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-   -   JVC LT-40C860 stuck on logo (https://www.badcaps.net/forum/showthread.php?t=97972)

ioanban 08-09-2021 06:17 AM

JVC LT-40C860 stuck on logo
 
4 Attachment(s)
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,

dick_barton 08-09-2021 07:39 AM

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

ioanban 08-09-2021 08:44 AM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by dick_barton (Post 1063540)
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

ioanban 08-09-2021 09:45 AM

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.

vinceroger69 08-09-2021 09:54 AM

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

dick_barton 08-09-2021 11:31 AM

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.

ioanban 08-09-2021 02:39 PM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by dick_barton (Post 1063582)
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

angelos 08-10-2021 04:08 AM

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.

ioanban 08-12-2021 05:50 AM

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. :(

arizanotlari 08-12-2021 06:16 AM

Re: JVC LT-40C860 stuck on logo
 
try this : https://yadi.sk/d/_zlpfQXu5tD28w

dick_barton 08-12-2021 06:33 AM

Re: JVC LT-40C860 stuck on logo
 
The EEPROM reader/writer is dead cheap and worth having in your tool box.

ioanban 08-13-2021 06:44 AM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by arizanotlari (Post 1064173)

Hi,
I have tried with this file but nothing happens, doesn't start updating

ioanban 08-13-2021 06:45 AM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by dick_barton (Post 1064180)
The EEPROM reader/writer is dead cheap and worth having in your tool box.

I have just ordered an EEPROM reader/writer . Thank you

ioanban 08-20-2021 03:45 AM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by ioanban (Post 1064370)
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,

dick_barton 08-20-2021 04:17 AM

Re: JVC LT-40C860 stuck on logo
 
2 Attachment(s)
Which EEPROM reader/writer did you buy?
If it was the CH341A then here are a few progs that should work.

lotas 08-20-2021 04:55 AM

Re: JVC LT-40C860 stuck on logo
 
1 Attachment(s)
Here is another program for CH341A.

ioanban 08-26-2021 07:45 AM

Re: JVC LT-40C860 stuck on logo
 
Quote:

Originally Posted by dick_barton (Post 1065760)
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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