[howto] Switch boot partitions via micom eeprom C series

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juusso
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[howto] Switch boot partitions via micom eeprom C series

Post by juusso »

After successful repair of damaged D series board AND with help of C series owners bajinchi (LN55C650) and hedak (UExx46C7700), we found offsets, where we can switch between partitions by changing bytes on micom eeprom.

Topic is created by moving various related posts

Under construction
LE40B653T5W,UE40D6750,UE65Q8C
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juusso
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Re: [SOLVED] Forced "toggle" to repair bricked TV?

Post by juusso »

Well, you have to:
1. get arduino network interface (+ arduino/arduino uno to work with)
2. identify micom eeprom and solder required wires
3. get dump of micom eeprom in both active partition sets.
4. Try to make hard "toggle" by changing bytes trough your network interface as i did...

i`m pretty sure you`ll find B0 77 and AD CD bytes inside your micom config as on D series as well. But let`s see... :)
LE40B653T5W,UE40D6750,UE65Q8C
Have questions? Read SamyGO Wiki, Search on forum first!
FFB (v0.8), FFB for CI+ . Get root on: C series, D series, E series, F series, H series. rooting K series, exeDSP/exeTV patches[C/D/E/F/H]

DO NOT EVER INSTALL FIRMWARE UPGRADE

bajinchi
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Re: [SOLVED] Forced "toggle" to repair bricked TV?

Post by bajinchi »

Hi there!

I just received a LN55C650, it have a Weltrend WT61P802 chip, which it don?t turn on, don?t receive IR data from the Remote controller... it?s dead... the only activity is the Red light on in the front of the TV.
Is this model "manageable" with this "toggle" trick?

Thanks in advance

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juusso
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Re: [SOLVED] Forced "toggle" to repair bricked TV?

Post by juusso »

no experience on c series. but worth to try
LE40B653T5W,UE40D6750,UE65Q8C
Have questions? Read SamyGO Wiki, Search on forum first!
FFB (v0.8), FFB for CI+ . Get root on: C series, D series, E series, F series, H series. rooting K series, exeDSP/exeTV patches[C/D/E/F/H]

DO NOT EVER INSTALL FIRMWARE UPGRADE

bajinchi
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Re: [SOLVED] Forced "toggle" to repair bricked TV?

Post by bajinchi »

Thanks for the quick response, so as my Arduino ONE is broken (don?t know why) I desoldered the S24C0 chip to put it in my programmer, and I have this:

Code: Select all

00000000  CD 01 FF 01 FF 04 01 01 00 FF 73 70 61 FF AD FF  ?.?.?....?spa?.?
00000010  FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF  ??.?????????????
00000020  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000030  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000040  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000050  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000060  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000070  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000080  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
00000090  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000A0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000B0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000C0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000D0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000E0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
000000F0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ????????????????
Completely different from what is posted here, I try to change the bytes explained, but nothing. The TV is still with the red light and won?t turn on at all.

Any ideas?

Thanks!

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juusso
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Re: [SOLVED] Forced "toggle" to repair bricked TV?

Post by juusso »

what if:

Code: Select all

00000000  CD 01 FF 01 FF 04 01 01 00 FF 73 70 61 FF AD FF  ?.?.?....?spa?.?
We know what AD CD and B0 77 do on D series. Offset is different but maybe meaning and function is same?
Try replace CD to 77 and AD to B0:

Code: Select all

00000000  77 01 FF 01 FF 04 01 01 00 FF 73 70 61 FF B0 FF  ?.?.?....?spa?.?
LE40B653T5W,UE40D6750,UE65Q8C
Have questions? Read SamyGO Wiki, Search on forum first!
FFB (v0.8), FFB for CI+ . Get root on: C series, D series, E series, F series, H series. rooting K series, exeDSP/exeTV patches[C/D/E/F/H]

DO NOT EVER INSTALL FIRMWARE UPGRADE

hedak
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Re: C Series EEPROM research

Post by hedak »

OK, but how to toggle?

Software way doesn't seem to work. I can see the output of the script 8282119 mentoined here: viewtopic.php?f=51&t=5232#p38077
But the reboot comes within the 3 seconds sleep in usb_remount() :(

So i will have to do it by hardware? Micom?

BTW could you please in short explain, what Micom is and how to idenify its EEPROM?

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juusso
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Re: C Series EEPROM research

Post by juusso »

micom eeprom is located near the big squared shape Weltrend chip. Check photos on my given forum and you will understand what i`m talking about.

/sbin/toggle makes switch of full set of partitions on C series and values for next boot are being stored on that micom`s eeprom. Just as you see, here we again have troubles, dumps of D and C are different. But here we have just few bytes, why don`t experiment with this?
bajinchi wrote:Thanks for the quick response, so as my Arduino ONE is broken (don?t know why) I desoldered the S24C0 chip
LE40B653T5W,UE40D6750,UE65Q8C
Have questions? Read SamyGO Wiki, Search on forum first!
FFB (v0.8), FFB for CI+ . Get root on: C series, D series, E series, F series, H series. rooting K series, exeDSP/exeTV patches[C/D/E/F/H]

DO NOT EVER INSTALL FIRMWARE UPGRADE

hedak
Posts: 81
Joined: Wed Jan 08, 2014 9:21 pm

Re: C Series EEPROM research

Post by hedak »

OK, thanks :)

My Weltrend chip seems to be on the backside whilst its EEPROM is on the front, but they are lying nearly on the same X/Y-position. I will try to read the micom EEPROM (S24CS0) tomorrow. How much memory does it have? Or can you give me a datasheet or link?

EDIT: pictures of the micom EEPROM can be found here (the two latter ones): viewtopic.php?f=15&t=7117&p=53801#p53801
Last edited by hedak on Fri Mar 07, 2014 10:28 pm, edited 2 times in total.

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juusso
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Re: C Series EEPROM research

Post by juusso »

LE40B653T5W,UE40D6750,UE65Q8C
Have questions? Read SamyGO Wiki, Search on forum first!
FFB (v0.8), FFB for CI+ . Get root on: C series, D series, E series, F series, H series. rooting K series, exeDSP/exeTV patches[C/D/E/F/H]

DO NOT EVER INSTALL FIRMWARE UPGRADE

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