Samsung HG49EE690 Hospitality TV reboot issue Mainboard BN94-11086A

[alltvrepairs]

Hi,

I have 3 of these TVs for repair with same problem of going to standby after around 10minutes and start again continuously. I have tried a new SPI 25Q40 but fault remains. Am suspecting a CPU problem as it gets a bit hotter than I expect.
This seems to be a common problem in these models. I am 100% sure it is a mainboard issue as I have fitted a spare from a normal TV from a UE40K5607 and stays on (diplay inverted but I managed to rotate in SM using a different display).


Any help appreciated!

[labello]

Hi is the chip for sure!! You can buy it and replace it if you have the right tools of course

[alltvrepairs]

I am like 80% sure. I might be able to replace it however not sure am able to reprogram the MMC because 99% it will be sold as new and blank internal ROM.

[labello]

I am like 80% sure. I might be able to replace it however not sure am able to reprogram the MMC because 99% it will be sold as new and blank internal ROM.

You can find the chip already reprogrammed. Anyway , ae you sure that power supply is good..? Turn the tv on without the main board (tuner) only with power supply, if the led of pannel comes up and staying on then you have the answer is the main board faulty... like I said you can find the chip already programmed find some research on Google...

[alltvrepairs]

You can find the chip already reprogrammed. Anyway , ae you sure that power supply is good..? Turn the tv on without the main board (tuner) only with power supply, if the led of pannel comes up and staying on then you have the answer is the main board faulty... like I said you can find the chip already programmed find some research on Google...

Am not aware where can I find pregrommed Chip. Will look up some more sites. As far as I know, sites like Aliexpress sell it new blank.
I have set the 'Hospitality' option to ON in service mode with the ue40k5607 main board in place. However am not sure if the apps installed on the original board can work n this replaceable board.

[labello]

Am not aware where can I find pregrommed Chip. Will look up some more sites. As far as I know, sites like Aliexpress sell it new blank.
I have set the 'Hospitality' option to ON in service mode with the ue40k5607 main board in place. However am not sure if the apps installed on the original board can work n this replaceable board.

Ok, do you have the mark of the chip what you need? If yes just search it with the (mark) on it or with the model number of your board..👍

[labello]

Don't worry about the app, if the chip is the same or compatible everything works fine. Bye

[alltvrepairs]

Hi again,

CPU is SEMS31 BGA

Am not 100% if CPU failure as tried to heat it up and didn't conclude that with extra heat trips quicker.

I would need a GPU and a stencil. Any recommendations for a good quality but not too expensive solder and cleaner?





Thanks!

[Davi.p]

before trying a cpu reballing you need to do heat tests also on ram / rom chips..
try also eventually freezing on a certain chip to see if it takes life again for minutes..
since cpu is too hot can be cpu balls or both cpu/ram, cpu/rom..

[labello]

before trying a cpu reballing you need to do heat tests also on ram / rom chips..
try also eventually freezing on a certain chip to see if it takes life again for minutes..
since cpu is too hot can be cpu balls or both cpu/ram, cpu/rom..

That's right! Try to put on it some spry ice and turn on the TV if it burns up it's him!

[alltvrepairs]

I have tried heating and freezing CPU / RAM / DC - DC convertors and all around board including HDMI chips. But could not conclude if the heat / freeze is changing the duration So changing the CPU is a wild guess and I think is not worth the time and cost and risk after all.

[Davi.p]

indeed the freezing with air can cannot cool the bottom of bga chips, need a total board freeze in a domestic freezer..

[labello]

If you want existing the solution of repairing audio and power also... Depending of you..