Samsung QN75Q60TAF Boot Loop fixed but no picture

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

its better if he upload very clear photo of the chip area to see pins 123 67 where to go to understand the porpoise of DT601 / 602 and most important pin 6 SCLK so will find way to block the clock

As requested...

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

did you order it with clip add ?? because clip much easy to use and good for future use

This is what i ordered;

https://www.amazon.ca/gp/product/B07...?ie=UTF8&psc=1

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

It is possible to put a clean spi flash (empty, FF FF ...) for the experiment, that in some models they are without data (empty), in other models they already come with data.

its better if he upload very clear photo of the chip area to see pins 123 67 where to go to understand the porpoise of DT601 / 602 and most important pin 6 SCLK so will find way to block the clock

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

It is possible to put a clean spi flash (empty, FF FF ...) for the experiment, that in some models they are without data (empty), in other models they already come with data.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

So the programmer will not start and will not be able to read the data if there is a short on Vcc 3.3v for spi.

exactly... if the programmer failed we will have the answer.

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

So the programmer will not start and will not be able to read the data if there is a short on Vcc 3.3v for spi.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

So, what is there to guess, just measure the resistance between 4 and 8 pin., if there is a low resistance, then spi flash into the trash.

of course not. this just belong to this threat and his issue.
at time he removed IC 601 no more reboot
measured pins 8 and 4 on chip where 4 on + and 8 on - read very low R. i don't know what are the really value to read.. this why we will use programmer help to tell us if this short or not.

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Oh, crap, I get it now, somehow I got it confused with those damn problematic diode packs from other samsung models.

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

it still early to judge.. he need to put it on programmer then it will tell us its short or not... his value read are low to me,, but we need to be more sure..

So, what is there to guess, just measure the resistance between 4 and 8 pin., if there is a low resistance, then spi flash into the trash.

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Thats the datasheet right?: https://cdn.badcaps-static.com/pdfs/...da9d31403c.pdf

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I think Diah wants me to check and confirm IC601 is bad using the programmer

did you order it with clip add ?? because clip much easy to use and good for future use

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

So would this include re-installing IC601 (if it's good) and then removing DT601/DT602? IC601 must be installed to provide VDD otherwise I'll never get a picture right?

No, I would leave it out, don't remember how these are tested, I did see the datasheet somewhere tho.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

it still early to judge.. he need to put it on programmer then it will tell us its short or not... his value read are low to me,, but we need to be more sure..

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Well then, no programmer will help to read data from spi flash if it is short.

I think Diah wants me to check and confirm IC601 is bad using the programmer

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Well then, no programmer will help to read data from spi flash if it is short.

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

This is TVS DIODE, they stand in the protection of the IC601 Spi Flash lines, and if there is no short on these lines, then they are more likely to be alive.

And yet, did you have a short on the 3.3v line and the protection worked, after you removed the IC601, did you lose the short and did the TV turn on without rebooting?

Yes it did stop looping, post #60.

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

No Diah, not the mb, just maybe remove the other DT602 and see if the picture shows up, they are just like the diode packs that are going bad often, correct?

This is TVS DIODE, they stand in the protection of the IC601 Spi Flash lines, and if there is no short on these lines, then they are more likely to be alive.

And yet, did you have a short on the 3.3v line and the protection worked, after you removed the IC601, did you lose the short and did the TV turn on without rebooting?

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

look after CH341a the cheapest and had many helpful ways at repair

I ordered it, should be here Monday or Tuesday, but I will need a little help on how to use it. Maybe a simple step by step to test my IC601?

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Well it's one way of seeing if it is that one that is the problem but do what you want, the tv should display a picture if you have a bad one and remove it, I could be wrong, my memory isn't that great.

So would this include re-installing IC601 (if it's good) and then removing DT601/DT602? IC601 must be installed to provide VDD otherwise I'll never get a picture right?

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

No Diah, not the mb, just maybe remove the other DT602 and see if the picture shows up, they are just like the diode packs that are going bad often, correct?