Repair ZP120

Hello gruve2ths excellent jobb back there once again. Iknow i almost kill it
I can se that the pin 8 from Ic goes to R15543
pin 9 ? the same?
pin 10 R15544
but i missing
pin 3,4,5 and must be sure 10,11,12
Please !:P

sotisg69,
You have to zoom way way in to the pictures that i attached to see traces.
As you can see most of the pins of that IC via down underneath the pads so no visible traces can be found. I suspect the inputs to that chip all come from the controller. The outputs are likely that connector next to the chip.

Gruv2ths
Is there a another way to figure that out?
I will do som measurment tomorow and let you know .
😃

Sotis,
Sorry this took a long time.
So can't help you with all the pins, but but was able to find continuity for a few.
The continuity is between the driver ICs output to the 32 pin connector next to it.
(look at the silk screen around the connector, you will find the pin number guide there)

IC Connector
2 4
4 5
8 23
Sounds like you just may need to get the 36V power converter enable connected.
Maybe if the above doesn't help, You can look at the datasheet for the IC and look at the input pins and see which ones go high when you push play. and go from there.

… use the cheat sheet I made above and see if you have any of the bias converter working.
There was another guy on here with the same symptom as you and I think he gave up. Not sure what causes that.

I finally got back to this -- checked all the DC voltages and they all match your reference. Even with my fluke truerms I didn't validate the secondary but I am guessing I referenced to the wrong point. The DC busses all look OK.

I am thinking to pop off the shield can on the logic board to get at the UART. Any other thoughts? Still a solid white LED.

I lifted the shield can and connected to the UART -- here is what I get.
So I don't forget the pins are vdd,rx,tx,gnd …


U-Boot 1.1.1(1-16-3-0.9), Build: 0.9

MPC8272 Reset Status: External Soft, External Hard

MPC8272 Clock Configuration
- Bus-to-Core Mult 3x, VCO Div 4, 60x Bus Freq 16-50 , Core Freq 50-150
- dfbrg 1, corecnf 0x10, busdf 3, cpmdf 1, plldf 0, pllmf 3
- vco_out 400000000, scc_clk 100000000, brg_clk 25000000
- cpu_clk 300000000, cpm_clk 200000000, bus_clk 100000000
- pci_clk 33333333

CPU: MPC8272 (HiP7 Rev 14, Mask unknown [immr=0x0d10,k=0x00e1]) at 300 MHz
Board: Sonos Wembley
DRAM: 32 MB
DRAM test
Test complete - 1 errors, error pattern 00400000
### ERROR ### Please RESET the board ###

I went ahead and ordered 2 2DRAM parts since I don't know which is bad. Anyone tried this replacement? I might have to remove the shield. If not I'll remove the parts with hot air and then put the new ones down.

Never done this. Looking forward to your results!

Never done this. Looking forward to your results!

Well, I was able to change the DRAM out without much issue. I used kapton, some foil, and the hakko hot air rework. Then I cleaned the pads and put new parts down. Unfortunately, it did not fix it. That pretty much confirms that the issue is probably a cracked solder ball under the BGA, or head-in-pillow or some other similar type defect. I thought about putting it in the xray but it is so hard to see some of these defects and regardless of what I found, it was not repairable.