Which ic generally used for software updates?

[caphair]

Hi I'm curious which ic would generally be the one used for software information/updates/restoring

Have an Apple TV that isn't being recognized by any computer. Just gives a "USB device unrecognized" message

I found this tear down of the the model I have which points out certain chips but not specifically what each does

https://www.ifixit.com/Teardown/Appl...+Teardown/8293

[stj]

Re: Which ic generally used for software updates?

put it in DFU mode and then scan the usb bus for unrecognised vid/pid numbers

[caphair]

Re: Which ic generally used for software updates?

put it in DFU mode and then scan the usb bus for unrecognised vid/pid numbers

Scan it how? Tried putting it in DFU mode before but still got same unrecognized message

[caphair]

Re: Which ic generally used for software updates?

I used a program called UVCView and got this information

[stj]

Re: Which ic generally used for software updates?

is it giving a vid & pid to the o.s.?

[caphair]

Re: Which ic generally used for software updates?

Shows 0000 for both pid and vid. What are those anyway?

[stj]

Re: Which ic generally used for software updates?

vid = vendor ID, pid = product ID

those 2 numbers tell the o.s. what it is, and what driver to use.

[stj]

Re: Which ic generally used for software updates?

http://appletoolbox.com/2013/07/how-...into-dfu-mode/

[caphair]

Re: Which ic generally used for software updates?

Thanks actually used that same link to try getting into DFU. It blinks as it should but computer/iTunes still doesn't recognize it.

Even tried changing the driver to an Apple DFU one when the Apple TV is plugged in and still nothing.

Does this mean the ic responsible for all that info is bad?

[stj]

Re: Which ic generally used for software updates?

well the fact that it responds at all means the cpu is at least partly working.
maybe the vid & pid are stored in an eeprom.

try looking for a schematic.

[caphair]

Re: Which ic generally used for software updates?

Tried but with Apple it's almost impossible finding one. Only thing I found was that tear down I linked in original post

[fzabkar]

Re: Which ic generally used for software updates?

If you connect the Apple device to your PC without powering the device on, does the PC still sense something on the USB port? If so, then it could simply be sensing the pulldown resistor(s) on the USB Data+/- pins.

Do the Apple TV's other functions all work properly?

[caphair]

Re: Which ic generally used for software updates?

No it doesn't sense anything at all on the USB without power to the device. The Apple TV 3 needs to be plugged in for a PC/iTunes to recognize it.

The only things that function are the power on LED which blinks as it should when I try putting it into DFU but other than that I get a "no signal" when connected to a tv and can't use it

[fzabkar]

Re: Which ic generally used for software updates?

I can't see which chip handles the USB comms, but U300 appears to be handling the HDMI port. There are 4 differential signal pairs between U300 and connector J6404. D6510 and D6511 are ESD protection diode arrays (CDDFN10-0524P). I'd check whether any of the pins (1,2,4,5) are stuck at ground or the supply rail.

CDDFN10-0524P, Bourns, 5V Surface Mount TVS Diode Array (for HDMI 1.4 & USB 3.0 / USB OTG):
https://cdn.badcaps-static.com/pdfs/...0f2613a076.pdf

Edit: U300 has an additional differential pair at the side closest to the edge of the PCB. This may connect to the USB 2.0 pins. It might be worth testing for continuity between J6404 and this differential signal pair.

[caphair]

Re: Which ic generally used for software updates?

Thanks for that info and your suggestions! Unfortunately after taking mine further apart the circuit board is different than the one pictured in that link and there is no u300.

It seems to have more ICS and no real space for test probes just a bunch of test points. So without a schematic, Apple succeeded in eliminating a home repairer to tackle a fix. Guess I'll just put it in a junk bin

Thanks for everyone's help anyway!

[fzabkar]

Re: Which ic generally used for software updates?

I found a lot of datasheets while I was researching this thread. Many of my notes are in point form, but hopefully they will be of some use to others.

BCM4330, Broadcom, Single Chip IEEE 802.11 a/b/g/n MAC/Baseband/Radio with Integrated Bluetooth 4.0 + HS and FM Transceiver:
http://www.broadcom.com/products/Wir...utions/BCM4330
https://cdn.badcaps-static.com/pdfs/...9259b8ddd9.pdf


LAN9730, SMSC, High-Speed Inter-Chip (HSIC) USB 2.0 to 10/100 Ethernet Controller, 56-pin QFN, 3.3V:
https://cdn.badcaps-static.com/pdfs/...d9d9204aa1.pdf

8456E-R, DELTA, magnetic LAN coupler: (LFE8456E-R)
(pinout on page 24 of schematic)
http://www.deltaww.com

TPS54418, Texas Instruments, 2.95 - 6V, 4A, 2MHz step-down current mode regulator:
https://cdn.badcaps-static.com/pdfs/...8d0e2c25a8.pdf

SKY65404-31, Skyworks, 5 GHz Low-Noise Amplifier, 2.8 - 5.0V, marking SKY3 5404, 6-pin:


uPG2185T6R, Renesas / CEL, GaAs IC SPDT Switch for 2GHz to 6GHz, 6-pin, marking G8:



TXC Mn40 25.000 (25MHz crystal) - also marked elsewhere as Mp3G
TXC Mn41 27.000 (27MHz crystal) - also marked elsewhere as Mp3H
http://www.txccrystal.com

THGVX1G6D2HLA01, Toshiba, 8GB NAND Flash:
http://www.toshiba.com/taec/Catalog/...lineid=1768484

CDDFN10-0524P, Bourns, 5V Surface Mount TVS Diode Array (for HDMI 1.4 & USB 3.0 / USB OTG):
https://cdn.badcaps-static.com/pdfs/...0f2613a076.pdf

SCH1433, ON Semiconductor, Power MOSFET 20V, 64mO, 3.5A, Single N-ch, marking ZJ:



Apple 343S0479 is "Unclassified found in the Apple MC572C/A, MD199C/A" (HDMI, U3000):
https://chipworks.secure.force.com/c...u=APP-343S0479

Apple 338S1040-A5 "power management (PMIC) & audio IC made by Dialog", 4 (?) x switchmode outputs (U2000):
https://www.techinsights.com/teardow...s-amazonfiretv
http://www.anandtech.com/show/5687/a...-mini-review/2

V301 - has 8-bit bus


Apple A5 Single Core processor

"The A5 PoP assembly breaks down into a Hynix LP DDR2 SDRAM and an application processor that carries the part number APL2498 and 8942C01 (third image)."
http://www.chipworks.com/en/technica...cent-teardowns

http://web.archive.org/web/201204130...rise-surprise/

http://webcache.googleusercontent.co...-mini-review/2

"Below that we get the new A5, its PMIC to the left, marked 338S1040-A5, and to the right another Apple-branded package marked 343S0479 which previously was on the other side of the PCB in the Apple TV 2. The markings on top of the A5 (we're looking at the DRAM PoP here, actually) indicate a single Hynix 32-bit 512 MB LPDDR2 device, up from the 256 MB of LPDDR2 in the Apple TV 2."

http://pinoutsguide.com/PortableDevi...i_pinout.shtml
http://pinoutsguide.com/Slots/usb_3_...r_pinout.shtml
https://en.wikipedia.org/wiki/Package_on_package

[stj]

Re: Which ic generally used for software updates?

this may be pretty close.

[caphair]

Re: Which ic generally used for software updates?

Would the A5 chip be responsible for video output or something else?

[stj]

Re: Which ic generally used for software updates?

i think the gpu is in it, but there will be other chips between the output and the display and base-connector.

[caphair]

Re: Which ic generally used for software updates?

Hmm because I have another one that's giving a "no signal" except this one was recognized by the PC and I was able to do a restore but still no display.