Samsung 65MU7350 problem

[freeman3020]

Hi all,

I have problem with my new samsung TV 65MU7350 suddenly its switched off then i tried to power it up again , only backlight switch on the off and continue in this repeat boot without any picture on screen , i have worked tv 65NU7100 , i took powersupply with same connector for mainboard and put it on MU one without connect backlight because connector different ,also TV not turn on

i return powersupply to working TV , now its not work its boot on repeat loop only backlight

what's this mean?? there is pin on power supply named fail count, is this mean power supply have eeprom to store fail and how to bypass this?



attached board of MU7350

[budm]

Re: Samsung 65MU7350 problem

What are the P/N for each one of the power supply board? BN44-?????

[freeman3020]

Re: Samsung 65MU7350 problem

i think its not problem with power supply, main board need to reset?

i tried to reset flash and eeprom , i don't know what's flash using for? i shorted firstly upper flash with shorted nreset with sda , then tried with eeprom same method.

is this wrong?

My local service repair same problem without change any board , then its reset problem as i think

[freeman3020]

Re: Samsung 65MU7350 problem

What are the P/N for each one of the power supply board? BN44-?????

bn44-00932A

[freeman3020]

Re: Samsung 65MU7350 problem

when disconnect screen 2 ribbon -i can hear sound when use remote and backlight still
on !!!

[budm]

Re: Samsung 65MU7350 problem

So both power supply are BN44-00932A?
They cannot be the same since in your post #1 you said "i took powersupply with same connector for mainboard and put it on MU one without connect backlight because connector different"
And "i return powersupply to working TV , now its not work its boot on repeat loop only backlight" so the working TV is also not working now or what, it is confusing.
We also need the pictures of the whole back side of the TV showing all the board.
If you disconnect the cable between the main board and the power supply board, do the backlights come on and stay on as long as the Tv is plugged into the AC outlet?

[freeman3020]

Re: Samsung 65MU7350 problem

so now i have NU one only , First screen repaired ,technician repaired it without soldering or changing board, how?

when disconnect main board , yes back-light work ,and when disconnect 2 ribbon cables from screen , screen work with sound and not turn off, the problem now , when connect screen "Glass" turn on then off without picture and repeat this loop

can you explain to me the flash rom with label t-con for what? i rest it by short nreset and sda .is it erase any thing?

[budm]

Re: Samsung 65MU7350 problem

so now i have NU one only , First screen repaired ,technician repaired it without soldering or changing board, how?

when disconnect main board , yes back-light work ,and when disconnect 2 ribbon cables from screen , screen work with sound and not turn off, the problem now , when connect screen "Glass" turn on then off without picture and repeat this loop

can you explain to me the flash rom with label t-con for what? i rest it by short nreset and sda .is it erase any thing?

That indicates problem on the panel itself which can be as simple as shorted caps on the tab bonding board or worst case will be the shorted COF.

[freeman3020]

Re: Samsung 65MU7350 problem

That indicates problem on the panel itself which can be as simple as shorted caps on the tab bonding board or worst case will be the shorted COF.

but screen worked before take power-supply from it and main board not removed

[budm]

Re: Samsung 65MU7350 problem

I do not know what else to tell you.
BTW, you are talking about the ribbon cables between the T-CON board and the LCD panel, correct?
May be you should show the pictures of the whole backside of the TV showing all the boards.

[freeman3020]

Re: Samsung 65MU7350 problem

I do not know what else to tell you.
BTW, you are talking about the ribbon cables between the T-CON board and the LCD panel, correct?
May be you should show the pictures of the whole backside of the TV showing all the boards.

thank you but it's secret in 2017-2018 version , hope to find solution
there isn't T-con board, ribbon from tab bonding board to mainboard

[Diah]

Re: Samsung 65MU7350 problem

your first TV 65MU7350 was SPI Flash firmware which they flash it again on the eeprom.

yours second TV 65NU7100 which you used the PWB to test your first one. you said the plug from PWB to MB are same.. this is not true. the size & type are same but the PIN may not same assignment. so post photo on yours 65NU7100 PWB especially on the socket to compare it with yours first post photo.

[freeman3020]

Re: Samsung 65MU7350 problem

your first TV 65MU7350 was SPI Flash firmware which they flash it again on the eeprom.

yours second TV 65NU7100 which you used the PWB to test your first one. you said the plug from PWB to MB are same.. this is not true. the size & type are same but the PIN may not same assignment. so post photo on yours 65NU7100 PWB especially on the socket to compare it with yours first post photo.

now forget 65MU7350 , technician repair it without soldring any thing it was same problem of NU , now i need to repair NU one by my self

for pic you request ' im sure its same pins

[Diah]

Re: Samsung 65MU7350 problem

okay.. the pins are same. yours 65NU7100 had T-CON its on the panel Tap installed. the cable you disconnected from MB to Panel are LVDS. not ribbon .
you did short contact on the MB?
try to reset the LVDS again. and tell if you can put the TV in stand by mode

[freeman3020]

Re: Samsung 65MU7350 problem

okay.. the pins are same. yours 65NU7100 had T-CON its on the panel Tap installed. the cable you disconnected from MB to Panel are LVDS. not ribbon .
you did short contact on the MB?
try to reset the LVDS again. and tell if you can put the TV in stand by mode

i did't make any short on MB, how to rest LVDS?

[Diah]

Re: Samsung 65MU7350 problem

reset it mean plug them out from both side and plug them back again .

also plug out the TV from wall socket.. keep it out foe awhile.. then press power on the TV side panel.. keep press then plug it back to wall socket.. keep press the power until the LED indicator changed to RED color

[freeman3020]

Re: Samsung 65MU7350 problem

reset it mean plug them out from both side and plug them back again .

also plug out the TV from wall socket.. keep it out foe awhile.. then press power on the TV side panel.. keep press then plug it back to wall socket.. keep press the power until the LED indicator changed to RED color

i unplugged cables any wait 10 minutes ,, where is t-con on this board

[budm]

Re: Samsung 65MU7350 problem

thank you but it's secret in 2017-2018 version , hope to find solution
there isn't T-con board, ribbon from tab bonding board to mainboard

So the panel has integrated T-CON.

[Diah]

Re: Samsung 65MU7350 problem

need to take out the metal shield to see the T-CON chip leave this point and inspect LVDS the silver pins from both side to be sure all are in place and not one broken.. then replace them back and do the power as i explained

[freeman3020]

Re: Samsung 65MU7350 problem

need to take out the metal shield to see the T-CON chip leave this point and inspect LVDS the silver pins from both side to be sure all are in place and not one broken.. then replace them back and do the power as i explained

these cables not disassembled before , but also i removed metal shield and checked no problems on any cap , and i plugged it again , same problem back light switch on and here start sound then restart without any picture on screen