Where are TV9 and TV10 on PCB 810035

[Pc Guard]

I need help locating the test points TV9 and TV10 ona PCB 2060-810035
A WD 4TB hdd stays on BSY, and I need to short it.

TIA

Attachments

PCB 2060-810035

[pclab]

Convert to SATA and then you can edit ROM (change zones for instance) and skip the bsy situation

[Pc Guard]

Thanks for your time.
Let me give you some extra information on this case.
When connecting the drive, it gets stuck on BSY.
No clicking sounds

I am using MRT Equalizer.
Already extracted ROM, unlock it (with 411 disable), and wrote it back to the ROM chip.
But the drive still stuck at BSY.

That is why I'm asking for help locating TV9 and TV10 and see if I can force the drive to avoid the BSY state

I hope it makes sense

[fzabkar]

See this thread:

https://forum.hddguru.com/viewtopic.php?t=43533

The MCU is a Marvell 88i1054-NXZ2.

This PCB has the same MCU:

https://recuperodatos.com/disco/western-digital-wd20ezaz-22l9gb0-hdd-3-5-sata-2000gb-595-21683

Here are photos of top and bottom:

https://img01.obyava.ua/classified/0/2537/5412/5q21poqeongckuat.jpg

https://img01.obyava.ua/classified/0/2537/5412/3mjr5ohlk4bm6wyc.jpg

You can see TV9 and TV10.

Here you can see the exposed area under the MCU. The read channel is visible. You can trace the read channel pair to the underside of the PCB. They appear to be the two vertically aligned vias immediately to the right of the USB connector.

https://forum.hddguru.com/download/file.php?id=24238&mode=view

[fzabkar]

I think these are the read channel locations.

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[Pc Guard]

Thanks fzabkar !!
Very valuable information!

[northwind]

These are indeed the read channel points.
However, a spyglass with blocked 411 that stays BSY needs investigation. It should come to DRD state quickly and allow SA access after loader upload. If it doesn't, then probably some mechanical or PCB failure is hiding under the hood. OR, mrt has done it again
I haven't touched TV9+TV10 for maybe 15 years now.

[pepe]

it does not even need loader after blocking 411...

[fzabkar]

Can you upload your original ROM? Perhaps it is corrupt.

[gps31]

As per MRT Equalizer TV9-TV10 marked

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[pepe]

TV9-10 has nothing to do with sata, consequently nothing to do with mrt equalizer i think

[fzabkar]

TV9-10 has nothing to do with sata, consequently nothing to do with mrt equalizer i think

The "equalizer" is much more than just a USB-SATA converter.

[pepe]

it still has nothing to do with read channel, does it?
the image is pretty blur, i can't make out much...

[fzabkar]

It allows you to access the read channel. That's what the OP wants, for whatever reason.

As for the poor quality photo, that's normal for this place. I do recall another thread with a better photo, though. I think I managed to identify many of the ICs.

Similar PCB:

https://us.mrtlab.com/uploadfile/202308/11/1624344533.png

U2 is a 2-channel SATA 6-Gbps redriver, SN75LVCP601.

https://www.ti.com/product/SN75LVCP601

U8 is CH9102X, a USB to High Speed Serial Port Chip:

https://cdn-learn.adafruit.com/assets/assets/000/111/949/original/CH9102DS1.PDF?1653415979

[fzabkar]

U7 is a W806-C200 32-bit SoC:

https://manuals.plus/asin/B0F38W6GMM

Switch SW appears to short the read channel at P6 and P7.

[pepe]

Ah, ok, now i see this one is for a specific WD pcb, not a generic signal conditioner, which i thought it is... yup, it has pins for shorting the channel indeed.
sorry for my confusion

[fzabkar]

As per MRT Equalizer TV9-TV10 marked

Would you please identify the markings on U11, U12, Q2, U1? I'd like to write a tutorial on these boards. I think they are a great idea.

For example, these boards appear to dump the ROM while holding the MCU's reset pin low (J8). That's the smart way to do it. However, it's strange that MRT doesn't do the same for the bridge IC's reset pin.

[fzabkar]

My "reverse engineering" so far ...

I still need U11 and U12. I'm guessing that U12 is an open collector/drain logic gate. U11 appears to be a dual channel device that conveys serial Tx/Rx data between U7 and U8.

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[fzabkar]

U12 appears to be a TS5A3167 analogue switch.

TS5A3167, Texas Instruments, 0.9Ω 1-channel 1:1 SPST Analog Switch, 1.65V - 5.5V supply, marking JATF/JATH/JATP/JATR, SOT-23-5:
https://www.ti.com/lit/ds/symlink/ts5a3167.pdf

I did some similar work here:

https://forums.recoveryforce.com/viewtopic.php?p=2528 (dead URL)