Tricolor Indicator And Touch Key Backlight Circuits - Huawei Ascend Maintenance Manual

Y210 Mobile Phone
Maintenance Manual
Troubleshooting Key or Button Failure
Figure 9-21 Key or button failure

9.4.6 Tricolor Indicator and Touch Key Backlight Circuits

The Y210's battery charging indicator (tricolor indicator) provides red, green and blue light
sources that are driven by the PM8029's three LED driver.
Table 9-12 Light source and driver pins
Light Source
Red
Green
Blue
Figure 9-22 Status indicator circuit
Issue 1.0 (2012-11-28)
Key or button failure
Is the keypad on the
FPC in good contact
with the dome sheet?
Y
Are the FPC and ZIF
connector connected
properly?
Y
Return the phone
to the factory
Driver Pin (PM8029)
LED_RED_DRV_N (MPP3)
LED_GREEN_DRV_N (MPP5)
LED_BLUE_DRV_N (MPP8)
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9 Principles and Failure Analysis
N
Clean the
keypad and the
dome sheet
N
Re-connect them
Remarks
Adjusted using electric current
Adjusted using electric current
Adjusted using electric current
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