Vizio a320-a0 eeprom

[RDC55]

Hi everyone,

I was trying to repair this Vizio 32 inch and have isolated it to the EEPROM. The symptoms are it does not respond to the power button and so no backlights or any indication that the button was even pressed. Applying freeze spray to the EEPROM while the set is unplugged, and then plugging it in and all is well.

Now I know I can buy pre-programmed EEPROMS for $15.00 or so, but I wanted to do this myself. So, the original EEPROM is Winbond 25Q64FSIG. I ordered this but received a 25Q64JSIG, which has slightly different timing characteristics. Well, being hopeful I tried programming the J version, installed it, and the TV does not boot. You can see with a scope that data is being accessed but what the data is who knows.

As the source code I used the original EEPROM. After desoldering it I was able to read and verify it. The next day I tried reading the original one again and it was not responding, so just to be redundant I hit it with freeze spray and verified it matched the code I had pulled the day before.

So, just wondering what substitutes others may have used for the Winbond 25Q64FSIG and had success since I can't locate that one other than China.

I did find this document that has a comparison, and it looks like the Cypress is available at Mouser, but not sure if I will have the same issue.

Puzzling and annoying website issue - why does capitalization in the title revert to not capitalized. I entered VIZIO A320-A0?

[Diah]

Re: Vizio a320-a0 eeprom

in computer design if you are going to install memory card with different / high Freq. you need to adjust jumper table on PC mainboards. .. at TV design the freq are fixed. yours F are 104MHz the J are 133MHz.

[RDC55]

Re: Vizio a320-a0 eeprom

in computer design if you are going to install memory card with different / high Freq. you need to adjust jumper table on PC mainboards. .. at TV design the freq are fixed. yours F are 104MHz the J are 133MHz.

Well yes, the J version has a maximum specification of 133 MHz excepting read data, which is still 104 MHz max, but note that is the maximum operating frequency for the device.

The board is not running anywhere near that as the local crystal is clocking 27 MHz. I think there are other parameters that are causing an issue and it would be nice to know just what the issue is so thanks for offering an opinion. However, the main question is looking for a compatible substitute EEPROM available somewhere within the USA and not China?

[Diah]

Re: Vizio a320-a0 eeprom

The board is not running anywhere near that as the local crystal is clocking 27 MHz. the main question is looking for a compatible substitute EEPROM available somewhere within the USA and not China?

i gave PC example to narrow the subject. the crystal 27Mhz had nothing to do in this case ... you can find it at any audio video device..

the first Freq generated at PSU. mainboards component should response to this Freq and sent signal back at same range... freq explanation you wrote are not in place at all. yours set old design with limited Freq. only the F will response.. BTW all made in china. over many years i dont have any problem as i do have trusted seller where i buy from.

[RDC55]

Re: Vizio a320-a0 eeprom

i gave PC example to narrow the subject. the crystal 27Mhz had nothing to do in this case ... you can find it at any audio video device..

the first Freq generated at PSU. mainboards component should response to this Freq and sent signal back at same range... freq explanation you wrote are not in place at all. yours set old design with limited Freq. only the F will response.. BTW all made in china. over many years i dont have any problem as i do have trusted seller where i buy from.

It's not the issue of being made in China, it is the lead time for us here in the states, which is about 30 days or sometimes longer. There are some Ebay options, but I am also not interested in paying 10X the cost of an equivalent new part from Mouser or Digikey. I have learned patience is key in repairing some of these sets to keep the cost below the actual value of a working set, and even though anything I repair is donated to charity I would prefer not to spend more than is necessary.

That is some wild logic on that EEPROM clock speed and its functionality.

"the first Freq generated at PSU. mainboards component should response to this Freq and sent signal back at same range..."

If anyone believes the Power Supply PWM or PFC controller frequencies have anything to do with the EEPROM functioning they need to do some reading to educate themselves, or maybe it's just a communication issue?

[Diah]

Re: Vizio a320-a0 eeprom

Read and learn more about DC to DC MOSFET switching frequency calculation.

[budm]

Re: Vizio a320-a0 eeprom

It's not the issue of being made in China, it is the lead time for us here in the states, which is about 30 days or sometimes longer. There are some Ebay options, but I am also not interested in paying 10X the cost of an equivalent new part from Mouser or Digikey. I have learned patience is key in repairing some of these sets to keep the cost below the actual value of a working set, and even though anything I repair is donated to charity I would prefer not to spend more than is necessary.

That is some wild logic on that EEPROM clock speed and its functionality.

"the first Freq generated at PSU. mainboards component should response to this Freq and sent signal back at same range..."

If anyone believes the Power Supply PWM or PFC controller frequencies have anything to do with the EEPROM functioning they need to do some reading to educate themselves, or maybe it's just a communication issue?

Sorry but I have to laugh, just think about it, if the TV is using external AC-DC power supply to the input to the TV is just DC, how do you tap into switching frequency of that external power supply. The clock line for EEPROM has nothing to do with switching power supply frequency. Someone should learn how the EEPROM works and what it needs needs for it to work.
Now you see what I mean in my PM.
I design lots of products using EEPROM (some of the products have NO switching power supply, purely run on batteries), I show this to my other engineers and they had big laugh.

[Diah]

Re: Vizio a320-a0 eeprom

Sorry but I have to laugh, just think about it, if the TV is using external AC-DC power supply to the input to the TV is just DC, how do you tap into switching frequency of that external power supply. The clock line for EEPROM has nothing to do with switching power supply frequency. Someone should learn how the EEPROM works and what it needs needs for it to work.
Now you see what I mean in my PM.
I design lots of products using EEPROM, I show this to my other engineers and they had big laugh.

laughing on your wrong example. external DC will be fixed the regulator on mainboards will deal with frequency.. PSU on boards different story.

POST #6 belong to you too

[budm]

Re: Vizio a320-a0 eeprom

LOL! Like I said, I design board that has EEPROM and no switching power supply period. My co engineers are still laughing!

[budm]

Re: Vizio a320-a0 eeprom

BTW, my post # 7 is between I and OP, so butt out.
I hole TOPCAT is reading this.

[Diah]

Re: Vizio a320-a0 eeprom

LOL! Like I said, I design board that has EEPROM and no switching power supply period. My co engineers are still laughing!

i do respect you as any other members.. but to me you are with more fantasy had. can you tell please which threat over here or any over all internet you where posted on any programing language of SPI solution or the communication to any I2C ports which all TV are fluted with.

if my know how make other nervous,, so calm all i am not attend to be super user.. i just from bone cant silent of wrong statement.

[budm]

Re: Vizio a320-a0 eeprom

Keep it up. Like I said, it is between I and OP, not you so butt out. You can keep on quoting me, I did not.

[budm]

Re: Vizio a320-a0 eeprom

LOL! KEEP IT UP.
"if my know how make other nervous,, so calm all i am not attend to be super user.. i just from bone cant silent of wrong statement."

Like this statement in this thread?
https://www.badcaps.net/forum/showth...t=94579&page=3

"TV BL LEDs function with currents not Volts, so it must be each LED contained 1 ziner diode.

Normal LED for lighting application include RGB one they dont need ziner as they calculated of LEDs amounts and volts.

who are against this fact bring proof you have TV BL with out ziner."

Then I show piles of LED backlights WITH AND WITHOUT ESD ZENER PROTECTION in post #74.

RDC55 post #57 "@budm is quite the reliable source of information on this site, and in this thread he comments that not all LED's have the zener."

DIAH post #63:
"at the end, this zener not only protection.. its the hearts of the LED. if there no circuit will be blind nothings go on. also NO NO TV with LED backlight will work with out units build in zener. any one write some TV or not all he is wrong. " LOL!

RGB LED with ESD zener to protect Blue and Green LED's: nothing to do with calculation.
https://cdn.badcaps-static.com/pdfs/...909c23fdee.pdf

[RDC55]

Re: Vizio a320-a0 eeprom

OK, so back on subject with no drama.

It turns out the 25Q64JSIG will work fine as a replacement for the 25Q64FSIG, and the real issue I had was a corrupt .bin file.

I had copied the original file from the EEPROM that exhibited the issue of TV would not turn on, but I could freeze the EEPROM and all was well. After removing the EEPROM it was a bit weird as I could read it without freezing it, so I saved that file. The next day I was going to do another verify but could not read the EEPROM. So out with the freeze spray and once again I could read it and it verified against the file I saved the day before. So I felt confident and I loaded that file into the 25Q64JSIG EEPROM. The result, the TV did not power on - no backlights, nothing.

Well, I got a new copy of the file and did an eyeball comparison just looking at length. The new file had data up to hex address 006F83B0, and the file I saved earlier had data up to address 006F6310, so there was a difference. The new to old obviously wouldn't verify, but I was a bit surprised when it failed immediately.

So, the new file programmed into the 25Q64JSIG EEPROM and working fine.

[budm]

Re: Vizio a320-a0 eeprom

Great work work due to common sense and using logic (very rare these days) to solve the problem, may be you should upload the file so other people can use it too, I believe that there is a thread for the EEPROM dump file.

[RDC55]

Re: Vizio a320-a0 eeprom

Great work work due to common sense and using logic (very rare these days) to solve the problem, may be you should upload the file so other people can use it too, I believe that there is a thread for the EEPROM dump file.

Thanks budm. I will post the file in the EEPROM thread as that is a nice resource. The only problem I have is it is lengthy thread so finding the file you want is a chore. I tried to enter key words, but google search engine doesn't seem to find it. I also wanted to check a couple of other things before doing so.

The original working file that I had copied contained channel and user information, so I wanted to compare to a factory reset file. It was interesting that the file size and length did not change between the two. I don't have a program to compare files, but it would be interesting to see just what changes between the two.

And, what would really be nice is a way to read the data on the board rather than having to remove the EEPROM. This must be a doable thing but I suppose it could take special software. The same would go for extracting NAND data for some of these main boards.