Hi
I've found lot of help here with already answered questions, but it seems I'm in a different case.
My LG 55EA970V OLED screen from 2013 was working well and stopped suddenly while in use, with black screen / no more audio. This model is quite unusual here in europe, so I didn't manage to find someone to help (tv shops etc).
I've already checked the following :
I thought the main board was faulty, so I ordered a (used) one from a China supplier, but the result are the same (first PWR_ON, then no DRV_ON).
I had chance to also get another power supply board, so I've changed it too ... with the very same results.
I've followed part of the SMPS test document, but I can understand what component can be faulty. Is it possible that as the TCON remains unpowered, the main board considered it as faulty and turned into a "fail" state, refusing to start ?
While I can change the TCON too, I can't understand why the DRV_ON remains off.
I've also tried to plug a USB key with a small led indicator, thinking it may light up if the main board boots. But whichever port I use, the key remains off. So I guess the main board (old one or replaced one) does not boot.
I've noticed 2 little switchs on main board. The first seems to power off the device, but I can't find any doc regarding the purpose of these. I can't see any led on the boards, I don't know if there is one supposed to blink / light up.
I'm not quite sure about the "no sound" assertion as the TV was setup with external amp (through) ARC, so the embedded speakers may be disabled.
Will much appreciate any help from electronic warriors here !
I've found lot of help here with already answered questions, but it seems I'm in a different case.
My LG 55EA970V OLED screen from 2013 was working well and stopped suddenly while in use, with black screen / no more audio. This model is quite unusual here in europe, so I didn't manage to find someone to help (tv shops etc).
I've already checked the following :
- power supply out voltage is fine at 3.5v 12v and 24v pins on the main P202 connector (picture attached)
- when powered on by remote I can hear the relay "click", the LG logo lights on, then the PWR_ON pin switch to 3.5v at P202 connector (picture attached), but no screen display (and no sound)
- the DRV_ON pin remains at 0, so there is no 20 volts at the bottom connector (P201)
I thought the main board was faulty, so I ordered a (used) one from a China supplier, but the result are the same (first PWR_ON, then no DRV_ON).
I had chance to also get another power supply board, so I've changed it too ... with the very same results.
I've followed part of the SMPS test document, but I can understand what component can be faulty. Is it possible that as the TCON remains unpowered, the main board considered it as faulty and turned into a "fail" state, refusing to start ?
While I can change the TCON too, I can't understand why the DRV_ON remains off.
I've also tried to plug a USB key with a small led indicator, thinking it may light up if the main board boots. But whichever port I use, the key remains off. So I guess the main board (old one or replaced one) does not boot.
I've noticed 2 little switchs on main board. The first seems to power off the device, but I can't find any doc regarding the purpose of these. I can't see any led on the boards, I don't know if there is one supposed to blink / light up.
I'm not quite sure about the "no sound" assertion as the TV was setup with external amp (through) ARC, so the embedded speakers may be disabled.
Will much appreciate any help from electronic warriors here !
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