HiSense 65H6510G no boot

[nomoresonys]

Re: HiSense 65H6510G no boot

Maybe try the powerboard as stand alone and see if you get steady voltages and backlights on.

[Diah]

Re: HiSense 65H6510G no boot

if you are sure MB disconnected and this is the value u have,,, then you have one Optokoppler between primary and secondary PWB defect

[howardc64]

Re: HiSense 65H6510G no boot

disconnect the MB from socket XP810 and tested the voltage you have on it and on the LED BL socket with references to TV chassis

XP810 disconnected from main

BSW BRI 0v
18/12v = 20v
all 12v = 9.4v

BL Connector (volt meter - on chassis)

Connected to backlight

blue and red = 190v when plug in AC and continuously dropping
white and black = 120v when plug in AC and continuously dropping

Disconnected from backlight

blue and red = 190v when plug in AC and continuously dropping
white and black = < 10v and continuously dropping

[Diah]

Re: HiSense 65H6510G no boot

disconnect the MB from socket XP810 and tested the voltage you have on it and on the LED BL socket with references to TV chassis

[howardc64]

Re: HiSense 65H6510G no boot

yours photo remark voltage[/URL] i cant understand from it any point.. as its out of my poor English knowledge.. sorry

4 pins on PSU LED connector. Presumably 2 serial circuits.

blue
white
red
black

volt meter ground probe on chassis

blue = 195v
white = 124v
red = 195v
black = 124v

meter + on blue, meter - on white = 0v
meter + on red, meter - on black = 0v

These voltage reading starts when plugging in AC cord and never change with pressing TV power button.

LED tester + on blue and - on white light up LED and reads 79.2v
LED tester + on red and - on black light up LED and reads 79.2v

I only use shopjimmy reference to see # of LEDs. Of course it may not be exact to whats in the TV. To see whats in the TV require a lot more disassembly.

[Diah]

Re: HiSense 65H6510G no boot

you are still diving at wrong ocean
if you work on what SJ write and advertised then no need to post over here.... they sell parts not to diagnose issue..
yours photo remark voltage i cant understand from it any point.. as its out of my poor English knowledge.. sorry

[howardc64]

Re: HiSense 65H6510G no boot

you are diving at wrong ocean...
lets go back to original issue while all in original connecting.. give read of the socket which goes to main-boards and LED socket high and low at first start

Don't know if BSW is turning backlight on but < 1v after plugging in AC and no change pressing power switch on TV. Anyway, none of the main connector voltages change pressing power button on the TV (not remote)

Shopjimmy shows 10 strips of 6 LEDs so LED tester shows 10v below 90v assuming 3v LEDs.

https://www.shopjimmy.com/hisense-lb...ght-strips-10/

googling HiSense standby light blinking codes shows 2 blinks = bad LED. Anyway, I have no standby light at all (briefly flash after plugging in AC) So most signs seems to point to dead main

[Diah]

Re: HiSense 65H6510G no boot

you are diving at wrong ocean...
lets go back to original issue while all in original connecting.. give read of the socket which goes to main-boards and LED socket high and low at first start

[howardc64]

TV standby light flash once after plug-in AC power. Then silent. No backlight, no LCD image on flash light test, no SPDIF light.



All PSU voltages to main looks good (12v, 20v (label says 18v but is 20), standby voltage) Probing main board shows what appears to be a DCDC converter (MSH6103A can't find datasheet) providing 5v, 3.3v and 1v. 5v present to the standby light power switch board.



These HiSense TVs appears to have lots of firmware corruptions that takes out the main board either through smartTV use or firmware update. Used main board prices are quite high probably due to so many main boards failing from poor firmware. Since I only get 1 blink on the standby light, probably even basic boot firmware has corrupted (>1 blinks will indicate some failure status)

Main SOC is a MStar msd6886NQHT (MStar bought out by MediaTek in 2019 according to Phillips lawsuit docs in US ITC court filing link p48 )

Found this 2018 service guide for MSD5886 showing UART access to the TV to flash various boot/firmware bits

https://www.manualslib.com/manual/16...roduct-MSD6886

p28 shows a serial port connection to the earphone port. My TV has both an earphone and service port (also earphone plug shape) right next to it. Service port plug solder points appears to show its just a TRS 3.5mm plug port



https://www.headphonesty.com/2019/04...uctor_plug_TRS

Looks pretty easy to make the DB9 to TRS 3.5mm cable (pin 2/3/5) and can buy these off the shelf programming cables

https://www.youtube.com/watch?v=4riU...elliteTrackers

Then its onto finding software and this TV's boot/firmware bits.

Flashing in boot/firmware via serial ports is pretty standard Android flashing process. Recently did this on my Chinese Android HeadUnit for the car. Just need the cable, Flashing firmware (usually from main SOC maker) and trigger SOC to reset.

Anyone has experience with this? Also probably unlikely to get boot/firmware bits from HiSense so probably need a flash in a raw dump?

I'll try heating the main SOC slightly to see if any help but given the % of firmware failures on this TV, corruption boot/firmware seems the most likely candidate.