Re: Samsung LN37A450C1DXZA LCD TV with Saturated Image

Thank you Tom.
Here are the Gamma voltages:
V1 = 15.6
V2 = 15.6
V6 = 15.8
V7 = 15.6
V8 = 15.6
V10 = 15.8
V11 = 15.8
V12 = 8.1
V13 = 6.3
V15 = 8.7
V16 = 5.2
V17 = 5.0
V21 = 0.5
V22 = 0.4
I entered the voltages into your spreadsheet and the result is fail. I've purchased a new Gamma IC off Ebay. I know a Technician with SMD soldering expertise and will ask him to replace the IC. I'll get back to you with the results......

Re: Samsung LN37A450C1DXZA LCD TV with Saturated Image

Thank you Tom.
See pics of the T-Con board. It is part number T370XW02. I'd say the Gamma IC (U202) is an AS15-F if I'm reading the text on the chip correctly. So where do I make the Gamma voltage measurements? I'm guessing the 16 circular pads very close to the ribbon connector? Note there is a VGMA_REF pad near the crystal. Is this my -ve connection point for the DVM?
I figured out why I couldn't access the service menu. I wasn't pushing the buttons on the remote fast enough. You have to be fairly quick pushing...

I'm trying to repair a Samsung 37 inch LCD TV that has a saturated white/blue image. Please see the attachments... The original fault was the screen would gradually go red until it was completely saturated. At power-up it had a normal image but as the TV heated-up it would go red. When I received the TV I found it had a constantly white/blue saturated image.

I removed the rear cover and checked the power supply for any signs of bad caps but didn't find anything unusual. I checked all the connections between the Main, T-Con, Power Supply and Inverter boards but didn't find anything...

Re: New Members - please post your introductions here

G'day!
My name is Scott and this is my introductory post. I'm located in Southern California (USA) and work as a Electronic Systems Engineer for a company involved in racing. I came to this site because I'm trying to fix a Samsung 37 inch LCD TV. So far I've found a great amount of really useful information. Hopefully with a little help I'll be able to fix this one.
Have a great day.