Un50mu6070 Mainboard issue

[petersor]

Got it. Thanks for the clarification. I'll give that a try today.

Rich

[petersor]

No shorts on the data lines. With the jumper in place, the behavior of the TV is the same with both LVDS connected, left connected only, right connected only and both disconnected . . . 1-2 second flash of the standby light with about 15 ~ 18 seconds between flashes. Same as before.

Rich

[lotas]

Disconnect the wi-fi module, also check these contacts for resistance to ground (LAN).

[petersor]

No change with WiFi disconnected - The jumper is still installed on the LVDS - should I remove that?

The LAN IC (0524P) doesn't have any shorts (except the center pin 3 which is the ground pin . . .

[petersor]

I hooked a 13V power supply up to the main board and measured voltages on the coils - some are steady and some drop to 0 as the board power cycles. . . . The board was not connected to the TV when I took the measurements. Not sure if this is helpful

[petersor]

One other possible clue - The audio amplifier IC (TAS5749M) has a warm, not hot, spot in one corner . . . .that comes and goes as the board powers up and down.

[petersor]

lotas - Anything else I can try on this board or is it unrepairable?

[lotas]

Check with this table (voltage / resistance), the problem may be in the eeprom 24C512 firmware or in the eMMC, maybe in the processor itself, I'll dump dump 25c512 for diagnostics...
Only your dump (24C512) must be saved.

[petersor]

Thanks. I'll take a look tomorrow.

[petersor]

here are the voltage and resistance reading I measured:

[lotas]

The measurements were made without a jumper (no t-con output voltages)?

[petersor]

Correct - no jumper.

[lotas]

It is necessary with a jumper to see the remaining voltages.

[petersor]

OK. I'll add the jumper back and test again. Thanks for your patience.

[petersor]

Voltages and resistances are the same with the jumper in place.

[Diah]

from yours measurement and test with Jumper and with out, it tell you have cut off of the I2C from the SoC. its 99% BGA. need to refllow

[lotas]

What panel do you have, number CY-xxxxxx?

[lotas]

Voltages and resistances are the same with the jumper in place.

This chassis also had problems with the crystal falling off the substrate, remove the radiator and blow on the crystal with a soldering station for 30 seconds at a temperature of 200-250C.

[petersor]

I'll check the panel number when I get back to the house tomorrow. I'll try reflowing the crystals first and if that doesn't help, I'll try the main processor . . .

[petersor]

Panel number is CY-GK050HGAV5H