Misusing USB can mislead your diagnosis. [Elektroda, seba1001, post #16726090]

Do measured cell voltages of 2.8V and 1.8V explain the random shutdowns?

Yes. Those readings indicate an imbalanced and deeply discharged pack. The device will shut down despite external power. Replace the pack before further tests to avoid chasing false faults. [Elektroda, seba1001, post #16731529]

Should I try a different battery pack before deeper repairs?

Yes. Swapping in a known-good pack can quickly confirm a battery fault. It saves time before reworking tiny charger ICs or power jacks. A contributor recommended this early step. [Elektroda, nutergsm, post #16724449]
Generated by the language model.
ADVERTISEMENT