TP.MS3463S.PB711 Start up loop

[MarkC1970]

I have a TP.MS3463S.PB711 that is boot looping. Immediately you apply power the standby LED turns white but it doesn't start up. After about 30 seconds it goes red for a second and then back to white.

I have 40v for the backlight but no boost. Pin 8 (PWM) for the backlight boost is 137mV so it is off. DB101 is generating the 12v rail. The 5v rail is produced on LD1, the 3.3v is present on UL1 and the 1.2v is on LD2.

We appear to have all the power rails, no short on the backlight or anywhere else I have checked but she will not start up. Any ideas? Thanks.

[lotas]

Re: TP.MS3463S.PB711 Start up loop

Maybe it's in the firmware.

[MarkC1970]

Re: TP.MS3463S.PB711 Start up loop

Thanks. I could take the NAND off and get an adapter for my TL866ii but I can't find a NAND dump for my particular model of TV. Any idea how specific these NAND dumps are? I am thinking about screen resolution etc. Cheers.

My TV is a Sharp LC-32CHF5111K

[lotas]

Re: TP.MS3463S.PB711 Start up loop

There is no Nand, there is SPI Flash 25Q64, put your dump here, I will check it.

[MarkC1970]

Re: TP.MS3463S.PB711 Start up loop

I thought it was in the TSOP48 and the underside.

Well that is interesting because this board has no IC populated there and neither does a donor board that I harvested some backlight parts off but never touched.

I wonder if there are different versions built on the same PCB?

I can't seem to embed the picture but it is at https://photos.app.goo.gl/56uAEviUx19RbNVKA

[lotas]

Re: TP.MS3463S.PB711 Start up loop

Yes, it turns out there are two versions, with spi and nand firmware.

[MarkC1970]

Re: TP.MS3463S.PB711 Start up loop

Any idea where I can source the NAND dump so I can reflash it? Pretty good chance it is that.

[Diah]

Re: TP.MS3463S.PB711 Start up loop

search the form we do have user from Philippine faced same issue.. it was one smd Dc-DC regulator close to main cpu defect.

[Willail]

Re: TP.MS3463S.PB711 Start up loop

Yes, it turns out there are two versions, with spi and nand firmware.

Hello Lotas,

How are you? I have a pb with my sharp TV LC48CFE4042E, mainboard TP. MS3463S.PB711.
If i send you the dump of the spi fash of the TV, could you repair it?

Thanks

[lotas]

Hello Lotas,

How are you? I have a pb with my sharp TV LC48CFE4042E, mainboard TP. MS3463S.PB711.
If i send you the dump of the spi fash of the TV, could you repair it?

Thanks

Okay, show me your dump, I'll take a look.

[lotas]

Can't post the dump?

[Willail]

Hello Lotas
This is the fileSharp 25Q40 LC48.rar

[lotas]

Hello Lotas
This is the fileSharp 25Q40 LC48.rar

Try.
There are two dumps in the archive, the original one is fixed, the second one is also fixed and cleaned (nvm -FF...) The file name should be 25Q64, not 25Q40.

[Willail]

Hello Lotas,

Thank a lot for the two dumps. I will test them quickly.
Could you help me to fixed my graphic board Radeon HD7870 2G?
The graphic board was not use during 1year, then i used it 1 month ago, in my pc, no post and black screen. I check the mosfets, some of them seem to be bad but when i remove them and test them, they are good.
I don't understand why i have always shorts on the pcb when i test Drain and Source (Mosfets removed). Do you think that the gpu is shorted?
Some pictures of my graphic board
Thanks

[Willail]

Try.
There are two dumps in the archive, the original one is fixed, the second one is also fixed and cleaned (nvm -FF...) The file name should be 25Q64, not 25Q40.

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Hello Lotas

Thank a lot for your dumps. The first corrected dumb works well.
Thank you

[lotas]

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Hello Lotas

Thank a lot for your dumps. The first corrected dumb works well.
Thank you

Ok!