User Profile

unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 08:43 AM
I found [URL="https://www.ti.com/lit/ds/symlink/tlv9062.pdf?ts=1728476487361&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLV9062"]this one[/URL] based on the TLV9062 at my local distributor.
[ATTACH]n3612922[/ATTACH]I found [URL="https://www.ti.com/lit/ds/symlink/tlv9062.pdf?ts=1728476487361&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLV9062"]this one[/URL] based on the TLV9062 at my local distributor.
[ATTACH]n3612922[/ATTACH]I found [URL="https://www.ti.com/lit/ds/symlink/tlv9062.pdf?ts=1728476487361&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLV9062"]this...

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 08:07 AM
Is any of these are sufficient replacement?

[url]https://eu.mouser.com/c/semiconductors/amplifier-ics/operational-amplifiers-op-amps/?gbp%20-%20gain%20bandwidth%20product=10%20MHz&number%20of%20channels=2%20Channel&package%20%2F%20case=SOIC-8&supply%20voltage%20-%20max=5.5%20V&supply%20voltage%20-%20min=2.4%20V[/url]https://Is any of these are sufficie...ckage%20%2F%20...

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 07:16 AM
Yes it is....

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 06:48 AM
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612830}[/ATTACH]

I hope this clear enough....

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 06:20 AM
R170, the one missing between the cap and the resistor.

I can measure 140kohm on it, but since it let out magick smoke, the resistance of it might changed.

I couldn't find the exact IC on any supplier sadly, maybe using something else with similar attributes could work?...

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 04:01 AM
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612722}[/ATTACH]
As far as I can see, it's part of the backlight. I desoldered the IC to measure it's pins outside of the circuit and indeed the GND leg has 56ohm resistance to all other leg on it....

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-11-2025, 02:52 AM
I found the [URL="https://www.lcsc.com/datasheet/lcsc_datasheet_2411121111_DIOO-DIO2072SO8_C444544.pdf"]schematic[/URL] of the IC.

Also turned out that the burned component is a resistor. I removed it from the circuit and I measure low resistance (53ohm) to ground on all of the non-GND pins of the IC.
Could this be the issue?I found the [URL="https://www.lcsc.com/datasheet/lcsc_datasheet_2411121111_DIOO-DIO2072SO8_C444544.pdf"]schematic[/URL] of the IC.

Also turned out that the burned component is a resistor. I removed it from the circuit and

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-10-2025, 09:30 AM
Yes, you are right, I measure 170-200V on the discharge pins while the backlight is trying to stabilise.

Also I found something suspicious:
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612173}[/ATTACH]
This small ceramic cap is next to the IC marked DI02072 which is right next to the backlight connector.Yes, you are right, I measure 170-200V on the discharge pins while the backlight is trying to stabilise.

Also I found something suspicious:
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612173}[/ATTACH]...

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-10-2025, 08:49 AM
I proceed to check the capacity (I don't have an ESR meter at hand sadly).
With the jumper on and the panel disconnected, the backlight stayed on for a long 2 minutes, at high brigthness. The tv responded to my remote commands, bleeping with menu sounds, then it went into restarting again. The difference is that the backlight had much higher brightness and it the tv were stable for 2 minutes instead of a few seconds.

Also, no short on the signal lines you mentioned....

See more | Go to post

Last edited by unimatrix93; 04-10-2025, 08:55 AM.
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-10-2025, 08:17 AM
393V on both standby and operating mode.
[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3612133}[/ATTACH]

CX8015 - 0v
CX8025 -0V
CP8015 275V
CM816 - 10.43V
CM813 - 20V
CM862 - 218V
CM853 - 12V
C9105 - 13V
C9101C - 197V393V on both standby and operating mode.
[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3612133}[/ATTACH]

CX8015 - 0v
CX8025 -0V
CP8015...

See more | Go to post

Last edited by unimatrix93; 04-10-2025, 08:42 AM. Reason: Added more measurements and photo of board
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-10-2025, 07:01 AM
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612021}[/ATTACH]
I did some measurements based on the photo you made.
I also made the jumper where you showed.
Since my board looks different, I don't know where is the middle capacitor is on my board.
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3612022}[/ATTACH]...

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-10-2025, 01:35 AM
Ah so this is the power supply of the SoC. Now it makes sense.

Any idea what could cause this issue?
I measuring fluctuating voltages on the backlight.
The board specifies 112V for 55' model like mine, but I measure 123V on it while its working and when it flashes and shuts down, I measure 80V then it quickly climbs up to 150V, then goes back to 123V while working again for a couple of seconds....

See more | Go to post
Leave a comment:
unimatrix93 replied to SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-09-2025, 02:41 AM
So I did some measurements on the mainboard and noticed that I have a low resistance to ground (38ohm) on L88.
The test point is marked BV097_PW2.
I measure 0.90V on it during startup.
The Ic next to it is a [URL="https://www.alldatasheet.net/datasheet-pdf/view-marking/1424933/AOSMD/AOZ2255LQI-30.html"]A0Z2255LQI[/URL] DC/DC buck regulator and the inductor is connected to the LX pins of it.

The IC has 12V VCC, which is supplied properly.

Is this working properly or something is off?
[ATTACH=JSON]{"data-align":"none&quo...

See more | Go to post

Last edited by unimatrix93; 04-09-2025, 02:51 AM.
Leave a comment:
unimatrix93 started a topic SAMSUNG UE55TU7002KXXH rebooting

in Troubleshooting TVs and Video Sources

04-07-2025, 09:49 AM
SAMSUNG UE55TU7002KXXH rebooting

Hello everyone, I'm working on a Samsung TV that constantly rebooting.

MB/PSU unit: BN9654185QE

It loads up to the main menu then as soon as the backlight goes brighter it reboots.

First I suspected the LCD panel, so a disconnected the LCD display from the mainboard but did the same thing.

Then I removed the backlight connector which only delayed the bootloop by a minute maybe, I know it because I test it with the remote, it does gives the menu sounds a bit longer.

Also I have to note, that the MB/PSU combo gives out a very noticible...

See more | Go to post
unimatrix93 replied to Needs SPI dump for 17MB97

in Troubleshooting TVs and Video Sources

04-03-2025, 05:02 AM
Damn.

I bought an another main which was advertised for 39 inch displays. However the 8 character on the sticker is different. Mine is 23340018, the new is 23312214. The new board doesn’t even blink, no stand by led at all.
Can I do anything with this board? Or should I try to send it back to the seller?...

See more | Go to post
Leave a comment:
unimatrix93 replied to Needs SPI dump for 17MB97

in Troubleshooting TVs and Video Sources

04-03-2025, 04:19 AM
Is it possible to extract the SPI's content from this? To directly flash it to the 25L1606E?...

See more | Go to post
Leave a comment:
unimatrix93 replied to Inexive (Vestel) TV constantly blinking after plugging in

in Troubleshooting TVs and Video Sources

04-02-2025, 07:54 AM
I replaced the cap with a new one, capacity is 560, low-ESR.

Same symptom, 5V in missing. only 12v and 3.3v PWM....

See more | Go to post
Leave a comment:
unimatrix93 replied to Inexive (Vestel) TV constantly blinking after plugging in

in Troubleshooting TVs and Video Sources

04-01-2025, 06:25 AM
Found something weird, based on the schematic R1 should be 4.7Mohm while I measure 7.9Mohm on it removed from the circuit.
[ATTACH]n3605546[/ATTACH]
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3605547}[/ATTACH]Found something weird, based on the schematic R1 should be 4.7Mohm while I measure 7.9Mohm on it removed from the circuit.
[ATTACH]n3605546[/ATTACH]
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3605547}...

See more | Go to post
Leave a comment:
unimatrix93 replied to Inexive (Vestel) TV constantly blinking after plugging in

in Troubleshooting TVs and Video Sources

03-28-2025, 10:18 AM
Yes, it's a typo. Also, I removed the cap from the board and I measure 504uF on it. I ordered a replacement for it, hope that will be the culprit....

See more | Go to post
Leave a comment:
unimatrix93 replied to Inexive (Vestel) TV constantly blinking after plugging in

in Troubleshooting TVs and Video Sources

03-28-2025, 04:14 AM
[URL="https://1drv.ms/v/c/6847a0adfd1c21be/EdFab6w5IkRFlNWqBT95abIBAHGIdiH8xSIaFHQK8JlcwQ?e=Ppz9HZ"]PXL_20250328_101130849.mp4[/URL]

This what I measre on the FAN6300 IC VDD and HV pin - negative probe on the filter cap's negative leg.

[URL="https://1drv.ms/v/c/6847a0adfd1c21be/EdFab6w5IkRFlNWqBT95abIBAHGIdiH8xSIaFHQK8JlcwQ?e=Ppz9HZ"]PXL_20250328_101130849.mp4[/URL]

This what I measre on the FAN6300 IC VDD and HV pin - negative probe on the filter cap's negative leg.

[URL="https://1drv.ms/v/c/6847a0adfd1c21be/EdFab6w5IkRFlNWqBT95abIBAHGIdiH8xSIaFHQK8JlcwQ?e=Ppz9HZ"]PXL_20250328_101130849.mp4[/URL]...

See more | Go to post

Last edited by unimatrix93; 03-28-2025, 04:18 AM. Reason: added onedrive link for video
Leave a comment: