Hitachi 55" TV dead after 18 months (Vestel 17MB100)

[Davi.p]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

I'm sorry, some moments i have maybe a loss of concentration, reading again the first post, indeed the freeze technique is not the thing to do. Let's start to say that i don't trust the fate fault, this behaviours happens very often and are the manufacturers that intentionally bricks your device!
In this optic you can follow two main paths, one to complaint agaist Hitachi that you are sure the fault is by guilt of the upgrade software, until you are to the point of scream in their face, this is the best approach because morally right. The other is to study how the tv is bricked and this only by the serial log and trying to enter in the console..

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

In freezer is ok.

I nearly had frost bite when fitting the frozen board but it didn't make any difference.
There is 5V on the main on the LED connector so it must be an option to derive it from either 3.3V or 12V.
I am setting up a terminal to read the Tx output on the mini SCART today when I figure out which pin it is in the normal SCART socket on the end of the adapter lead.

[Davi.p]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

In freezer is ok.

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Hi, try this, freeze with a butane gas or compressed air upside down can the following chips on the mainboard for 2-3sec.: U18,U23,U27 (appearently one microcontroller, two spi flash), U31(emmc) and eventually U1, wait 5sec. then turn on tv... Bye...

Not so easy to do I don't have a freezer spray. Would it work putting the board in the freezer & dropping it to zero C?

Its better to change the mainboard only with the correct part number. A mainboard from a 43 or 48 might work or it might not work. I cannot give you an answer for this. You have to find out yourself if you wanna go along that way.

I am still hoping to fix the original board. I think the PSU is working & saw a cheap board for £13 that will verify the PSU state & give me a whole TV board that can drive an older TV via SCART or HDMI that can't tune the latest incarnation of digital channels with the addition of a PC supply. The final solution might be a £40 board if the problem is hardware but I want to investigate and learn more.

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Could I get an Hitachi 17MB100 main board for 48" or 43" and use my USB stick to upgrade it to 55"? The only difference in the screen type is the VES480QNDS-2D-N11 to VES550QNDS-2D-N11. Another query is I read the USB stick needs to be ext3 format not fat32 or others.
I tried to check out the power supplies and found there was no 5V STBY on the main board but following it back to the PSU board there are no components fitted. Should there be 5V on the main board perhaps derived from another rail or is it an option that isn't required on this model TV?

Its better to change the mainboard only with the correct part number. A mainboard from a 43 or 48 might work or it might not work. I cannot give you an answer for this. You have to find out yourself if you wanna go along that way.

[Davi.p]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Hi, try this, freeze with a butane gas or compressed air upside down can the following chips on the mainboard for 2-3sec.: U18,U23,U27 (appearently one microcontroller, two spi flash), U31(emmc) and eventually U1, wait 5sec. then turn on tv... Bye...

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Software needs to be changed if you use the board from toshiba

Could I get an Hitachi 17MB100 main board for 48" or 43" and use my USB stick to upgrade it to 55"? The only difference in the screen type is the VES480QNDS-2D-N11 to VES550QNDS-2D-N11. Another query is I read the USB stick needs to be ext3 format not fat32 or others.
I tried to check out the power supplies and found there was no 5V STBY on the main board but following it back to the PSU board there are no components fitted. Should there be 5V on the main board perhaps derived from another rail or is it an option that isn't required on this model TV?

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Software needs to be changed if you use the board from toshiba.

Check here https://www.ebay.co.uk/sch/i.html?&_nkw=23348885

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

They look the same but the screen is different. The image might be ok or it might be flipped, solarized. Probably even the remote might be different. You might need to flash the firmware from Hitachi again but you need a toshiba remote control to flash it.

Are you saying the hardware could be different or it is software that can be changed? I bought mum a 65" Toshiba replacement because TV is her life at 96 years old so have a remote type CT8533.

There are few listings for your board on ebay...

I can't see any boards like mine only ones that appear to have the same components with a different reference.

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Did you buy it using a credit card? Some credit cards will double the factory warranty if purchased through them.

Yes maybe but it failed over 9 months ago and I was so disgusted with it I put it out of sight to stop me from smashing it up.

[Spitz]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Our TV is 55HK6T64U and had a 1 year warranty that is why they said buy a new one when the USB stick didn't fix it. Can you point me to a circuit diagram of the PSU that I can replace parts on if it is faulty and any information on the Vestel CPU board? I found a manual that appears to cover a lot of boards but it jumps from 95 to 130 with no mention of my 100 board that seems to be an oddball.

Did you buy it using a credit card? Some credit cards will double the factory warranty if purchased through them.

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

If a board is 17MB100 and it looks the same as mine can I use my Hitachi USB and change it for my TV?
My Main Board 23348885
New Main Board 23306084

They look the same but the screen is different. The image might be ok or it might be flipped, solarized.You never gonna know until you try.

Probably even the remote might be different. You might need to flash the firmware from Hitachi again but you need a toshiba remote control to flash it.

There are few listings for your board on ebay...

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

get a board and then update the firmware sent from hitachi.

If a board is 17MB100 and it looks the same as mine can I use my Hitachi USB and change it for my TV?
My Main Board 23348885
New Main Board 23306084

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

It must be a faulty mainboard not a faulty PSU.

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Service manual hitachi 55hk6t64u

Thanks a lot I have a chance of finding where the fault is now. I will report my findings and solution if one is available.

[lotas]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Service manual hitachi 55hk6t64u

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Your best bet is to get it fixing under warranty but I guess your warranty is voided becouse you already opened the back, but you can give hitachi a call and ask them.

Our TV is 55HK6T64U and had a 1 year warranty that is why they said buy a new one when the USB stick didn't fix it. Can you point me to a circuit diagram of the PSU that I can replace parts on if it is faulty and any information on the Vestel CPU board? I found a manual that appears to cover a lot of boards but it jumps from 95 to 130 with no mention of my 100 board that seems to be an oddball.

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

Probably a mainboard (firmware) related issue that can't be solved using the usb so you might need further help from a technician. You might need to reprogram or replace the emmc, but you never know, its not that easy diagnosing through a forum.So I don't know about faint hissing but I think its constantly trying to start up the mainboard.Your best bet is to get it fixing under warranty but I guess your warranty is voided becouse you already opened the back, but you can give hitachi a call and ask them.
Your tv model maybe 55HK6T64U or 55HGW69; so I checked for a mainboard replacement but I might need more info to get you the correct replacement, otherwise get a board and then update the firmware sent from hitachi.

[Ruptor]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

I thought Hitachi sent you the files and not the usb stick. Try holding ok for a bit longer or keep pressing ok button repeatedly.

I held the OK button & the button on the back of the TV for 2.5 minutes but no change. I just found a 2 GB SD card I can use but won't bother given your last post. Pressing the button lots of time made no difference either.
What about the faint hissing and ticking coming from the PSU does that point to any thing? In this LED flashing mode should the PSU be fully on?

[ducky29]

Re: Hitachi 55" TV dead after 18 months (Vestel 17MB100)

I can try and fudge a smaller capacity SD card in a USB adapter but why would Hitachi send me a USB stick that wouldn't work because it is too big for their TV?

My bad, I thought Hitachi sent you the files and not the usb stick. Try holding ok for a bit longer or keep pressing ok button repeatedly.

If it dosen't take firmware then it might be a hardware problem or a problem that can't be solved just with a usb stick.