Samsung QN75Q60TAF Boot Loop fixed but no picture

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Leave it off and remove the other one.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

Diah, I removed IC601 and everything else connected normally, mask removed and the boot loop is gone. The TV boots up, I hear the little samsung jingle and no picture.

write the label No of this IC

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

write the label no of this ic

gd25b32csig

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

gd25b32csig

GD25B32C I/O NOR Flash..

he need first to check with Diode mode between pin 8 VCC and pin 4 GND

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

1.727 VDC - Neg lead on 4, Pos lead on 8

0.557 VDC - Pos lead on 4, Neg lead on 8

No beeps

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

1.727 VDC - Neg lead on 4, Pos lead on 8

0.557 VDC - Pos lead on 4, Neg lead on 8

No beeps

its low to me..
try to dump it hope yours programmer can read it.

if it did... mean good sign

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I don't think he has a programmer.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I don't think he has a programmer.

well if his measurements at post#65 correct... then he should put in programmer to check if it can read or not. this is the only way i do know to test NOR... if some one know other way .. welcome.

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I do not, so now what, take the other one off?

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I don't have a programmer, no. My readings in Post #65 are correct.

@nomoresonys, are you suggesting take of DT601 and DT602?

[lotas]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

What is the resistance on these pins (1,2,3,5,6,7) relative to 4 pin. (GND) without ic601?

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

They are all open to GND

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

don't take any parts out from the boards... buy cheap programmer and test the NOR you get it out

[Nicktronic]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

can you provide a link? Thanks.

[Diah]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

can you provide a link? Thanks.

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

[nomoresonys]

Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

I don't have a programmer, no. My readings in Post #65 are correct.

@nomoresonys, are you suggesting take of DT601 and DT602?

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.

[Diah]

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.

i know what you are thinking... and you may right... the t-con on the MB are toasted so no Picture or any sign... but we cant ask him right now to change MB... unless we do know the panel worth to replace MB ..

[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?

[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?

[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?