LG 27GL63T-B completely dead

[Dannyx]

How much was this ? I'm just curious if it's a viable option to fixing one of these (IF it works, that is). If it ends up costing half the price of a replacement board, factoring in the effort required to replace it, I'd say it's not worth it, especially since this is the second board that dies on me (or HIM, since it's my friend's )...

[Pandor]

Its finally here. At first glance, it looks fake (comparing the logo), but anyway. Wasn't aware this chip would have a bottom ground plane, so that's going to be a p.i.t.a. i'm not overly confident. I've done bga cpu's, but qfp chips don't tend to just flow in place under hot air... we'll see.

[lotas]

My monitor has crapped out also and I'm gonna take a stab at fixing it. I found the info for IC 401 but cant find the part number for IC402 in this thread. I see markismus' photos for ic labels but cant find the datasheets in his post. Anyway if anyone has the part number or a link to the part i need for IC402 IACGK that would be great!

ACGx - MP24894GJ

https://aliexpress.com/item/1005004986588777.html

[Dirk Basford]

markismus posted some great pictures with correct IC labels and datasheets, one page back.

My monitor has crapped out also and I'm gonna take a stab at fixing it. I found the info for IC 401 but cant find the part number for IC402 in this thread. I see markismus' photos for ic labels but cant find the datasheets in his post. Anyway if anyone has the part number or a link to the part i need for IC402 IACGK that would be great!

[voveo]

So, if I understand correctly. The low resistance on the memory power supply was not the issue? The low resistance measures the same on the new CPU? But replacing the CPU revived the screen? I'm currently waiting on my replacement MST9U35Q1 from aliexpress.

Hello, sorry, I’m writing through a translator, the burned-out processor had 39 ohms when it was installed and 39 ohms when I dismantled it, on the new processor kilo-ohms

[Pandor]

Hello everyone, I'm sorry, I bought the processor on Taobao, I made the order to Germany through Ukraine, on the non-working processor there was a resistance of 39 ohms, on the removed processor the same 39 ohms were on the 106-107 leg, on the installed new processor and kilo-ohm PWM controller, https://ua-tao.com/ua/item/749397100...RfcHJpY2UiOjB9 https://item.taobao.com/item.htm?spm...cket=15#detail

So, if I understand correctly. The low resistance on the memory power supply was not the issue? The low resistance measures the same on the new CPU? But replacing the CPU revived the screen? I'm currently waiting on my replacement MST9U35Q1 from aliexpress.

[voveo]

Hello everyone, I'm sorry, I bought the processor on Taobao, I made the order to Germany through Ukraine, on the non-working processor there was a resistance of 39 ohms, on the removed processor the same 39 ohms were on the 106-107 leg, on the installed new processor and kilo-ohm PWM controller, https://ua-tao.com/ua/item/749397100...RfcHJpY2UiOjB9 https://item.taobao.com/item.htm?spm...cket=15#detail

[Pandor]

Hello everyone, there was low resistance on the memory power supply pin on the processor, I ordered the processor from Alibaba and the PWM controller, I replaced it, everything works

I'm afraid my problem is also the cpu. Do you have any resistance measurements with the new cpu?

markismus this should work: https://a.aliexpress.com/_EuyUHWv

[markismus]

voveo Could you post links to your ordered ic's?

[voveo]

Hello everyone, there was low resistance on the memory power supply pin on the processor, I ordered the processor from Alibaba and the PWM controller, I replaced it, everything works

[falkikowski]

I think the locations of the external connectors are not the problem. New openings in the shell can be made and the old opening can be closed with 3d printed caps.

But from what I saw on eBay listings the lvds connector to the panel seem to have different pin amounts and different connectors.
Even if the pin amount is correct I'm not sure how well the connector can by adapted.

Often the other board are layout for eDP and LVDS 41 pin and 51 pin, but not all connectors are soldered onto the board. And often the boards have FFC or FPC connectors. I'm not sure what connector is on our boards, maybe the JAE FI-E.

[alex1918]

Compatible with my monitor. Connector locations are different https://60.img.avito.st/image/1/1.r0...ePXQmQIR8-yrVU
https://60.img.avito.st/image/1/1.BX...JP1LefPFcHN_5A

[Vesko356]

This is an english language forum, post in English please!

[alex1918]

Приветствую.скажите с кой модели может подойти плата .точно подойдет LG 27GN750 .может еще есть

Greetings. Tell me is there any other model that has the same board? The LG 27GN750 will definitely fit. Maybe there's more?

[Pandor]

Pandor How did you know how to wire it up? Couldn't find anything in the 29gl850 service manual. A logic analyzer is new to me. Nice! But at least I would understand how you got the pinout.

The 27gl850 service manual posted on the first page is virtually identical, minus the USB and buzzer stuff. most of the schematic matches the 27GL650 board we have. I've been using it as a reference.
Here's the UART part:

[falkikowski]

Hi,
I find the service manual for the 24GL600 quite helpful. The naming is not 100% correct but the voltages seem to match.

I swapped the IC401 and the 12 MHz quartz and getting the right voltages on that coils, but I get no high signal on the pin 2 of the LED driver IC.

Do you think it is possible to check the IC200 and reflash it?
Or is it alternatively possible to get a hole new board that just works with that panel?

[markismus]

Pandor How did you know how to wire it up? Couldn't find anything in the 29gl850 service manual. A logic analyzer is new to me. Nice! But at least I would understand how you got the pinout.

[Pandor]

I hooked up my USB to TTL adapter, and no output at all. I could hook up my logic analyzer, but this is getting nowhere... I'm getting fed up with this LG cr*p. I feel like just taking the loss and tossing it.

[Pandor]

markismus you're correct about the IC600 function, but it is creating the +5V_STANDBY (pin16, going to L601), so in my humble opinion, that would/should be enough for just standby. No leds should be driven when the screen is off/standby, so I'm not convinced. iI doesn't seem to have any other purpose. Just as IC402's 12v is only needed if the panel is powered on (driven by the "PANEL_ON" pin from the CPU). What is interesting, is that i have 3.3v on the joystick/led connector, and normally the CPU also drives the standby led through its "CONTROL_LED" pin (Q204 near the connector), yet, no standby led... so a CPU problem?

I tink i'll desolder the serial connector, hook up some wires, and see if I get anything on the 3.3v TTL UART output. Or I'll just flame torch this board..

Sidenote: hooking up a USB to serial always confuses me... What does the silkscreen on the adapter actually mean? "This is my RX" or "the other device's RX goes here"???

[markismus]

Pandor Well, the IC600 is a buck converter and LED driver, so if that one is broken, we would also be seeing no response. But it does seem that we narrowed it down to IC600 and CPU.
If we could connect to header P200 with TTL we could see whether the CPU is responding.
Still have to reread the datasheet for the voltages and pins on the IC600 to see how I can test it. That one is cheap, though.