d) Checkwhetherthekeyshaveascansignal.
3. LEDDisplayError
1) CheckwhethertheconnectionlineandsocketbetweenthesmallboardwheretheLEDisandthemain
boardarenormal.
2) Check whether the power supply and grounding of the small board where the LED is locat ed are
normal.
3) CheckwhethertheLEDcircuitisweldednormallyand
whetherthedeviceisdamagedbyfalsewelding.
4) ChecktheLEDforscanningsignal.
4. OLEDDisplayError
1) Check whether the connection line and socket between the OLED panel and the motherboard are
normal.
2) CheckwhetherthepowersupplyandgroundingoftheOLEDpanelisnormal.
3) Check whether the OLED backlightboostercircuit works normally and whether the output voltage of
12Visnormal.
4)
TryreplacinganOLED.
5) Ifalltheabovearenormal,A1chipmaybedamagedorSPIFLASHproblem.Tryitafterreplacement.
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