Toshiba 36ZP38 Possible DFS Module Fault?

[stevem0sbf]

Hi, I have read pretty much all 28 or so pages on the Toshiba DFS Module fault on this extremely helpful forum.

However my Toshiba 36ZP38 has slightly different symptoms to the horizontal lines and stripes on the picture described by many people. With my set the number of colours seems to have reduced so that all the subtle shading in the picture is now stepped. The effect appears to be like reducing the colours down to 256 on a PC when viewing JPEG images. There is no screen breakup, but there is wavering noise on the blue screen (no signal input) and on a white raster.

If anyone could take a look at the screen pictures in this post and let me know whether they feel this is the DFS module, I would much appreciate it. Note the rough steps in the soft shading on people's faces.

As I am a trained electronics engineer, changing the module is no problem and Toshiba have kindly agreed to replace it free of charge and send one to me - although it hasn't arrived yet.

My set is 6 years old and has previously had a good reliability record until a few weeks ago when the picture problem occurred.

Any help would be appreciated.

Thanks
Steve
(Newbury)

 

[ThundyCat]

Check this thread out fella.

TC

 

[JayCee]

Yes...solarization on the pic = DFS module

 

[stevem0sbf]

Sure enough I changed the DFS module to the new one provided by Toshiba and it works fine. Before I did that I removed the screening can from the old module and pushed each of the large IC's with my thumb. That cured the fault - so there is obviously a bad joint on one of the IC's. I may get some flux and re-flow it to keep it as a spare.

Thanks for your help
Steve

 

[JayCee]

so there is obviously a bad joint on one of the IC's

This is well-known but the problem is access to some of the SM ICs which have legs bent under the body of the IC making repair impossible without an expensive SM soldering rework station and the correct bit.