Re: Power supply troubleshooting on LG W3000h-bn

Wasn't able to get the fuse locally, so might take a few weeks to receive it. I'll definitely let you know how it turns out, and if it works I'll check some more the 3.4V as you suggested.

Re: Power supply troubleshooting on LG W3000h-bn

Thanks momaka, finally have some time to work on this again.

I plugged just the main board through my DVI cable in the video card and I can confirm that the computer properly recognizes it and reads the EDID. The DVI pins for Hot Plug Detect and 5V standby from PC also seem good with ~5V on them when plugged.

The diode D316: IN734 B3 4 "Zener voltage regulator diode"; forward biased: 0.16V drop, reverse biased: OL. (seems ok?)

I didn't remove any components yet and I only have...

Re: Power supply troubleshooting on LG W3000h-bn

Indeed. Here they are....

Re: Power supply troubleshooting on LG W3000h-bn

Ok, I'm running out of options, but if there's a way to fix this, I would really appreciate the help. I'm still going with the assumption that the problem is the main board. After some back and forth on the phone with LG and the local LG repair shop, LG gave me the part number (which apparently is not the one written on the part): EBR41359301.
I was very excited to find a few online stores sold it (without any description though so couldn't confirm it was the right part). But after ordering it and waiting 3 weeks, they finally...

Re: Power supply troubleshooting on LG W3000h-bn

Just looked at your basic troubleshooting guide, very informative, thanks!
It would seem my problem is with the logic board, would you agree? I've found this written on the logic board:
W3000H
Chassis: LM82A
EAX39284802(0)
071031 J.K LIM

Also some stickers: 1: 82EBR040-8633, GB82FZ00JC; 2: 83EBT000-3068, DG 811.000.

Sadly, the PS was common to a few models and available to buy online, but a quick search yielded nothing for this board.

Re: Power supply troubleshooting on LG W3000h-bn

Ah good point. There are a couple:
P/N: EAX31845201/13 rev 1.2
HE is marked (vs YY) as is 32" EAY3305850 (vs 37" EAY3306450)
Model: LGLP3237HEP

Re: Power supply troubleshooting on LG W3000h-bn

I found my PS was the same as in this post: [url]https://www.badcaps.net/forum/showthread.php?t=19546[/url]
And they said to pull up the On/Off through a 1k resistor from the ST5V, which I did. Here are the voltages:
ADC and ST5V: 5.0V
On/Off: 2.9V
6V: 8V
12V: 12.5V
19V: 20.0V
24V: 24.4V
3.4 On: 0
3.4V: 0

So... looks pretty good, but I would have preferred something on the 3.4V. I presume the 3.4 On pin signal comes back from the other board, I guess it...

Hi! My LG W3000h-bn switched to standby while working, and has been stuck in standby mode since, even after hard restarts. I've confirmed the computer, cables and mains are fine. The power button works but goes straight to amber standby light, the display never comes on.

I've opened up the unit and started testing the power supply. Visual inspection reveals nothing (caps look fine). With PS disconnected from all other boards, I only get 5V on the standby 5V and "ADC", a few mV on 6V and 12V outputs, and 0V on everything else. I noted that the standby 5V seems to oscillate,...

Re: New Members - please post your introductions here

Hi all. Looking for help repairing my LCD monitor. This looks like a very good community for that. Looking forward to learning more and hopefully successfully repair my monitor.