LG 24MP55HQ no power on

[basskilla]

Hi there!

I looking for LG 24MP55HQ schematic,or some advice.
Unfortunately the monitor not power on at all.

EAX65543101 the board number.

Thank You for Your help!

Best wishes!

[rddube]

Re: LG 24MP55HQ no power on

Would need nice clear photos of power board, with good lighting. Both sides.

[budm]

Re: LG 24MP55HQ no power on

https://www.badcaps.net/forum/attach...1&d=1519775312
What DC Voltage do get between the two legs of the filter cap (one with 58, 35V printed on top) right next to the DC Input jack?
The AC adapter power supply is OK, right?

[basskilla]

Re: LG 24MP55HQ no power on

I have one universal adapter with 19V,I measured 19V between the two legs of 58, 35V capacitor.
I also felt lot of heat from middle IC with 24MP55HQ sticker,and I switched off the adapter.

[budm]

Re: LG 24MP55HQ no power on

OK, that means the board is getting power, just want to make sure.
I cannot really see any Voltage test points on that board to help us to see if we at least have the correct Voltages or not.
I am sure it has to have some kind of Buck converter circuit to drop that incoming 19VDC down to lower Voltages to run the board.
I see two round inductors which I think they may be for the buck converter circuits.
BTW, there is not LED indicator at all at this points?
Also check the DC Voltage between the two legs the 33/100V cap to see what you have.

[sellit]

Re: LG 24MP55HQ no power on

I have the same problem with the same board. Middle IC super hot (Novatek NT68771HUMFG)

[Andrew F. Ali]

Re: LG 24MP55HQ no power on

I would remove this IC and check the PCB for shots from the pads. If no shorts are found I would go ahead and replace that IC and see what happens.

[Andrey P.]

Re: LG 24MP55HQ no power on

Hi!!
need a circuit diagram.
backlight problem, when a signal is input, the lower half of the backlight goes out, on Q101 and Q102, the input voltage drops to 52V, and the output goes to 39v.
can anyone come across such a problem?
voltage at connector P102
1 -39.9V
2 -39.9V
5 -57.3V
6 -57.3V