EMMC PIN CONTACTS DETECTED BUT BUT TIMES OUT (FAILS TO READ)

[Skhumbuzo]

Код: [Выделить]

Hi Masters. I have SKYWORTH TV Boards failing to read or verify EMMC Data. Either on board (ISP) or on the EMMC adapter (Pins detected) but times out- fails to read Boot or User. I have replaced 3 boards so far. Even working boards can not be read. I am using RT809H.
Boards: A9K8CG _ N012406-002691-003 TV Model- 85G6700G , A9K84G_N012406-002343-006 TV Model- 65SUE9350F. 
CPU-MT9602.
 Please help me!!!!!!!!

[CAIIIA]

С229 or C232 must be connected via short wire to GND.

[Skhumbuzo]

As a good measure I disconnected the Clock Res -R1M18 and Grounded the CPU's  reference oscillator  crystal 2pins  (C229 & C232) I used an external 3.3v source to U3P6 since on this board this voltage comes only when TV is ON (out of standby).
1st I thought my RT809H was faulty but when I tested with other emmc chips it worked. That is when I removed the chip to try it with the EMMC adapter. 
On the other board I realized the CMD pull-up resistor was never factory fitted and adding it did not help. 

[CAIIIA]

Try temporarily disconnecting the CMD line from the cpu. VCCQ recieves 1.8V?

[Skhumbuzo]

Correction - Clock Res R1M8 (not R1m18)

[Skhumbuzo]

Ok I will try with CMD resistor disconnected tomorrow morning & revert, thank you for your effort.

[Skhumbuzo]

Thank you very much, disconnecting CMD resistor helped. I am now backing up the 14Gb data.

[CAIIIA]