Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
Ok, I aslo did this mod; lift pin 28 of ch341 and jumper to 3.3V tab of regulator and also jumper to pin 9 of ch341. Should i have done this? I'm reading information now that says it was wrong to do that.
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
See in neo programmer, with SPI Flash removed and just the CH341 plugged in, it says cannot connect to CH341 and I don't know why.Attached FilesLeave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
Same message with spi flash removed. No connect. I want know if the CH341 is configured properly....do i need to use the jumper? There are no instructionsLeave a comment:
-
Leave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
The program does not see your programmer, if the chip is short, as I already wrote, then it shortens the power supply of the programmer, remove the chip and start the program again.Attached FilesLeave a comment:
-
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
Ok, excellent, now you can experiment with the old one, looks like these guys have lots of suggestions for further testing.Leave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
So, did you order the new spi? looks like the quicker you get a new one the quicker you can get on with the repair attempt.Last edited by nomoresonys; 04-19-2023, 02:04 PM.Leave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
use this auto detect
or this in attachment... GIGADEVICE your chipLast edited by Diah; 04-19-2023, 01:12 PM.Leave a comment:
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
I got the CH341 programmer, did the 3.3V mod and soldered the SPI Flash to the daughter board. I downloaded and installed the drivers for the CH341. I tried using Neo Programmer software but GD25B32CSIG was not in their list and auto detect did not work.
Does anybody have a suggestion of what program to use with the CH341?Leave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
you need to find out PIN 5 DT602 where its go.. from photo cant follow it because the boards sandwich one. if it goes to cap you need to do check of it same way in reserve to find out the slow discharge.Leave a comment:
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
I found the SPI Flash, so will try to check with programmer tomorrow.Leave a comment:
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
See attached....Attached FilesLeave a comment:
-
-
Re: Samsung QN75Q60TAF Boot Loop fixed but no picture
i think i write before.. ""right now MB after remove IC601 boot correct BL okay...Sound OK and we should not back consider right now on MB""... it logic talk that after this test point our focus will be on Panel but as SOLO because this is measurements of Diode mode and R so we don't need MB interface with any reading.Leave a comment:
-
-
Hi Team - just joined to see if anyone can offer some expertise in diagnosing an issue with a TV.
I've done a few hours googling and youtubing but just seeing if anyone has any insight here. I got a 55" Samsung UE55MU6470U which seems to boot loop and then after 10 mins will boot, work for a few minutes, then turn off and repeat.
Whilst it's on into the normal Samsung menu/boot screen it looks perfect - so I can't see there being any screen issues. I've seen lots of videos with taping across clock lines to diagnose which particular one may be an issue but i don't... -
Hi, I rescued a Samsung UN40H5003AF (H = 2014 FHD) from the curb. Symptoms are: standby (red) light comes on, stays on for 8 seconds, flickers off, then comes back on, and the cycle continues.
Service manual: https://www.electronica-pt.com/esque...is-u8la-71272/
SMPS board: checked voltages, all seem normal (A13V = 12.8V, UD = 3.3V, PWM_BLU = 0.77V, PS_OnOff = 5.5V). Remove 10p cable to main board -> backlight comes on. I think this means SMPS board and backlight are good.
Main board: BN94-07592P / BN97-08922R... -
Hello,
My Samsung TV had a black patch on the left side of the screen for a while. One night it shut off and then became stuck in a boot loop. I initially believed the back-light was the issue and replaced the LEDs but it still boot loops. I've since replaced the main board and the issue persists.
With the main board unplugged, it powers on and the back-light comes on. I've tried the tape method but I gave up as I don't know what pins I need to cover.
I suspect the panel itself it broken but have no multi-meter to test. Is it worth investing in one to test?... -
Have a Samsung UN50NU7400 which shows a boot screen and a screen saver if left on long enough but no picture ?
Would a moving screen saver confirm that the panel is ok or it could still be a panel issue ? -
Hi I need help with a Samsung un43nu7100 BN94-13191C/BN41-02635A with boot loop problem even with tcon jumper.
I've already try tape method and same happen, if I disconnect both flex from mainboard to panel tv boots normal even I hear Samsung sound.
When I solder jumper to make t-con work with or without panel or panel cables connected it still reboot or power cycling.
What I noticed is that there's no voltage in VHG, HAVDD, PANEL_3.3V, AVDD_17V or 12v near dc-dc chip.
I check capacitors and diodes and didn't find any short IN MAINBOARD.
Measured all power supply...
Leave a comment: