Samsung QN75Q60TAF Boot Loop fixed but no picture

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

This is the schematic that I posted the motherboard pinouts, not the panel strips.
Panel bar 1pin - goes to the motherboard on 96 pin, and 96pin goes to 1 pin (mirror).

Aaahhhh, Ok. 61/62 at panel end is 36/35 at MB end. So the signals are CLK and HOLD.

Im glad we got that confirmed!

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I've been proving this for a long time!

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Proving what exactly? what is the test and what is the solution?

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Remove these protective diode assemblies and check again, it doesn’t help, put a clean Spi Flash, check with it, if that doesn’t help, then you will need to look for a dump on it under your panel.

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Ok, well that makes 3 of us that have suggested remove both of them and try it, your move Nick, I Have also seen the tech get a good display by removing several of those resistors in the same area of the panel driver board. Can not recall if any were faulty or not, video was not in English.

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I'm trying to do everything you all are saying. I did a whole bunch of checks of the diode packs like @diah asked for in post #113. I can also remove the packs, but just so i'm clear, it is possible to get a picture with the spi flash and diode packs removed?

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

These diodes are not needed here at all, they cause more problems and they can leak and plant signal lines, remove them, everything will work without them, you need to experiment with spi flash.

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

These diodes are not needed here at all, they cause more problems and they can leak and plant signal lines, remove them, everything will work without them, you need to experiment with spi flash.

The SPI Flash is currently removed. Do i need to re-install it for the panel to "potentially" work?

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

She's short circuited.

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

She's short circuited.

If the TV will work without SPI Flash, why buy a new one? What is the SPI Flash for?

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Ok, so looks like your spi flash is junk, so you need a new one, spi flash might hold firmware, so probably no sense trying to get tv going til you get new spi flash, did anyone look up the datasheet, will probably tell you if you need to program it or not, then with fixed spi try tv, if still problem then by all means remove both those diode assemblies on panel driver board.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

why you are hurry by judgments... troubleshooting need steps one by one..
my suggest don't remove any further parts and i did write this.

where are the result of my asking in POST #66 ???
where are the Value list of my asking post #113 ???

do you understand why i wrote this #POST ...???

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Agreed step by step is best, he can't do 66, no programmer yet, and 113 he said will do in post 114 but must have forgot??

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Both you and Lotus said the spi flash looked suspicious, so well if it walks like a duck it's prolly a duck, there seemed to be some difference of opinion about if the programmer would handle the job of telling if the spi is ok or not. So there we are, you 2 pro techs with completely opposite thoughts on it, I know both of you are completely competent, so WHO is right???

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

why you are hurry by judgments... troubleshooting need steps one by one..
my suggest don't remove any further parts and i did write this.

where are the result of my asking in POST #66 ???
where are the Value list of my asking post #113 ???

do you understand why i wrote this #POST ...???

See photo for response to post #113. Don't have the programmer yet, but I can't find the SPI Flash that I removed.....my family might've played with and lost it. I ordered a new one.

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Ok, so looks like your spi flash is junk, so you need a new one, spi flash might hold firmware, so probably no sense trying to get tv going til you get new spi flash, did anyone look up the datasheet, will probably tell you if you need to program it or not, then with fixed spi try tv, if still problem then by all means remove both those diode assemblies on panel driver board.

SPI datasheet

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

See photo for response to post #113. Don't have the programmer yet, but I can't find the SPI Flash that I removed.....my family might've played with and lost it. I ordered a new one.

are this reading while LVDS disconnected !!!!

about the spi. if you don't find it or it damaged during talking it out... the new one will written by MB when there are correct boot / Operation.

but you need to measure it pin the 8 & 4 in reserve way to compare with yours first check

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

are this reading while LVDS disconnected !!!!

about the spi. if you don't find it or it damaged during talking it out... the new one will written by MB when there are correct boot / Operation.

but you need to measure it pin the 8 & 4 in reserve way to compare with yours first check

LVDS was connected. You didn't specify in post #113, or I missed it somewhere else. You want me to take new readings with LVDS disconnected?

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

LVDS was connected. You didn't specify in post #113, or I missed it somewhere else. You want me to take new readings with LVDS disconnected?

i think i write before.. ""right now MB after remove IC601 boot correct BL okay...Sound OK and we should not back consider right now on MB""... it logic talk that after this test point our focus will be on Panel but as SOLO because this is measurements of Diode mode and R so we don't need MB interface with any reading.

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

i think i write before.. ""right now MB after remove IC601 boot correct BL okay...Sound OK and we should not back consider right now on MB""... it logic talk that after this test point our focus will be on Panel but as SOLO because this is measurements of Diode mode and R so we don't need MB interface with any reading.

See attached....