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LG 42LB650V - Boot Logo Hang Issue: Main LC / LD LE42B, 42G EAX65384004, EBT63439306 Help

naprawa tv 29805 16
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How can I fix an LG 42LB650V that stays on the startup logo and does not boot?

Replace or reprogram IC103 (the EEPROM/EMCC) with a blank or new chip, then perform a reset; this is the main fix suggested for the logo-hang fault [#17388910][#17853484] If the memory is still readable, it is likely not completely damaged, so you can clone it several times and compare the reads, then program the contents from a working donor board [#17402599] If writing the chip is unreliable or the problem returns, use a new preprogrammed EMCC/EEPROM instead [#17402884][#17404698]
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  • #1 17388739
    naprawa tv
    Level 18  
    Posts: 503
    Help: 2
    Rate: 40
    Hello, as in the subject of tv, there is only the startup logo.
    Main LC / LD LE42B, 42G EAX65384004 (1.5) EBT63439306.
    Has anyone grasped this topic, or just a disc replacement. I would ask for help.
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  • #2 17388910
    jean0791
    Level 23  
    Posts: 296
    Help: 75
    Rate: 229
    Replace EEPROM IC103 with blank memory chip then carry out a reset.
  • #3 17389577
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1626
    You can try to fix:

    LG 42LB650V - Boot Logo Hang Issue: Main LC / LD LE42B, 42G EAX65384004, EBT63439306 Help
  • #4 17390087
    Adewag
    Level 21  
    Posts: 1080
    Help: 36
    Rate: 249
    GanCegall wrote:
    You can try to fix:


    I confirm:


    LG 42LB650V - Boot Logo Hang Issue: Main LC / LD LE42B, 42G EAX65384004, EBT63439306 Help
  • #5 17400011
    rob1
    Level 25  
    Posts: 1109
    Help: 68
    Rate: 139
    Unless the EMCC is damaged, it can be repaired this way, of course you need the correct EMCC charge
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  • #6 17402393
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1626
    Well, what's up, buddy @ repair tv ?
    A week has passed, he received a few hints, used it?
    How to repair described? :-)

    Added after 3 [minutes]:

    rob1 wrote:
    Unless the EMCC is damaged

    The author of the topic is not active, so let's discuss.
    Is there any way to check this?
  • #7 17402599
    Adewag
    Level 21  
    Posts: 1080
    Help: 36
    Rate: 249
    If the memory can be read, it should not be damaged. To be sure, this can be done several times and compared. Then program the batch from a working donor and test if there are no problems with HDCP keys, internet, CAM module, etc.
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  • #8 17402884
    rob1
    Level 25  
    Posts: 1109
    Help: 68
    Rate: 139
    The memory is readable, but it may not be writable, preferably a new one that has already been programmed and the problem will not return.
  • #9 17404605
    Adewag
    Level 21  
    Posts: 1080
    Help: 36
    Rate: 249
    rob1 wrote:
    The memory is readable, but it may not be writable, preferably a new one that has already been programmed and the problem will not return.


    1) Why not give it a try, maybe it's still possible to save
    2) Where to get the programmed?
    3) Who would like to upload an incorrect batch?
    4) Maybe a new TV set right away? :wink:
  • #10 17404698
    rob1
    Level 25  
    Posts: 1109
    Help: 68
    Rate: 139
    1 You can try, the TV gets up after that but not all
    2 Program a new EMCC in the programmer (unless there is a problem with the lack of a programmer, adapters for programming the memory and new EMCC memory, this EMCC type occurs in many other TV models, so it is worth having them in stock)
    3 If it is correctly matched with a working TV, no problem
    4 You can buy new best 4K and EMCC memories on board :D .
  • #11 17439378
    Potek11
    Level 7  
    Posts: 17
    Rate: 1
    Is it impossible to block reading this memory on startup so that the system would even start? I read somewhere about applying the Vcc signal or ground to the SDA bus.
  • #12 17439474
    rob1
    Level 25  
    Posts: 1109
    Help: 68
    Rate: 139
    Think about what you are writing.
  • #13 17439620
    mailo
    Level 27  
    Posts: 1315
    Help: 82
    Rate: 338
    Potek11 wrote:
    Is it impossible to block reading this memory on startup so that the system would even start? I read somewhere about applying the Vcc signal or ground to the SDA bus.


    Pretty good idea, you have to try it out!
  • #14 17843739
    almou
    Level 14  
    Posts: 116
    Rate: 54
    I erase the eeprom ic103 with a programmer but it don't work

    Dodano po 6 [minuty]:

    Hi Adewag. You don't describe very well the VCC and the VCCQ
  • #15 17844302
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1626
    almou wrote:
    Hi Adewag. You don't describe very well the VCC and the VCCQ

    I think it's very well, what don't you understand?
    almou wrote:
    I erase the eeprom ic103 with a programmer but it don't work

    But what did you expect?
  • #16 17853473
    almou
    Level 14  
    Posts: 116
    Rate: 54
    It's Ok GanCegall. We don't need the VCCQ. And the problem with Eeprom is that, when I erase the IC, nothing changed
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  • #17 17853484
    rob1
    Level 25  
    Posts: 1109
    Help: 68
    Rate: 139
    You have the solution given in previous posts -EMCC
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Topic summary

✨ The discussion revolves around the LG 42LB650V television experiencing a boot logo hang issue. Users suggest various troubleshooting methods, including replacing the EEPROM IC103 with a blank memory chip and performing a reset. There are mentions of checking the EMCC (Embedded MultiMediaCard) for damage and programming it with a working donor's batch to avoid issues with HDCP keys and other functionalities. Some participants discuss the possibility of blocking memory reading at startup and the challenges faced when erasing the EEPROM without resolving the issue. Overall, the conversation highlights potential repair strategies and the importance of using correctly programmed components.
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FAQ

TL;DR: LG 42LB650V boot-logo hang: one test showed 0% improvement after erasing IC103; "We don't need the VCCQ." This FAQ compiles proven thread remedies for technicians tackling this fault. [Elektroda, almou, post #17853473]

Why it matters: It helps bench techs revive LG 42LB650V sets efficiently without defaulting to full board swaps.

Quick Facts

What causes an LG 42LB650V to hang on the boot logo?

Contributors point to corrupted EMCC (eMMC) content causing the boot hang. Reprogramming or replacing the EMCC resolves it in this case. [Elektroda, rob1, post #17853484]

How can I check if the EMCC/eMMC is damaged or just corrupted?

Try multiple reads. If all dumps match, the chip is likely not physically damaged. “If the memory can be read, it should not be damaged.” Then proceed to program and test. [Elektroda, Adewag, post #17402599]

Will erasing or replacing EEPROM IC103 fix the boot loop?

One suggested approach is to replace EEPROM IC103 with a blank and then perform a reset. This is often tried before deeper storage work. [Elektroda, jean0791, post #17388910]

I erased IC103 and nothing changed—what should I try next?

Move to the EMCC path. Program or replace the EMCC with a known-good image to resolve the boot hang. [Elektroda, rob1, post #17853484]

What’s the practical EMCC recovery procedure?

  1. Read the EMCC; back up if readable.
  2. Program a new EMCC using a compatible programmer and adapters with a matched image.
  3. Refit, boot-test, and proceed with functional checks. The TV may recover, though not all units do. [Elektroda, rob1, post #17404698]

Do I need VCCQ when working on this memory?

One contributor reported VCCQ was not needed in their attempt. Their EEPROM erase yielded no change, reinforcing the EMCC focus. [Elektroda, almou, post #17853473]

Can I block the EEPROM read at boot by forcing SDA to Vcc or GND?

Avoid this. Forcing I2C lines risks damage and is not a supported bypass here. It was discouraged in the discussion. [Elektroda, rob1, post #17439474]

Which tools do I need to program the EMCC/eMMC on this board?

Use an eMMC programmer and the proper adapters. Keep new EMCC chips in stock, as this type appears in many TVs. Prepare a matched image. [Elektroda, rob1, post #17404698]

Why can I read the EMCC but fail to write it?

Writes can fail while reads still work. “The memory is readable, but it may not be writable.” Replace with a preprogrammed new EMCC. [Elektroda, rob1, post #17402884]

What should I test after flashing a donor image?

Verify HDCP keys on HDMI, internet connectivity, and CAM module authorization. Confirm there are no service or pairing issues. [Elektroda, Adewag, post #17402599]

Has anyone confirmed the shared fix works?

Yes. At least 1 confirmation exists in the thread; another member wrote “I confirm” after applying the fix. [Elektroda, Adewag, post #17390087]

Can every unit be revived with EMCC programming?

Not all. One contributor noted, “the TV gets up after that but not all.” Plan for possible mainboard replacement. [Elektroda, rob1, post #17404698]

How do I source a programmed EMCC for this mainboard?

Program a new EMCC using your programmer. Obtain the needed adapters. Keep EMCC devices in stock since they fit many models. [Elektroda, rob1, post #17404698]

What is IC103 on this board?

IC103 refers to the mainboard’s EEPROM used in resets. One suggestion replaces it with a blank before system reset. [Elektroda, jean0791, post #17388910]
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