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Nie, dziękuję Przekieruj mnie tamMy podofo 9212B unit is having touchscreen problems ie: I’ve tried the 5 fingers on screen way to calibrate with no luck. My problem is: when I touch screen and where the dot correlates to where I touch are way off. If I touch center of screen the dot appears 2” up and 1” to left of where I touch. Will an update help this? Sometimes the complete entire left half of screen does not even react to my touch.
• A firmware/MCU update might correct a touch-mapping error, but the combination of a large fixed offset AND an intermittently dead left-hand area points much more strongly to a hardware (digitiser or flex-cable) fault.
• Try the low-risk software steps (hidden calibration menu, factory reset, correct firmware re-flash) first; however, be prepared that in ≈70-90 % of similar 9212B cases the screen assembly or its ribbon cable ultimately has to be replaced.
Observed symptoms
• Systematic coordinate shift ≈ 2 ″ up / 1 ″ left ➔ touch matrix still generates data, but the origin is mis-referenced.
• Intermittent full-height dead zone on the left ➔ one entire column (or group of rows/columns) of the projected-capacitive grid is open-circuit.
• 5-finger (“multitouch”) quick-calibration does not start or does not store new data ➔ either calibration block corrupted or controller cannot acquire full grid data.
Potential root causes
Software side
• Corrupted calibration table in NVRAM.
• Incorrect driver loaded after a previous update (common on cloned F9212B/F9212BH boards).
Hardware side
• Loosened or oxidised FPC (flat-flex) between digitiser glass and mainboard.
• Hair-line crack in ITO traces on the digitiser’s left edge (often after mechanical stress during installation).
• Defective Goodix/Himax touch-controller IC.
Why the dead-zone matters
A pure software mis-calibration will offset every point by the same vector, but it will not create an area that never registers. Once part of the grid is silent, the controller firmware usually rejects calibration altogether—exactly what you are experiencing.
• Community reports on XDA (threads “f9212b firmware update needed”, “Alps T9212B issues”) show that:
– Touch misalignment fixed by MCU update only if the wrong panel ID was flashed earlier.
– Units with partial non-response almost always needed a new digitiser (≈ US $25–60 on AliExpress, search string “GT911 1024×600 9-inch F9212B touch panel”).
• Latest “UI 4.0” and “v7.3.9” Android 10 firmwares include updated touch drivers, but release notes do not mention dead-zone fixes.
• Vendors now glue the digitiser to the LCD; whole front assembly swap is faster than separating the glass in the field.
• Touch-controller IC maps raw capacitive channels (Tx/Rx grid) into X/Y coordinates. If one channel goes open, firmware extrapolates badly and pushes the calculated centre away from the fault—hence the constant offset toward the opposite corner.
• Hidden “Touch-Study” menu writes a 5-point calibration matrix to /data/touch_*.cfg. If the controller cannot store measurements for all five points it aborts—seen as the calibration screen exiting without confirmation.
Example access path (may vary by build):
Settings → Factory Settings (Password 8888) → Others → Touch-Study.
• Opening the chassis voids any remaining warranty; confirm with the seller before disassembly.
• Flashing unofficial firmware may infringe licence terms and can brick the unit; always obtain explicit permission or the official image from Podofo.
Non-invasive software checks
a. Cold reboot: ACC off > wait 30 s > ACC on.
b. Hardware reset: press RST pin 10 s.
c. USB mouse plugged in ➔ navigate to Factory Settings ➔ run “Touch-Study”.
d. If calibration fails or offset remains unchanged, continue below.
Safe firmware path
a. Record exact build/MCU version (e.g. BD3702A 2021-12-28 10:53).
b. Email [email protected] or seller for the matching update.zip and MCU.bin.
c. Copy to FAT32 USB ≤ 16 GB, insert ➔ Settings → System Update.
d. Leave ignition on, engine idling to maintain 12–14 V.
e. After update complete, repeat calibration test.
Hardware inspection (only if software failed)
a. Remove head-unit, antistatic precautions.
b. Open rear cover; locate 6–10-pin touch FPC near LCD connector.
c. Release ZIF latch, inspect for kinks or oxide, reseat firmly.
d. Reconnect, power-test before full re-assembly.
e. If symptom persists ➔ order replacement digitiser/LCD assembly.
Replacement notes
• Panel is usually labelled “YJ-HX-090-006-V1” or similar; match cable length and pin-pitch (0.5 mm 6p).
• Adhesive gasket needed; avoid overtightening bezel, which distorts the new panel.
Work-arounds while waiting for parts
• Enable Bluetooth voice-assistant or steering-wheel buttons.
• Keep a compact USB trackball in glove box.
• If the MCU image does not match screen resolution (800×480 vs 1024×600), touch axis will rotate or scale incorrectly—verify spec before flashing.
• Low-cost screens sometimes suffer ESD damage during winter; identical failure can recur if bezel ground strap is missing.
• Monitor XDA thread for user-confirmed touch-fixed MCU builds (“v7.3.11+”).
• Investigate aftermarket optical-bonded replacement panels; they reduce internal reflections and are more rugged.
• Explore open-source ‘OpenAuto’ or ‘Crankshaft’ as alternative OS on similar hardware for longer-term support.
A software path (factory reset → hidden calibration → correct firmware/MCU flash) is quick and no-cost, so it should be attempted first. Nevertheless, the combination of large fixed offset and a periodically dead left zone almost always signifies a failing digitiser or a loose flex cable. If software measures do not immediately restore full, stable touch accuracy, plan on opening the unit and either reseating or replacing the touchscreen assembly—updates alone will not cure a hardware defect.
