Re: Samsung LN37A550 Repair

Thanks for the replies

The backlight is still working and I detect 12v at the T-Con board where the cable attaches. At the connection I checked the test pads and all show a voltage 1.07 to 1.27 v and a bit higher on the second row 1.21 to 1.45v not sure where the fuse is located. Nothing on the board looks like a fuse. Any help locating it would be appreciated. The 21 check pads for the gamma IC have similar voltages as before the IC replacement. The chip could be bad and I could replace it again if necessary. Any help would be appreciated....

Re: Samsung LN37A550 Repair

After replacing AS15-F on the T-con board and replacing the caps on the power board I put the TV back together but unfortunately this time their is no picture at all just a black screen. Sound is no problem and the channels are there. A friend of mine who replaces chips everyday did the AS15-F for me and I am pretty sure He did it right. Any ideas on what may have gone wrong?

Best Regards
Al

Re: Samsung LN37A550 Repair

Thanks tom66. Unfortunately the chalk did not work. Maybe somebody knows the exact chip number?

Best Regards

Re: Samsung LN37A550 Repair

Thanks tom66. when I lifted the thermal pad (not sure if this is for cooling) it came apart and lifted the numbers of the chip. So I will look for AS15-F and that should work.

Best Regards
Al

Re: Samsung LN37A550 Repair

Sorry I just found it. Is their a part number for this IC? Their appear to be no numbers on the chip

Best Regards
Al

Re: Samsung LN37A550 Repair

Thanks for the help. Yes I think I can do the repair but I am still trying to find the IC on the board. Please let me know where it is located.

Best Regards
Al

Re: Samsung LN37A550 Repair

Thanks for your reply. As requested by budm Below are the voltage readings for the VGMA test pads.

12v pin into T-con board 11.64 v

VGMA 1 15.57 v
VGMA 2 15.46 v
VGMA 3 15.38 v
VGMA 4 13.05 v
VGMA 5 11.98 v
VGMA 6 10.80 v
VGMA 7 10.18 v
VGMA 8 9.99 v
VGMA 9 8.43 v
VGMA 10 8.20 v
VGMA 11 8.05 v
VGMA 12 6.65 v
VGMA 13 6.59 v
VGMA 14 6.31 v
VGMA 15 5.05 v
VGMA 16 4.82 v
VGMA 17 4.35 v
VGMA 18 3.56 v
VGMA 19 2.90 v
VGMA...

Re: Samsung LN37A550 Repair

Tonight I opened the TV up and all I see is two bad capacitors on the power board CB852 1000 uf ans CM859 470 uf. I also took pictures of the boards for the board members to review. I was not able to detect any damage to the boards but I am not an expert. Any advice on how to proceed would be greatly appreciated.

Best Regards
Al...

Recently my Smsung LN37A550 has developed a problem where the picture starts to fade to white and I am hoping one of the forum members can kindly help me make a preliminary diagnosis. The tv starts normal and the picture is fine for several minutes before the picture starts to fade as if a heavy fog came in. You can still see the picture but it is now obscured by this white haze. Sometimes the picture goes back to normal after a while but always reverts back to the white haze. Turning it of and then on again it will start normal but soon the problem will come back. The only other symptom is that...

Re: LCD TV and Monitor basic troubleshooting guides

Thanks! This is great information to get started on my repair project

Regards
Al