Re: Sony KD-55XF8505 won‘t start
Unfortunately, the firmware for the board cannot be found on the internet. I've searched on Russian sites myself. but they seem to have installed other mainboards
TobiasG
Member
Last Activity: 02-21-2023, 07:30 AM
Joined: 09-10-2022
Location: Falkenstein/Vogtl.
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Re: Sony KD-55XF8505 won‘t start
With the new mainboard everything works fine.
Maybe I will try later, if it is possilbe to read the emmc from the new one and write it to the old. Maybe it works with less deep engagement...Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
Do you think that the chip is defective or the data it contains, or could reflowing help?Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
And what does that mean for me now?
Is it probably the eMMC?Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
The working board for my TV (with the same part number) should arrive tomorrow. Then I'll also try the the dumping of the eeproms and reflashing the dumps to my old board, since it might lead to me saving money because I can then send the new board back.
Anything else would be stupid, or
I also considered checking all the electronic parts again with the values i will messure at the new board and maybe I'll still find the error on my old board.
But if it still doesn't work, what else could it be?...Last edited by TobiasG; 09-13-2022, 06:11 AM.Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
Unfortunately, I've tried that before, but without success...Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
I also assume that the fault is not there, since the TV shows no reaction at all. Or did I misunderstand you?
For me as a layman it really sounds more like the bootloader. And is that also correct, if something doesn't fit there, the CN6401-8 (BL_ERR) just doesn't deliver 0V but like at my point 2.3V...Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
Briefly summarized:
So we all assume that the motherboard is defective and nothing else, right?
I have already ordered a used, tested mainboard (which I could send back, if i could find the problem with mine).
If it's the eMMC, then I can't get any further without a dump and programmer anyway, and unfortunately I couldn't find anything here in the forum or on google.
And I could still do that with the eeproms, but I'm wondering if it's worth the effort, since I almost don't assume that it's their fault?!...Last edited by TobiasG; 09-13-2022, 04:25 AM.Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
Yes IC2001 is the eMMC (Samsung KLMAG1JETD-B041).
But could it be, that the firmware is faulty?
And if so, how could I test or fix this?...Last edited by TobiasG; 09-13-2022, 03:57 AM.Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
Stupid question:
What is the dumping and re-rewriting with the same dump supposed to do? If the chip is defective or no longer holds the correct data, then nothing changes with a new flashing of it, right?
And PiQ maybe stands for:
[URL="https://en.wikipedia.org/wiki/Prefetch_input_queue"]Prefetch Input Queue[/URL]Re: Sony KD-55XF8505 won‘t start
Stupid question:
What is the dumping and re-rewriting with the same dump supposed to do? If the chip is defective...Last edited by TobiasG; 09-13-2022, 03:56 AM.Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
I tested the fuses and none seems to be faulty.
In the picture I highlighted every tested fuse...Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
IC4001:
Sony CXD4760GG
S7NC5S2
1826
Under the board there isnt anything.
And no, I think there only this 2 winbond 25Q16 chips with the flash memory...Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
No there isnt any called PICxxxxxx :/
I attached some pictures.
And yes i own an EPROM programmer...Last edited by TobiasG; 09-13-2022, 12:55 AM.Leave a comment:
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Re: Sony KD-55XF8505 won‘t start
When I plug in the TV, everything stays black, the status LED also stays off.
PFC: 390V
CN6801-2-3-4-5: 75V
CN6401-5 (STBY3.3V): 3.5V
CN6401-8 (BL_ERR): 2.3V
CN6401-13 (REG12V): 12.7V
CN6401-25 (TCON_VCC12V): 0V
At the Mainboard (for example at the ICs at the top) there is 3.5V present and also at the wifi board.
When I try to turn on the TV with the power button or with the remote control, nothing changes.
Next I checked following:
CN6401-7...Last edited by TobiasG; 09-12-2022, 11:16 PM.Leave a comment:
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Sony KD-55XF8505 won‘t start
Does anyone have the service manuel for the KD-55XF8505?
I've already tested a few things and apparently the mainboard is defective and I don't have the exact instructions on how to find out what's defective.
PSU and T-Con seems to work. -
Re: Sony KD-55X8505 not able to start
Does anyone have the service manuel for the KD-55XF8505?
I have the same problem but i couldnt make a new postLeave a comment:
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