Samsung LE37A656A1F

[del3165]

Hi I have a Samsung LE37A656A1F. The problem is with the colours or no colour. I have attached some samples of the problem. Hopefully someone can help.

[RJARRRPCGP]

Re: Samsung LE37A656A1F

The whiteness is more likely a faulty gamma chip.

[del3165]

Re: Samsung LE37A656A1F

Will that be the t-con board

[Shinju]

Re: Samsung LE37A656A1F

YES, if its an AUO Optronics made panel its almost always the AS-15 G U F ect. chip on the T-con.

If you are good at SMD soldering its a pretty simple task.

Take the panel apart and snap photo's of all the boards, also the T-con will be located at the top or bottom middle of the TV and usually covered by a metal shroud. SOME panels do not have a T-con as they are intergrated into the mainboard or TFT driver boards that are permanently attached to eh LCD TFT display and cannot be repaired.

[del3165]

Re: Samsung LE37A656A1F

I have removed the t-con board. The chip that I think is the
Sg-15 has no writing, it does look a bit burnt. The T-con board is a t370hw02 v6 does anyone know the exact AS-15 chip number for this board ie G U or F etc

[flocko]

Re: Samsung LE37A656A1F

The AS15-F can be used as a replacement for all G/U and F chips Flocko

[del3165]

Re: Samsung LE37A656A1F

The AS15-F can be used as a replacement for all G/U and F chips Flocko

Thanks just need to brush up on my soldering skill.

[tom66]

Re: Samsung LE37A656A1F

They are not identical but they can be used to replace each other on AU Optronics boards. AS15-F was used to replace AS15-U on a Sony board of mine, without issue (AUO 37" 720p panel.)

To test your board you will need a digital multimeter.

Board must be installed in TV and fully connected. Make sure to screw it down. Play a video or still image on the screen.

Then in the top right corner of the board you will see a set of points VGAMA1, VGAMA2...

Test each of these points (usually there are 18 or 22) and report back the voltage on each point with the number of the point..

For example:
VGAMA1 ... 1.03V
VGAMA2 ... 2.45V
...

[diif]

Re: Samsung LE37A656A1F

Thanks just need to brush up on my soldering skill.

I recommend using ChipQuik to aid in the removal of the old chip if it turns out to be faulty. It made the one i did a couple of weeks ago very easy.

[del3165]

Re: Samsung LE37A656A1F

VGAMA1. 14.78v
VGAMA2. 14.72v
VGAMA3. 10.3v
VGAMA4. 9.64v
VGAMA5. 9.34v
VGAMA6. 7.27v
VGAMA7. 7.21v
VGAMA8. 0.15v
VGAMA9. 0.15v
VGAMA10. 0.16v
VGAMA11. 0.15v
VGAMA12. 0.14v
VGAMA13. 0.1v
VGAMA14. 0.11v

This was tested with now tv home screen on.

[del3165]

Re: Samsung LE37A656A1F

I recommend using ChipQuik to aid in the removal of the old chip if it turns out to be faulty. It made the one i did a couple of weeks ago very easy.

I was going to order ChipQuik looking for a uk supplier. Last time I removed a chip like this I used hot air gun. The ChipQuik looks a lot easier.

[tom66]

Re: Samsung LE37A656A1F

The chip is definitely bad (the VGAMA are wrong) so replacing it should be all that's needed.
Personally I prefer a hot air gun for removing the chip.

[joe025]

Re: Samsung LE37A656A1F

Hallo i got a same problem with my samsung LCD.

My T-con Board is T370HW02 V6

Backlight Ok, Powersply OK,
Igot Sound but the picture is Black with coulured stripes.



I have checked the VGAMA Voltage:

VGAMA1. 15.2v
VGAMA2. 15.2v
VGAMA3. 10.69v
VGAMA4. 10.00v
VGAMA5. 9.69v
VGAMA6. 7.57v
VGAMA7. 7.50v
VGAMA8. 6.66v
VGAMA9. 6.60v
VGAMA10. 10.45v
VGAMA11. 4.65v
VGAMA12. 4.00v
VGAMA13. 0.2v
VGAMA14. 0.2v

Is the the AS15-F broken?

Thx for your help.

[tom66]

Re: Samsung LE37A656A1F

Yes, bad AS15-F. Replacing it should fix the problem.

[joe025]

Re: Samsung LE37A656A1F




Thats a picture of my screen.

[Alastair E]

Re: Samsung LE37A656A1F

Not saying that your Gamma chip is good--with those voltages--

But That image of half a black panel, the rest with vertical lines looks more like the panel itself...

Does disconnecting one then the other of the screen-tabs from the T-Con (While off) and trying again give say half a good picture....?

[joe025]

Re: Samsung LE37A656A1F

Hey thx for your answer.
I want Test it tomorow an tell what happend.

[joe025]

Re: Samsung LE37A656A1F

I have unpluged the left first:



then the right one:




Is this a Panel problem?

[Shinju]

Re: Samsung LE37A656A1F

Looks like it.

[joe025]

Re: Samsung LE37A656A1F

Should i try to repair the t-con?