Re: A1466 (820-00165) No Chime, No POST

I already found 2 SPI ROM files in rossmangroup & this forum.

The CPU probably needs a go signal from the PCH after it has POSTed to set the CPU VCore. Maybe that is why I'm still on 1.7v.

I can't justify a purchase of 100Mhz Oscilloscope, so I'm gonna stick with my cheapo one. No need to decode the SPI data, just knowing that there is activity is fine with me.

My CH341A isn't here yet, so I'll probably put a hold on this repair. I'll update you guys for any changes. Or if you get any idea on which...

Re: A1466 (820-00165) No Chime, No POST

I'll try to flash the SPI ROM with the CH341 and WSON8 adapter first. And maybe, verify the flash multiple times. I don't want to buy the J6100 connector as I don't regularly repair macbooks. Do you happen to have a link for a known good dump for 820-00165? I've got the "2017 clean ME - fixed.bin" and "820-00165-A clean ME.bin" floating around the net. Are they good though?

Thanks for clarifying the Power Sequence more to me. That link helped a lot. Regarding the SVID information, does it pull Voltage IDs from...

Re: A1466 (820-00165) No Chime, No POST

Hello!

Thanks for answering back. There was no liquid damage on the board. One night it was turned off. The next day it won't turn back on. That's it. Visual check reveals nothing at all. No corrosion.

SPI ROM is next on my list. I'm still waiting for my CH341A, it should arrive by tomorrow. I'm currently watching your Instructional Videos regarding Clean ME & Change SSN. You're the man! Would it be possible to flash SPI ROM In-Circuit (Test Points)? If not, I'll just remove U6100 and put jumper wires in place....

Good Day!

History:
The board was not booting, upon opening it the fan was spinning but there is no PPVCC_S0_CPU. PP1V05_S0 was 0.550v. PP1V05_S0 Diode Mode = 0.007v , Resistance = 3.4ohm. ALL_SYS_PWRGD = 3.340v. I suspected it was a short on the PP1V05_S0, so I lifted L7630 and found the 3.4ohm short on the Load Side. I injected 1v on the rail and it was only taking 34mA. After this I returned L7630 and investigated the U7600 (TPS51916). It has VREF (1.8v) and REFIN pins. And sure enough, the REFIN voltage is just 0.550v. That is why there is ALL_SYS_PWRGD, because it thinks...

Re: Samsung UN55B6000 Relay Clicking



I had the same problem as you. I replaced all the Capacitors on the Power Supply Board, but this didn't solve the clicking problem.

I tried shorting the pins 5 & 6 on the EEPROMs during startup, same thing as above.

I got another board which is for a UN55B8000. This board still clicked the relay but at least the Power LED is blinking. Upon closer inspection, the board had 40 of its SMD Resistors/Capacitors cracked/removed. So I de-soldered these components from my old UA46B6000 board and re-soldered...

Re: Samsung UN55B6000 Relay Clicking

Thanks for your reply.

I kept on trying the EEPROM reset procedure (short pins 5 & 6) but it still won't start. I tried measuring the voltage regulators and it looks like IC210 output is being pulled to GND. I traced it and it looks like the Tweeter Amplifier IC (STA339BWS) is shorted as it gets dangerously hot. I don't have tools to remove this IC, so I had to order a replacement mainboard.

The replacement mainboard however was still not working and upon closer inspection, there are 32 Capacitors, 6 Resistors and...

Re: Samsung UN55B6000 Relay Clicking

I have the exact same model and was killed by a power surge. I replaced the capacitors in the power board but the TV is stuck on Standby(?). The LED light just keeps on blinking and the relay clicks every 10sec or so.

I read that you need to reset the EEPROM since they can get corrupted after power failure, but there are 3 possible ICs and I don't want to risk any more damage by trying each one.

Which one is the EEPROM?

IC1201 (below the HDMI Switch)
IC901 (above SoC and beside RAM)
IC1603 (on...