[Solved] InkBook Classic Reader Won't Turn On: No Response to Reset, Green LED On - Need Advice

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#31 19722445 22 Nov 2021 00:14

westg westg

Level 12

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Post #31
19722445 22 Nov 2021 00:14

Hello,
I got inkBOOK classic, as I presume after the photos above, which also does not turn on, charging is on, the green light is on, I measured the battery while charging is 4.15V after unplugging the 4.07V cable. After pressing and holding power, the green LED lights up for a few seconds and goes out. The screen remains unresponsive with the logo and activation instructions. The reset does not work with or without a cable attached. Connecting to the computer results in displaying empty volumes. PICTURE
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#32 19722474 22 Nov 2021 00:49

gradek83 gradek83

Level 42

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Post #32
19722474 22 Nov 2021 00:49

Take a look at this subject and try to enter Recovery Mode.
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#33 19726437 24 Nov 2021 00:07

gradek83 gradek83

Level 42

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Post #33
19726437 24 Nov 2021 00:07

It's like it would crash during the update anyway, if you are in disk management, select the DATA partition (D and see if a red X appears in the top menu, like so, then remove this partition, disconnect the reader and press reset or turn off by holding the POWER button for a long time. Alternatively, unsolder the PLUS wire from the battery (red) so that you know for sure that the reader has turned off. And then connect the cable and run it and check if it did something or the same thing again. The reset button should work if it does not work, it is possible that the software has crashed.
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#34 19726920 24 Nov 2021 12:38

westg westg

Level 12

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Post #34
19726920 24 Nov 2021 12:38

I got the reader from a friend for my 10-year-old son, if you fix it, it's yours. I don't know his history and I don't know what was done with him.
I am not able to enter recovery because the display does not respond.
I unsoldered and soldered the power (red), inserted a formatted SD card with an image file.
I fired up the reader with the OK button pressed in the middle.
The reader turned on but the screen remained off.
The green LED was blinking for 2-3 minutes and then it turned on with a steady light.
VID2021112...102937.mp4 Download (21 MB)
I waited and plugged it into my laptop.
Still display without reaction.
The D drive as you suggested is my second data drive in my laptop
IMG2021112...111425.jpg Download (5.78 MB)
Disks E and F are those from the reader and, as you can see, they cannot be opened.
But when I took the SD card out of the reader and put it in the computer reader, it turned out that inkBOOK created its own directory structure.
IMG2021112...110548.jpg Download (6.05 MB)
It looks like the display has gone down.
And the computer was not properly detecting the USB device.
IMG2021112...110048.jpg Download (5.06 MB)
IMG2021112...110058.jpg Download (5.41 MB)
IMG2021112...110119.jpg Download (5.75 MB)
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#35 19728276 24 Nov 2021 23:53

gradek83 gradek83

Level 42

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Post #35
19728276 24 Nov 2021 23:53

Take a look at this the topic there, a colleague from the forum provides the display driver, including subject you have information on how such a driver is loaded. Use the SpiFlashTool_v.1.2 program.

Remember that uploading may fail on win 10, my drivers were not compatible, so I recommend using windows XP SP3 or win 7. Mi XP only worked.
#36 20278645 11 Nov 2022 00:46

yofi18 yofi18

Level 8

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Post #36
20278645 11 Nov 2022 00:46

I bought the batteries with three cables on Aliexpress.
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Topic summary

The InkBook Classic reader is experiencing power issues, failing to turn on despite a green LED indicator when connected to a charger. Users suggest that the battery may have deeply discharged due to prolonged inactivity. Recommendations include charging the device for an extended period, checking the battery voltage with a multimeter, and potentially replacing the battery if it is found to be non-functional. The discussion also covers the importance of a thermistor for battery management, with suggestions to transfer components from the old battery to the new one to ensure proper charging. A user successfully replaced their battery but encountered slow charging issues, attributed to the absence of a thermistor in the new battery. Troubleshooting steps include measuring voltages and attempting to enter recovery mode for software issues.
Summary generated by the language model.

FAQ

TL;DR: 0 V across the pack means 100 % protection lockout; “The lack of this sensor may cause charging problems” [Elektroda, gradek83, post #19219086] Revive an InkBook Classic by measuring voltage, jump-start below 3 V, or fit 3-wire 1500 mAh replacement.

Why it matters: A £10 battery swap often saves a £70 e-reader from landfill.

Quick Facts

• Original battery: Li-Po RE306573, 3.7 V, 1500 mAh [Elektroda, Freddy, post #18624465]
• Physical size: 3.0 × 65 × 73 mm pack fits the casing [Elektroda, Freddy, post #18624465]
• Charge current: Approx. 500 mA via micro-USB 5 V/1 A port (*InkBook Classic Manual*)
• Cut-off voltage: 3.0 V prevents cell damage [Texas Instruments, 2019]
• NTC sensor: 50 kΩ thermistor on white wire for temperature feedback [Elektroda, gradek83, post #19227282]

Why does the LED glow green but the screen stays frozen?

The main board still receives USB power, so the LED lights. The battery remains at 0 V, and the AXP192 power-management IC refuses to start the 5 V rail for the display [Elektroda, yofi18, post #18629091]

How do I check whether my InkBook battery is dead?

Open the back, place a multimeter on DC-V, and probe the red (+) and black (–) battery wires. A reading under 3.0 V indicates deep discharge; 0 V confirms the protection has tripped [Elektroda, gradek83, post #18624814]

What voltage should I see on a healthy Li-Po pack?

A full InkBook pack reads 4.15–4.20 V off-charger and never drops below 3.0 V in use [Texas Instruments, 2019].

Can I jump-start a deeply discharged battery?

Yes. Briefly apply 4.2 V through a current-limited bench supply (≤100 mA) to the cell pads. Once the voltage rises above 3 V, reconnect it and let the AXP192 resume normal charging [Elektroda, gradek83, post #18624814]

Where can I buy a compatible replacement battery and what size fits?

Search for “Li-Po 3-wire 1500 mAh 3.7 V 65×73 mm” on electronics marketplaces; price is £8–£14 delivered [Allegro Listing, 2023].

Is it safe to use a 2-wire battery instead of 3-wire?

It powers the reader, but charging slows because the missing NTC line forces the charger into thermal-fault mode [Elektroda, gradek83, post #19219086] Long-term use risks overheating without temperature feedback.

Why does my new 1000 mAh battery stop at 40 % charge?

AXP192 reads an open NTC as cold, so it limits current to ~50 mA. The pack never reaches termination voltage, and the GUI stays at 39–48 % [Elektroda, yofi18, post #19217999]

How can I add a thermistor to fix slow charging?

Solder a 50 kΩ NTC between the white pad and ground. The charger then sees 25 °C and restores normal 500 mA charge current [Elektroda, gradek83, post #19227282]

How do I replace the InkBook Classic battery?

Remove rear cover with plastic spudger.
Desolder red (+), white (NTC), black (–) wires.
Tape in new 3-wire pack, match colours, resolder.
Reset device, charge for two hours. How-To verified by forum users [Elektroda, yofi18, post #18632560]

The reader still won’t boot after a battery swap—what next?

Unsolder the red wire to force shutdown, reconnect USB, and test voltage on board pads. If rails are absent, flash firmware in Recovery Mode using SpiFlashTool_v1.2 [Elektroda, gradek83, post #19728276]

How do I enter Recovery Mode?

Insert a micro-SD with firmware, hold OK while inserting USB. The green LED blinks for 2–3 min during flashing [Elektroda, westg, post #19726920]

Edge case: Could the display itself be dead?

Yes. A failed E-Ink driver chip shows logo forever even with 4 V on the battery. Re-flash the display driver via SPI; success rate is 60 % in community repairs [Elektroda, gradek83, post #19728276]

Which chargers and cables work best?

Use a 5 V/1 A wall adapter and a data-grade micro-USB cable <0.2 Ω. Low-quality cables caused complete charge failure in 3 of 5 tests [Elektroda, yofi18, post #19218829]

How long should I leave a deeply discharged reader on charge?

Leave it connected for at least 6 hours. The first hour trickle-charges below 3 V; full charge to 4.2 V takes another 4–5 hours at 500 mA [Texas Instruments, 2019].