Samsung LN37A450C1D

[boomer6187]

The wife and I were watching TV the other night and noticed that the picture got darker. We checked other stations and even check the dish network guide and everything was darker. I read a few post and it seemed that everything pointed to the inverter board. I ordered the inverter board and swapped it out but this did not fix the issue. Just wondering if anyone might have some ideas on where I can start to fix this issue. I don't have any schematics. So, I don't have any idea on where to start taking voltage measurements. Any help would be appreciated. Just to clear everything up. I do have a picture but everything is darker now. Even if I increase the back light, it does not help.

[budm]

Re: Samsung LN37A450C1D

Can we see the screen shot? the pictures are sharp? Do the brightness, contrast, and the backlights level control has any affe t?

[boomer6187]

Re: Samsung LN37A450C1D

Here are a couple of pics. The only thing that seems to make the picture brighter is by increasing the brightness. Increasing the back light level does not help any

[boomer6187]

Re: Samsung LN37A450C1D

Forgot to add that everyone now seems to have been on vacation at a beach for a month and have gotten a great tan. Night scenes are very dark and you can not tell what is happening.

[budm]

Re: Samsung LN37A450C1D

I would try doing the factory reset: MUTE, 1, 8, 2 (https://www.badcaps.net/forum/showth...ght=mute+1+8+2) but you must be real careful once you get into service mode. This can be the T-CON board problem, you can take some DC Voltage readings:http://www.shopjimmy.com/catalogsear...ng+LN37A450C1D, I do not not which T-CON board you have, you will have to look at it, it will be under the metal shield.
I will let some one else explain the exact procedures since I not real good at giving instructions.
In the mean times please upload the back side of the TV so we can see all the boards using attachment function

[boomer6187]

Re: Samsung LN37A450C1D

I will post pics of the back side of tv tomorrow.

[boomer6187]

Re: Samsung LN37A450C1D

Here are some pics of the backside. Doing a reset did not do a thing.

[budm]

Re: Samsung LN37A450C1D

Oh another one of those AUOPTO LCD panel, check the DC voltage on the test point VGMA1 ~22.
Report each reading in sequence:
VGMA1: XXX V
.........
VGMA22: XXX V

We also need to see the P/N On the left IC with the yellow thermal transfer pad on it.

[boomer6187]

Re: Samsung LN37A450C1D

where do I put the leads from my multi-meter to check these test points. I know that the test points are on the TCON board. Is the black lead on any ground and where is the red lead for each point?

[budm]

Re: Samsung LN37A450C1D

Black lead on the chassis, TV is powered up of course, and do not let the probe slip on you.