HiSense 65H6510G no boot

[howardc64]

Re: HiSense 65H6510G no boot

no reset... mean there are over load on PSU. it could be BL .. it could be the 12V rail when it go high... or the MB step down circuit over load... there are must be reason.... simple answer move load... let the panel always disconnected from T-CON. wifi BT out from circuit... speaker out... to narrow the cause

Thank you. Just tested again and now have more understanding.

• No PSU overload noise if main is unconnected. If main connected, always ~30 overload noise.
• Overload noise occur with LCD/speaker/IR+LED/wifi all disconnected.
• Overload noise occur EXACTLY when UART terminal shows CPU reboots

So I guess overload is just initial brief main board power up power draw condition?

EDIT: when you run the PSU as stand alone as i described before and there quit and BL on then you know where yours eyes should focused.

I don't understand your suggestion.

There is no backlight when main is disconnected. However, I did jump 3.45V STB to BSW in post #10 and saw backlight flash briefly through the rear chassis holes.

I didn't try to turn on backlight permanently because X810 connect (main<->PSU) has ANA and BRI brightness control signals. Schematic shows both are PWM brightness signals. If these remain 0v, backlight may not come on but I don't know this PSU's design. I guess if I jump these to 2V+, backlight will probably turn on?

====

Anyway, we are gradually understanding all the circuit but eMMC is probably dead haha... I will research any way to flash signed mboot without US HiSense support (useless haha)

[Diah]

Re: HiSense 65H6510G no boot

Thank you. Just tested again and now have more understanding.

There is no backlight when main is disconnected. However, I did jump 3.45V STB to BSW in post #10 and saw backlight flash briefly through the rear chassis holes.

its big mistake to try use MB step down rail 3.5V to power on the BL. while MB connected

you need to make yours own step down circuit to test PSU as stand alone.

or
you should remove ( clip out the wire of BSW & BRI from socket at PSU side ) then use the STB to power on the BL with MB step downloader STB

[howardc64]

Re: HiSense 65H6510G no boot

Read more boot info. Update for future reference

Reference Material

• mboot documentation from 2012 ( link )
  
• MSD6886 Service Manual ( link in post #1 mistyped as MSD5886) schematic

Boot Sequence

• Boot sequence is SBoot (Small Bootloader) -> UBoot (Universal Bootloader) -> MBoot (MStar Bootloader) (mboot doc)
• SBoot flow chart shows initializing basic CPU function, init UART, Init MUI (Memory Unit? Interface?), and prepare for UBoot (mboot doc pg 12)
• UBoot inits more HW, load and jump to kernel... (mboot doc pg 22)
• Config Schematic (MSD6886 service manual p51 bottom center, copied below) shows SOC boots from internal ROM then 1 of 3 external storages. My board is set as EMMC.

UART Output

• AC_ON
• MIU0_DQS-OK
• BIST0-OK
• 02-2L-SM-01-20180913
• eMMC Err:CMD0002 0027

This is likely SBoot executing out of SOC internal ROM. BIST is likely testing memory after MUI (DRAM initialization) and 02-2L-SM-01-20180913 is likely SBoot version #

I believe to boot any further, its necessary to change the eMMC to properly respond to eMMC initialization and attempt to fetch UBoot as the next step. An empty eMMC will error of course but slightly further along the boot process.

MSTV_Tool

• MSTV_Tool is a MStar SOC chip tool. Can manipulate all parts of the SOC
• SBoot flowchart shows MSTV_Tool access is enabled before even enabling UART. Downloaded MSTV_Tool ( link ) but unable to connect so thats the next step (app launch but shows sequence of external exception COFB007E during launches)
• According to MSD6886 service manual, need MSTV_Tool to get Device ID, email HiSense to get a password to unlock the ability to flash MBoot onto eMMC
• MBoot then can upgrade TV software via USB

====

Just an update in case anyone has knowledge on these steps.

[nomoresonys]

Re: HiSense 65H6510G no boot

From what I'm seeing, hisense is using the cheapest eMMC and everything else they come across, the built in apps are junk and just shorten the life of eMMC, wondering if just a universal mainboard would be an easier, maybe better solution for some, otherwise looks like you need a programmer and the ability to replace these chips without burning them up or buy them pre-programmed which may prove a tough find but still have to be very careful replacing, a little video of a guy replacing one. He looks pretty competent, but even so he had to go over it again, I can just imagine all the ways this can go wrong for the average do it yourselfer, I'm confident that you can do it but I bet a lot of folks would mess this up somehow: https://www.youtube.com/watch?v=tP3oUCX2ID0

[howardc64]

Re: HiSense 65H6510G no boot

From what I'm seeing, hisense is using the cheapest eMMC and everything else they come across, the built in apps are junk and just shorten the life of eMMC, wondering if just a universal mainboard would be an easier, maybe better solution for some, otherwise looks like you need a programmer and the ability to replace these chips without burning them up or buy them pre-programmed which may prove a tough find but still have to be very careful replacing, a little video of a guy replacing one. He looks pretty competent, but even so he had to go over it again, I can just imagine all the ways this can go wrong for the average do it yourselfer, I'm confident that you can do it but I bet a lot of folks would mess this up somehow: https://www.youtube.com/watch?v=tP3oUCX2ID0

Thanks for the video. Have a pre-heater but my hot air removal skills seems to take quite a bit longer than the pros in video so more prone to kill parts on removal. In my practice runs, pad lifting seems to be limited to NC pads.

On matching boards, 2021 65R6G (this TV is 2020 65H6510G, a BestBuy special) main board seems close but went through a relayout/relabel of components. Don't know if LCD connector signals are the same. At least both are 68pins. All 12 pixel signal lanes from SOC seems to route to same LCD connector pin area. Can't see a PN on the 65R6G's LCD PMIC to see if matching. WiFi connector shape + pin # different. Anyway, haven't been able to find any clear substitute. This main is RSAG7.820.8831/ROH. OOS everywhere other than a few in Isreal and eastern Europe for $100 and different TV tuner connection than US. But ideally, if a much cheaper and widely available 65R6G main can work for LCD, that'd be the best option for most fixers. It also runs Roku which is one of the best SmartTV UIs.

The 2 other TVs I found with same UART error (EMMC Error CMD0002 0027) are both Androids. I'm guessing a barely interesting to Google Android TV Reference Platform business (before the recent tech layout for speculative and unprofitable businesses) combined with cheap TV brands likely result in naturally poor HW/SW integration/testing thats wearing out these eMMCs as upgrades likely get less and less testing. Don't have much stats, just a guess.

[nomoresonys]

Re: HiSense 65H6510G no boot

Looks like this model is a match to your mainboard, 65H6570F.

[howardc64]

Re: HiSense 65H6510G no boot

Looks like this model is a match to your mainboard, 65H6570F.

Yes, same board, same OOS and few $$$

[nomoresonys]

Re: HiSense 65H6510G no boot

Read something on one of the forums where someone bought a mainboard straight from hisense for 115, but shit that's still too high imo even if it is new.

[Diah]

Re: HiSense 65H6510G no boot

we asked you before to freeze the eMMC LOL

[howardc64]

Re: HiSense 65H6510G no boot

we asked you before to freeze the eMMC LOL

Don't have any so need to wait and order with other repair supplies.

[Diah]

Re: HiSense 65H6510G no boot

Don't have any so need to wait and order with other repair supplies.

hmmm you are good at cents counting

[howardc64]

Re: HiSense 65H6510G no boot

Connect MSTAR_TOOL

Running MSTAR_TOOL but no connection to the SOC.

• MSTAR document says UART is off by default and requiring turning on (TV menu setting) to use with debug tools. Does "off" mean only SOC can't receive UART? or both don't receive and transmit? SOC UART obviously transmitting output to my serial dongle in SBoot.
  
• Does anyone know if MSTAR_TOO app can be used with generic USB<->Serial dongle (Have CH340 and PL2303HXA (A=old version ~2012)) or have to purchase MSTAR USB Debug dongle? I set tool to UART 115200 protocol but seems to not connect.
  
• MSTAR USB Debug dongle usually comes with VGA adapter. For this TV with 3.5mm service port. I assume just connect debug dongle serial TTL GND/RX/TX to 3.5mm jack?

[howardc64]

Re: HiSense 65H6510G no boot

hmmm you are good at cents counting

Freeze spray near me is $25 and of course doesn't provide any permanent fix even if shows eMMC can work temporarily.

I'm considering purchasing RSAG7.820.10315 board (2021 65R6G main board) for < $15 and check if t-con output is compatible. This would be the best solution for other repair efforts if can work. But unknown success of course. PSU, IR/LED/KEY, speaker all seem compatible but at least wifi module+cable is different.

[Diah]

Re: HiSense 65H6510G no boot

try to use MS TV client here are lite and full eMMC function.
after you run exe it will give error.. keep press ok it will start and find yours serial UART

[nomoresonys]

Re: HiSense 65H6510G no boot

I'm not paying that much for freeze spray, I'll do the diy dry ice, lol: https://www.thoughtco.com/how-to-mak...dry-ice-606400

[lotas]

Re: HiSense 65H6510G no boot

try to use MS TV client here are lite and full eMMC function.
after you run exe it will give error.. keep press ok it will start and find yours serial UART

Here is a new good MStar ISP utility with support for : eMMC, NAND, SPI.

[Diah]

Re: HiSense 65H6510G no boot

Here is a new good MStar ISP utility with support for : eMMC, NAND, SPI.

yes indeed... but at end all tools for the Taiwanese Soc pro command via putty or Linux terminal can be done more effectively... the tools just UI screen

[howardc64]

Re: HiSense 65H6510G no boot

try to use MS TV client here are lite and full eMMC function.
after you run exe it will give error.. keep press ok it will start and find yours serial UART

Thanks, tried the same versions in post #63. Unfortunately same unable to properly connect behavior

• Need to click through the external exception COFB007E errors during launch (I assume exe just not finding DLLs for unnecessary debug hardware for older TVs)
• Set to USB Serial COM port. Same 115200 baud, 8 bit, no parity, 1 stop as terminal programs.
• Read Bank tries to read and give UART receive error
• One time saw read bank gradually increase. But the increase was only from SOC printing log/error messages. So clearly, need to stop the SOC from printing as indicated by the MSTAR usage guidelines.

Here is a new good MStar ISP utility with support for : eMMC, NAND, SPI.

Thanks! Was going to search for this utility next

Says can't find HW on first launch (PL2303HXA<->3.5mm service port on COM9) and couldn't do anything in menu of course. All launches after first time just silently quit... Strange.

mstv_tool

• Maybe eMMC failure prevents this from working? Also if any server code has to be loaded on the SOC CPU from eMMC, then can't get that far with eMMC has failed.
  
• Service manual says need to run mstv_tool to get device ID and email for a password to unlock flash eMMC capability. So if can't run this... probably the only solution remain is a eMMC chip programmer (RT809H with a 153FBGA socket)
• mstv_tool has no get Device ID button.
• mstv_tool procedure require stopping the UART in 1 of 3 ways (<<MSTAR>># du in MSTAR mode, 00112233 in Supernova mode, nothing if no UART activity) I guess mstv_tool, terminal, and SOC are just all sharing this serial port so they can not all use the port at same time. Tried entering 00112233 in terminal (even in a self repeating macro in case need to be specific timing on boot), no change, UART keeps on bootloop on eMMC error.
  
• Tested TX pin from USB serial dongle all the way to the bottom metal connection finger of the 3.5mm socket for continuity to ensure able to transmit to the SOC CPU.

i2c utility

• This probably require the special mstv usb debug tool?

===

My main motivation is to find cost effective solution for average DIYers. Purchasing more repair tools and replacing eMMC is probably beyond many DIYers. Will investigate if 2021 HiSense 65" TV main board can be easily compatible.

[nomoresonys]

Re: HiSense 65H6510G no boot

Maybe go to hisense site, they're rather silly, they want you to put in your serial #, before they will let you search for firmware, then see if the firmware they have matches any other models besides those 2, it seems if the firmware is compatible with other models then those boards conceivably could work.

[Diah]

Re: HiSense 65H6510G no boot

[*]Set to USB Serial COM port. Same 115200 baud, 8 bit, no parity, 1 stop as terminal programs.[*]Read Bank tries to read and give UART receive error

baud 115200 are the interface of the PC to have correct log letters. Soc during boot send / read at different baud to communicate with external and internal.
i use CH341A at serial configuration 3.3V level to the pc with same yours baud. i connect it to serial adapter az same 3.3V level and then go to target UART.
any time the Soc changed baud the serial adapter will deal with it and changed as Soc wish , with out effect on CH341A baud connection.