Samsung LN40B530P7N

[NooBit]

My Samsung TV model LN40B530P7N, is not functioning properly. It began when the display distorted the colors after about 10-15 minutes of use (before the picture was perfect). I was able to adjust the color/brightness options to correct the issue until now. The picture is saturated with brightness immediately when I turn the TV on and i cannot adjust the brightness/back-light to compensate. Attached is what the picture looks like with all the brightness taken out. I went into the service menu to make changes and nothing I tried was successful, I even reset to factory settings. Any help would be appreciated.

[Glitcher]

Re: Samsung LN40B530P7N

Could be bad gamma IC on the tcon board. Can we get close up photos of the Tcon board? We're looking for an IC chip labeled AS15.

[NooBit]

Re: Samsung LN40B530P7N

Here is the pictures i took of the Tcon board. Let me know if you need anything else.

[Glitcher]

Re: Samsung LN40B530P7N

I think it's the big chip on the second photo, is it labeled AS15? (AS15-F, AS15-G, etc)

If you have that chip, do you see the test points labeled Vgma1, Vgma2, ..., Vgma22,

Measure each voltage in order for each test point and report it here.

[budm]

Re: Samsung LN40B530P7N

U21, AS15 GAMMA IC more likely to be bad. Yes, check those GAMMA Voltages and report each DC Voltages.

[NooBit]

Re: Samsung LN40B530P7N

Yes the chip in the second photo is AS15-F, the voltages for VGMA1-22 are as follows.

1. 11.58
2. 12.70
3. 12.70
4. 12.64
5. 12.62
6. 12.60
7. 12.58
8. 12.57
9. 12.55
10. 12.55
11. 12.54
12. 7.03
13. 6.62
14. 6.48
15. 5.27
16. 4.96
17. 4.31
18. 3.41
19. 2.65
20. 0.65
21. 0.53
22. 0.29

[tom66]

Re: Samsung LN40B530P7N

The chip is bad.

[NooBit]

Re: Samsung LN40B530P7N

Should I order a new T-con board or try and replace the chip itself. If I replace the chip are all AS15-F chips interchangeable or do I need to find a specific one. Thank you all for the help.

[tom66]

Re: Samsung LN40B530P7N

Replacing it is somewhat tricky, but can be done if you have done surface mount work in the past. All AS15-F are interchangeable. You can also use AS15-U and AS15-H. Replacing the board will also work although a future failure may occur using an older board and IC.

[OneAn9ryN00b]

Re: Samsung LN40B530P7N

Just a quick question. I think I may also have a bad as15-g, when testing voltages on the pins, where should I get my ground from? The metal chassis, or the ground pin on the plug from the wall?

Also us there any particular pins I should do? I see some threads that only have 24pins of the 48 total listed, whare others list just particular pins listed.

Thanks in advance.

[selldoor]

Re: Samsung LN40B530P7N

Did you try reading the thread? you dont measure on the pins you measure on the test points. Use the chassis or a groundscrew attaching the tcon to the chassis.

Please can you updata your profile with country and mains voltage

[OneAn9ryN00b]

Re: Samsung LN40B530P7N

Country updated. And yes I did read through the thread, along with many others trying to figure out where to test.

Edit: I can't find anything on my tcon board that says vgma1, 2, etc.

[selldoor]

Re: Samsung LN40B530P7N

Well you better post a picture of it? Good clear and in focus so we can read the detail on the board

[truep]

Re: Samsung LN40B530P7N

Top of picture 2.

[selldoor]

Re: Samsung LN40B530P7N

Top of picture 2.

Yes - thats what I thought but there is always a very small chance he has
a different board so we may as well see it

[OneAn9ryN00b]

Re: Samsung LN40B530P7N

Here's a pic of the whole board, it probably will be a different board, as its from a Samsung LN32A330. I did find test points GM5 through GM14 near the top left. But thats all I could find....this is like where's waldo

[selldoor]

Re: Samsung LN40B530P7N

I am not happy that you have jumped an unrelated thread but have marked the Gamma test points Please start your own thread to list the results of the test - I actually have no idea what they mean but others can interpret them.