LG 27up600-w

[phantom1]

hello everyone looking for a schematic for this lg 27up600-w
main board is not working correctly no power up no light on button its just dead power supply is ok 19+ vdc and load at 2amps is holding as well not much in this unit just the main board has its power supply intergraded any help would be appreciated no signs of burning cant find any heat spots checked with flir
thinking missing voltage somewhere this thing was new and just not used last worked before it was put up and now not work as i was told but of course that's what i was told thanks again for any info I am trying to give this to someone in need of a monitor will include a picture and board number
EAX69564001 (1.3)

[CONCRETEGOD101]

Re: LG 27up600-w

Did you find any more information on this? I have two of these monitors not working.

[Sniglet]

Re: LG 27up600-w

Sign me up as having the same monitor with the same outcome.

Haven't dug into the power flow no the controller board as that's a little outside my wheelhouse and comfort zone, but BigClive.com has me thinking hard about it.

[patcap96]

Re: LG 27up600-w

Also have two bad boards. Swapped board with known working panel and all was good. Any help will be greatly appreciated.

[jnatran]

Re: LG 27up600-w

Unfortunately, LG messed up this monitor real bad, I believe they accidentally shorted the 5V bus and 3.3V bus together causing all of the chips designed to run at 3.3V to run at 5V, which is well over their absolute maximum limits. The first chip fried for me was the audio output chip, so one day I suddenly got no audio. The second one fried was the main chip RTD2595LT. This is game over when I no longer can power on the monitor.

If you trace the board, you'll see R155 and R156 right next to the buzzer. R155 is connected to the buzzer and 3.3V bus. R156 is connected to the buzzer and 5V bus. I think these registers were meant to be something large, like probably 1K or higher so the buzzer could be powered by either 5V or 3.3V, but if you measure them, they are basically 0 thus shorting the 3.3V and 5V bus together.

Depend on how your board failed, you might get lucky and only the flash chip fry, which you could buy a new one for like a dollar and reprogram it. But chances are even if you remove one of the register above to disconnect the two buses, the damage is already done to the main chip like my board where it can no longer generate the clock to the flash chip at boot up at 3.3V. This board can still work if let run at 5V, but it won't last for sure.

So check the clock line on the flash chip IC202 pin 6, if it stay solid 3.3V when you connect power, then it's game over. If it toggles and the board will not boot, then you might have a chance. Try to reprogram the chip with the firmware I attached.

[Roberto Ramirez]

Hello everyone, excuse my bad English, I hope you can understand everything I'm about to write.

Approximately two months ago I acquired a monitor of this CIB model with the problem that it did not turn on, I did not know about the issue that this model became infamous some time after purchasing it, fortunately I only paid 50 USD for it, I assumed the risk that I could repair it now I am dedicated to repairing electronics (currently in the topic of microwave antennas, Ubiquiti, Mikoritk, etc...) the issue is that after a couple of weeks of searching in the forums (here) I realized that this model in particular usually fails shortly after working, after several hours of diagnosis I found the failure of the damaged RTD25 5LT, it had the same symptom as those mentioned here, it did not turn on but it did supply the 19V , I tried changing the Flash and reprogramming it with the file from my friend up here, thank you so much for taking the trouble to upload it, unfortunately it didn't work, apparently it wasn't the flash chip since making comparisons with the file that was here with the one that was created when reading the original chip They were exactly the same, board EAX69564001 (1.3)

Looking for information on the main chipset (RTD) I found absolutely nothing, neither datasheet nor any type of information on this CPU.
I found the supplier where we acquired the components to repair the antennas that I mentioned where I do my work, make the purchase through Aliexpress, only pay 10USD for it with priority shipping already installing the new chip with the help of the machine of reballing and a lot of patience I MANAGED TO RESCUE IT, now I have a fully functional monitor with 0 hours of use, I can share the seller, I contacted him via WhatsApp and they send a business card where the contact comes every time we acquire components there

Now I have a spare part inside the monitor in case it is damaged again in the future, there is the spare part of the already recorded flash and the new CPU to reinstall new components

I can share the contact's QR so they can purchase the RTD component directly with them