ETS668
11. Troubleshooting Guide
Huawei Technologies Co., Ltd.
ETS668
11. Troubleshooting Guide
11.1. Troubleshooting of LOGIC Block
In case of Booting Reset(repeat)
11.1.1. In Case of Power ON |
>> PAM(U202 #5(Short checking)>> change |
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Press the button PWR.
Yes
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Can the power be conducted to #1 of U505, #4 of U506?
You should check and repair No the line from BATT. power via
D500 and Q500 to Q501.
Yes
Can 2.7V, 3V be conducted to VDD U400?
You should check and repair No the related and surrounded
circuit for U505, U506.
Yes
Can it be conducted more than |
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No |
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You should check and repair |
3.4V to #1 for U505 and #4 for U506? |
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the U505, U506 surrounded circuit. |
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Yes
End
Huawei Technologies Co., Ltd.
ETS668
11.1.2. Initial operating failure
Press the button PWR. |
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Yes |
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Can it be generated the RAM_CS1_N |
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You should check the |
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signal for U400 #P14 and the ROM_CS1_N |
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No |
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output for CLK from U301 #4 |
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signal for U400 #R15? |
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with 19.2MHz |
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Yes |
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Can it be inputted for TCXO to |
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You should check |
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No |
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repair the output TCXO |
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U150 #36? |
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from F300 #3 and C310. |
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Yes |
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Can it be outputted for CHIPX8 to |
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You should check |
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No |
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U400 #A14? |
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re-download S/W |
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Yes |
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You should check |
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Can it be on for LED D517? |
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No |
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repair the related and LED. |
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Yes |
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Can it be showed the initial screen |
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You should check |
and |
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No |
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on LCD panel normally? |
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repair the related and LCD. |
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Yes
End
Huawei Technologies Co., Ltd.