Philips TV keeps restarting, is this MB the same as mine please?

[ljubisa86]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Hello all,

I have the exact problem. any solutions?

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

It didnt work with a heat gun neither.
I think I'm going to find another MB. But does someone know if a MB that has the same reference but not mounted on the same size TV, will work? thanks

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Ok I heat 15 minutes with a hair dryer and it didnt do much.
I will fire the heat gun this week-end.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

oh okay I think I understand now, you want me to use a heat gun so it can melt any bad connexion/welding and make a good contactin case of a bad one, so it fixes the tv?
I thought you asked me to remove the heat sink that's why I told you about the 2 pins to remove, in fact you asked me to heat the area so it can fix bad soldering.
Ok I will do this probably tomorrow if I can get a heat gun, I'll update you, thank you very much mate

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

I have a soldering iron can I use it to melt the 2 pins instead? the heat sink really seems held by these

Man i am talking on solve problem if the main CPU have BGA issue (BGA mean one of it joint pints had bad contact open ) so packing the whole things could help

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

I have a soldering iron can I use it to melt the 2 pins instead? the heat sink really seems held by these

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

dont buy from aliex....
if you dont have hot air gun... use yours often but don't use it with air .. just heat the often to maximum the up and down heat... cover your mb sockets and plastic with aluminum paper don't let aluminum paper touch them just make some thing like cup to cover them.

when often reach the max put boards and don't move it at all.. after 5.7 minutes turn off the often and just open the door to keep it cool down..

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

I only have a hair dryer it won't be enough I think. I can get a heat gun but in 4-5 days.
Meanwhile I'm trying to find another MB.

This one on aliexpress is the exact same (white sticker not exact match though, but the ref printed on the board is the same as mine 715G6092-MOD-000-004K but it was mounted on a 47" not 40")
https://fr.aliexpress.com/item/1005001623527730.html

And this one on ebay, not the same ref, last digit not the same
https://www.ebay.fr/itm/284919155130

Do you think I can buy one of these and inject my original firmware?

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

leave it.. you need other MB... if you have hot air Gun good to try heating this heatsink from top with 280° 3 minute .. so it could help if there BGA on Soc will be connect again

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Thanks, here is a video I can't see any clip
https://streamable.com/ieuw8y

There is no other equipment linked to the tv, no wifi speaker nothing.
Thanks

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

no. dont unsolder them.. from the top at the heat sink they are connected as clip.. look carfully

so what i mentioned bnefore was correct the area of the CPU realy warm and changed color...
your BL even if they are defect... yours tv will work because we dont have BL_Error pins on the socket CN9101. so the issue on MB
try to unplug any load on the MB like wifi speaker.. and turn on.. also you can disconnect the IR section too.. if thius didnt help i assume you have 99.9% BGA on the main IC

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Yep I just have a multimeter guys I can't capture the boot log with a USB to serial adapter.

Ok let's take a look at the CPU then, Diah could you please confirm I just have to unsolder these 2 pins to remove the heat sink and have access to the cpu? thanks

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

LOL Maloobs, what we can more if his knowledge not as expected..
@alfonzzo:
SDM are soldering point will be find on the Main Boards if we shorted to chassis this mode will be active.. but as Maloobs wrote regard to the service manual your boards didn't have, so forget this point.
another point you didn't understand it what Maloobs wrote.. about capture the boot log. this procedure need USB TTL or USB to serial adapter and use any terminal at windows or Linux .. we connect RX and TX of the adapter to UART port which you have on the MB. this will show us the start protocol on the Terminal. i am not sure if you are able to this test point.!!
let see the area of the main CPU on the mainboards.. from downside like this photo you upload i can see there are change at the boards color caused by heating.. if this the case mean the Main CPU could got BGA issue because of the heat.. so remove first the heat sink which cover the main IC, and show us clear photo of the back side exactly the area under the Soc. and you can confirm with your eyes if what i mentioned color change was true or not.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

How can I boot into this SDM mode so I can get the processor informations?
I guess it's like booting into safe mode on windows laptops.
I still have the original remote, the tv doesnt respond to it though.

Ok let's follow Diah's advice Thanks guys !

[Maalobs]

Re: Philips TV keeps restarting, is this MB the same as mine please?

I don't know about clever, but reading the serial output from the processor during the boot-up can give you a lot of information about what's going on, as shown here.

The SDM (Service Default Mode) when it was a hardware feature, and your TV is from that era, was a way to force the TV to keep all power rails on even when the TV enters protection mode.
This would allow you to measure each rail and to find short circuits.
This is what Diah was asking about to find on the main PCB.

If you had it running for 90 minutes and there was no blinking, then keep following Diah's instructions.

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Ok I removed the connector to be able to see all of the pins.
Here are the measures I got (connector removed).
I won't be able to take measurement with the connector on, because it's not accessible for me due to all the components around, there is no place to put the probes. So I had to remove the connector.


@Maalobs, tv is on for around 1h30 now and still rebooting, no red light.

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

you have 14 pins. they are 2 line of pins

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

<removed>

[alfonzzo]

Re: Philips TV keeps restarting, is this MB the same as mine please?

Thank you much Maalobs, even if I understood half of what you wrote (because of my lack of knowledge) I'm sure it's very clever stuff
Ok I plugged the TV it's 3:48pm let's see for how long it will reboot, I'll check the red led regularly to see if it comes up.
Downloading the service manual right now thank you.

Thanks Diah for the following up. The CN9101 seems to only have 7 visible pins (I measured them in post #46) , how can I measure pins 9&10 please?

[Diah]

Re: Philips TV keeps restarting, is this MB the same as mine please?

thanks Maalobs. we do know the start boot script first section to load Logo there are no protection. after logo steps start the protection. from the chart i would like him first to termenated at the scoket CN9101 pins 9&10. as this line not only for audio but i think for Tuner too. if there any fault at MB audio or tuner section.. tv should boot complete.