Finally I was wrong and there is sound on the TV.
I checked all the resistances and capacitances on the panel PCB and nothing abnormal (no short circuit, 3 resistance values noted: 0 ohm, 30 ohms and 100 ohms).
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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LG 43UF640V backlight good but black screen and no sound
Good morning.
I have a problem with my LG Smart 43UF640V TV. It starts, the backlight comes on but nothing is displayed on the screen and there is no sound.
I thought it was a TCon problem and ran various tests. If I disconnect one or the other of the cables from the tcon to the panel then the screen is white on the side where the cable is disconnected and black on the other side. If the two cables are disconnected the screen is completely black.
In the 4 configurations I measure exactly the same voltages on the tcon card (model V15 43UHD TM120 Ver0.4) :
[FONT=Calibri]HVDD...Last edited by totof; 04-14-2024, 12:26 AM.
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Hello.
I have just tried now and it works very well now.
Thank you lotas :-)...
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hi, i am looking for the eeprom for my Samsung UE40MU6405 -BN41-02568B / BN94-12398F.
The tv doesn't power on (power led always off). Backlight on when moherboard disconnected.
Non-working dump here.
Thanks...
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Problem solved. It was the motherboard in the TV that was broken, I replaced it with another.
Thanks to everyone who tried to help me :-)
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Re: EU55JS9000T black screen and sound good
Hello.
I was finally able to find another OCB of the same reference for a TV with a broken panel but in fact the problem is exactly the same, the backlight turns off immediately after plugging in the OCB. So my diagnosis was wrong.
So, taking into account the tests that I had already carried out, do you think that it is the motherboard in the TV, the T-Con card, the backlight control card, the power supply card ?
What a gas plant this TV design ;-(
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Re: EU55JS9000T black screen and sound good
I don't have the equipment to do this.
Yes it's a good idea but I haven't found any information on how to do this. I would like more details on the procedure for doing this....
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Re: EU55JS9000T black screen and sound good
Okay but I don't know how to flash eMMC. Never do that :-)
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Re: EU55JS9000T black screen and sound good
I just tried with these binaries but it's no better, I don't even have the sound from the TV anymore.
Thanks anyway...
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Re: EU55JS9000T black screen and sound good
Thank you lotas, I will try tomorrow
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Re: EU55JS9000T black screen and sound good
I have already checked the continuity of all the signals with a multimeter with the cable plugged in.
No problems detected
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Re: EU55JS9000T black screen and sound good
Yes there is also a EEPROM on the OCB board and a SPI on the TV mainboard.
Here are the dumps of these CI.
A lot of 00 on the mainboard TV SPI....
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Re: EU55JS9000T black screen and sound good
Here is the dump of the SPI flash of the OCB card.
Maybe one day it will be useful to someone on this forum....
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Re: EU55JS9000T black screen and sound good
I can extract the contents of the spi but personally I won't know how to do anything with it
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Re: EU55JS9000T black screen and sound good
No it's not solved (unfortunately)
The TV works well, I can hear the sound from the TV (TNT tuner source). The sound comes about 10 seconds after plugging in the OCB cable.
So I don't think it's a firmware issue....
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