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
- Typical Li‑ion single cell is 3.7V nominal, 4.2V when fully charged; two-cell packs are 7.4V nominal, 8.4V full. [Elektroda, gradek83, post #16728808]
- Some Kiano models charge only through the dedicated power jack, not the USB/OTG ports. [Elektroda, gradek83, post #16725582]
- Reported charger IC on this board: EUP8207 (also marked LP28200A). [Elektroda, gradek83, post #16726755]
- Diagnostic reading seen: EUP8207 pins 2 and 3 measured 5.14V with fault present. [Elektroda, seba1001, post #16726939]
- Field readings showed two cells at 2.8V and 1.8V with a sweet odor, indicating battery damage. [Elektroda, seba1001, post #16731529]
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)?
- Desolder and remove the battery pack.
- Plug the tablet into its power jack.
- 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]
