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autogenerated
 Post subject: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 27th, 2023, 4:35 
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Joined: November 27th, 2023, 4:31
Posts: 2
Location: England
Hello,
I have HDD Toshiba MQ04UBD200. Disk after connection to USB is totaly dead, only led is flashing. I ordered new donor hdd for PCB replacement, after replacement and changing rom chip, disk is still not detected. I'm thinking about problem with rom. Is it possible to chceck this rom, or fix, if I will update to this forum?
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Lardman
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 27th, 2023, 6:49 
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Joined: November 7th, 2020, 5:31
Posts: 1092
Location: The_UK
autogenerated wrote:
changing rom chip, disk is still not detected.
Why did you chance the board - how did you change the rom and do you have any tool / experience ?

This could have been something simple - but if you've cooked to the rom then it's game over.

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fzabkar
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 27th, 2023, 11:51 
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Joined: September 8th, 2009, 18:21
Posts: 15539
Location: Australia
If you upload the ROM, I can at least test the CPs for you.

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Disk Solution
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 27th, 2023, 13:29 
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Joined: September 16th, 2022, 9:31
Posts: 76
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Nice work may be you damaged the Rom or it is not fit properly as this is your first time, Keep trying if no luck ask forum to rebuild new Toshiba Rom.
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autogenerated
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 28th, 2023, 4:36 
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Joined: November 27th, 2023, 4:31
Posts: 2
Location: England
fzabkar wrote:
If you upload the ROM, I can at least test the CPs for you.


Hi, here is my Rom, readed twice from hdd board. I edited this rom at address 000DCDB0, there was serial number and it is replaced by few XX.
My experience is mostly recovering by DMDE, but a lot of experience with repairing motherboards in laptops. Original rom is still readable and with original content. I have SVOD programmer, TL866 and RT809.


Attachments:
readnoserial.rar [376.53 KiB]
Downloaded 88 times
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Disk Solution
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 28th, 2023, 9:28 
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Joined: September 16th, 2022, 9:31
Posts: 76
Location: World
Toshiba has bubble Rom chip, no 8 pins but 8 connections not easy to assemble even we try 2 or 3 times to be success, or re-establish pcb rom prints for perfect connection. You can also use same Toshiba Rom chips to write backup rom if original chip die, PCB must be compatible.
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fzabkar
 Post subject: Re: Toshiba MQ04UBD200 no reaction, problem with rom
PostPosted: November 28th, 2023, 11:12 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Your edits have affected CP 0x55 and CP 0x56. There is an XOR checksum byte at the end of the CP. This must be recomputed so that the XOR checksum is 0x00. In short, don't touch the ROM. Just leave it alone.

Code:
Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  4D 4E 20 20 20 20 20 20 20 20 20 20 20 20 20 20  MN             
00000010  20 20 20 20 20 58 58 58 58 58 58 58 58 58 54 4F       XXXXXXXXXTO
00000020  53 48 49 42 41 20 4D 51 30 34 55 42 44 32 30 30  SHIBA MQ04UBD200
00000030  20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00000040  20 20 20 20 20 20 00 00 00 00 00 00 00 00 00 00
00000050  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000060  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000070  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000080  00 00 00 00 FF 3F 10 3F B0 88 E0 E8 00 00 00 00 
00000090  05 01 00 01 00 00 00 00 00 00 00 00 00 00 00 00
000000A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000B0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DA

Your ROM is divided into a code section and a CP section.

The CP section begins at 0xD7000. It appears to be OK (apart from your edits). See the attached CP dump and CPlist.txt.

There is a 6-byte CRC of some kind at the end of the code section (offset 0xD6F78). I don't know how to calculate this CRC, so the only solution I know would involve comparing the code section against a ROM with the same version. That said, the very first byte seems in error. It seems that it should be a "C".

Code:
Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  00 6F 70 79 72 69 67 68 74 20 31 39 39 39 20 54  .opyright 1999 T
          ^^

00000010  4F 53 48 49 42 41 20 43 6F 72 70 6F 72 61 74 69  OSHIBA Corporati
00000020  6F 6E 00 00 00 00 00 00 00 00 00 00 00 00 00 00  on..............
00000030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000040  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000050  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000060  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000070  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000080  00 00 00 00 00 00 00 00 78 6F 0D 00 00 70 0D 00
00000090  00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00
000000A0  00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00
000000B0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 18 9C


Attachments:
CPs_00.7z [18.04 KiB]
Downloaded 89 times

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