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  1. #11
    Junior Member
    Join Date
    May 2021
    Posts
    1
    U25 is maybe SS8014 LDO regulator, marking 4B40, according to datasheet is 2.80V.
    But when I apply this voltage from external power source, the CPU is getting really hot.
    I should buy another one working and do measurements.

  2. #12
    Junior Member
    Join Date
    Jul 2021
    Posts
    1
    Hello!
    I fixed the same media player some time ago.
    This device has no power input protection. If you connected more than 6 volts, the player dies ((

    After replacing the U25, you got a strong warming up of the processor and voltage regulator.

    You have made a mistake in identifying the U25 chip. This chip powers the processor core. And 3.5 volts is a strong overvoltage. The maximum voltage is 1.5 volts.

    Marking 4B407 is XC9235A14?MR 1.4v 600mA

    This chip is difficult to buy.
    I applied adjustable LM3671MF-ADJ with the replacement of the R212 resistor, for 1.4v output.
    Factory values: R212 0R and R213 30K.

    I will also give a list of chips that I could identify.

    U27__3VE0B__XC6221A152MR___1.5v__200mA
    U28__3VT0H__XC6221A252MR___2.5v__200mA
    U26____0B2__XC6210B332MR___3.3v__700mA
    U25__4B407__XC9235A14?MR___1.4v__600mA___CPU_CORE
    U24__4B80D__XC9235A18?MR___1.8v__600mA___DDR
    U16____0B2__XC6210B332MR___3.3v__700mA
    U??___0B9E__XC6210B40_______4.0v__700mA
    U??__3A269__XC6221A332______3.3v__200mA
    U??__3A903__XC6221A40_______4.0v__200mA
    U??___9BMH__XC6212A502MR___5.0v__
    Last edited by Kombat; 2021-07-26 at 04:27.

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