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Old 08-09-2021, 06:17 AM   #1
ioanban
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Default JVC LT-40C860 stuck on logo

Hi guys,
I have a JVC LT-40C860 stuck on logo.
I have tried all sorts of resets but nothing seems to help.
I have checked the fuses on the main board and power supply and capacitors everything seems ok.

From what i was reading on the forum I tend to believe it's a firmware problem.

Now the question, is anyone who can give me the firmware so that i can put it on a usb drive and see if it solves my problem ?

Tried contacting JVC but i got no reply.

I've attached some pictures with the boards in case anyone wants any extra info.
Thank you,
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Old 08-09-2021, 07:39 AM   #2
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Default Re: JVC LT-40C860 stuck on logo

Is U13 an MX25L512 EEPROM or equivalent. If so I would freeze it with freezer spray and make cerain it gets really cold (set powered off) and then attempt to reboot the TV. You may have a failing EEPROM
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Old 08-09-2021, 08:44 AM   #3
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Default Re: JVC LT-40C860 stuck on logo

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Originally Posted by dick_barton View Post
Is U13 an MX25L512 EEPROM or equivalent. If so I would freeze it with freezer spray and make cerain it gets really cold (set powered off) and then attempt to reboot the TV. You may have a failing EEPROM
It is KH25L1606E. I'm just going to buy a spray and I'll give it a go
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Old 08-09-2021, 09:45 AM   #4
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Default Re: JVC LT-40C860 stuck on logo

I have frozen the EEPROM and it went over the logo but got reseted in a few seconds.
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Old 08-09-2021, 09:54 AM   #5
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Default Re: JVC LT-40C860 stuck on logo

if you cant find a firmware dump this maybe be your board maybe worth sending the seller a lower price offer
https://www.ebay.co.uk/itm/234098833...EAAOSwpL5g-Jxy

Last edited by vinceroger69; 08-09-2021 at 09:58 AM..
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Old 08-09-2021, 11:31 AM   #6
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Default Re: JVC LT-40C860 stuck on logo

Try freezing it again and allow the EEPROM to get really cold. Give it several good blasts. Very often the inside of the IC hasn't become cold enough.
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Old 08-09-2021, 02:39 PM   #7
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Default Re: JVC LT-40C860 stuck on logo

Quote:
Originally Posted by dick_barton View Post
Try freezing it again and allow the EEPROM to get really cold. Give it several good blasts. Very often the inside of the IC hasn't become cold enough.
I'll try gain, thank you
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Old 08-10-2021, 04:08 AM   #8
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Default Re: JVC LT-40C860 stuck on logo

I saved a tv like that. I desoldered the chip off the board and fit it in my eprom reader. Then i sprayed it ice cold and started the read process. During the read i sprayed it again. I got a data image. Saved it, and dumped it into a new blank chip and viola. It worked , tv went out back to customer, fixed.
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Old 08-12-2021, 05:50 AM   #9
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Default Re: JVC LT-40C860 stuck on logo

Unfortunately the freezing didn't work for me and i don't think it's worth me buying a eeprom reader. I was looking for a firmware to use with an USB drive but no one seems to have one . I'm thinking on getting another main board.
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Old 08-12-2021, 06:16 AM   #10
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Default Re: JVC LT-40C860 stuck on logo

try this : https://yadi.sk/d/_zlpfQXu5tD28w
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Old 08-12-2021, 06:33 AM   #11
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Default Re: JVC LT-40C860 stuck on logo

The EEPROM reader/writer is dead cheap and worth having in your tool box.
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Old 08-13-2021, 06:44 AM   #12
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Default Re: JVC LT-40C860 stuck on logo

Quote:
Originally Posted by arizanotlari View Post
Hi,
I have tried with this file but nothing happens, doesn't start updating
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Old 08-13-2021, 06:45 AM   #13
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Default Re: JVC LT-40C860 stuck on logo

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Originally Posted by dick_barton View Post
The EEPROM reader/writer is dead cheap and worth having in your tool box.
I have just ordered an EEPROM reader/writer . Thank you
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Old 08-20-2021, 03:45 AM   #14
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Default Re: JVC LT-40C860 stuck on logo

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Originally Posted by ioanban View Post
I have just ordered an EEPROM reader/writer . Thank you
Hi guys,
I have ordered an eeprom reader/writer but i couldnt get a working driver to be able to access the info on the eeprom so I bought a replacement main board and got it in. Tv is working perfect now.

If any of you has a reliable software for win10 that i can use with the eeprom reader/writer please share'it with me !

Regards,
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Old 08-20-2021, 04:17 AM   #15
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Default Re: JVC LT-40C860 stuck on logo

Which EEPROM reader/writer did you buy?
If it was the CH341A then here are a few progs that should work.
Attached Files
File Type: zip AsProgrammer_V2.1.0.13_XiTongZhiJia.zip (1.98 MB, 16 views)
File Type: rar CH341A_1.30.rar (3.06 MB, 19 views)

Last edited by dick_barton; 08-20-2021 at 04:32 AM..
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Old 08-20-2021, 04:55 AM   #16
lotas
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Default Re: JVC LT-40C860 stuck on logo

Here is another program for CH341A.
Attached Files
File Type: rar SiberiaProg-CH341A_1,41.rar (8.28 MB, 46 views)

Last edited by lotas; 08-20-2021 at 05:06 AM..
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Old 08-26-2021, 07:45 AM   #17
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Default Re: JVC LT-40C860 stuck on logo

Quote:
Originally Posted by dick_barton View Post
Which EEPROM reader/writer did you buy?
If it was the CH341A then here are a few progs that should work.
I bought the CH341A.
I'll try the progs you've given me.
Thank you
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