Re: Samsung 2253bw

I got 900 ohms for both transformers.

Looks like I can get a pair of stm8309 ICs for $11.90 on eBay or the entire board for $24.50.

And yes, I blew it on the re-cap

Re: Samsung 2253bw

I substituted a good backlight in each of the 4 backlight connectors (with the remaining 3 backlights still connected) and it lit up for 2 secs in each position.

I removed the 2 transistors and ohmed them and they were both the same:
pin 1 to 2: open
pin 1 to 3: open
pin 2 to 3: 5.1 kOhms

From the enclosed pic it looks like one of the stm8309 ICs smoked. It's the 8 pin IC on the right....

Re: Samsung 2253bw

Best pics I could get of it......

Re: Samsung 2253bw

Thanks for the reply. No pink tint that I can see. No vertical lines either.

On the component side of the power supply board there is some discoloration like something got hot. It was like that when I got it. I'll post a pic later.

Re: Samsung 2253bw

Sorry for my ignorance but I'm not sure what you mean by classic tests. My experience fixing LCD monitors is limited to recapping them.

I was able to measure voltages at the inverter with the backlights unplugged:
VCC: 17V
UVLO: 6.8V
EN: 1.8V
FAIL: 0V
OVP: 0V
Vref Out: 5V

Re: New Members - please post your introductions here

Hi, I joined recently and have found this to be a great forum full of accurate information and helpful people.

Hi, first time post. First of all, this is an awesome forum. I've used the information here to repair several LCD monitors. However, I'm stumped on this latest one (2253bw). It has the familiar problem of coming on for a second and then going dim. I've already recapped it but there's no change in behavior. What should I check next? Transistors? Xfmrs? CCFL? I searched the forum but couldn't find a service manual or schematic. It has the SEM2006 inverter. The blue power light stays lit steady.

The picture looks good for the second or so that it's on.

Thanks,
...