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Equipment Repairs => LCD TV forum => Topic started by: Turnip on February 19, 2019,11:47:13

Title: Samsung LE32D580 bright picture.
Post by: Turnip on February 19, 2019,11:47:13

Hi folks,

Have one which comes on with a dull picture, eventually brightens but low contrast.

Suspect V460HJ1-C01 T/con but the chips don't register on Ebay - Any thoughts ? - Chris.

Title: Re: Samsung LE32D580 bright picture.
Post by: jordan on February 19, 2019,15:24:31

http://www.electronicsmarket.com.au/0903-001718/samsung-microcontroller61p805-rg480wtlqfp4-p-8565.html

Title: Re: Samsung LE32D580 bright picture.
Post by: downunder on February 20, 2019,02:33:36

Hi Chris,

Sounds like a gamma problem. See if you can find on the T-con, usually near the flexies that go to the panel, a series of test points labelled VGMA1 to VGMA x, or VGref1 to VGref x.

They're relatively tiny and in a single or double row. Measure the volts on each one in sequence. Depending on which end you start at, the V on each TP will slowly increase (or decrease) as you progress through them on a good T-con. May start at around 1V and go up to 21V, but each one must be higher than the previous one eg. 1.5V to 2V to 3.1V is good on the first 3 TPs, but 2V, to 3.1V, to 1.5V  on the same TPs is bad. Each one needs to be higher than the previous one through the sequence of TPs. Any reductions or sudden increases will mean bad gamma ie a faulty gamma IC aka AS15 etc.


Don't know what gamma chip is on your T-con, but fault is more likely to be this than a micro. If it's gone to the screen you describe, it may give itself away by being very hot to touch. See how you go - Bruce

Title: Re: Samsung LE32D580 bright picture.
Post by: Turnip on February 20, 2019,07:24:52

Thanks Bruce, will check.

Guess the big chip is the M/proc. Other two I can't identify - CM1501  and 9674E/Ti050/+NTCH - Chris.

Title: Re: Samsung LE32D580 bright picture.
Post by: downunder on February 21, 2019,03:33:24

Looking at a piccy of the board online, UP1 - the CM501 seems most likely - available from Aliexpress in China. Zero result on the other IC.

WRT the Gamma check points, they're located near the left flexy connector, marked as GM1 to GM18. If the readings are all screwed up, a fleabay T-Con
might be the best option.

Bruce

Title: Re: Samsung LE32D580 bright picture.
Post by: astracat on February 21, 2019,05:19:10

hi turnip
have complete working boards out of a 325000 from screen damaged tv
what number is on your t/con /
regards
astracat

Title: Re: Samsung LE32D580 bright picture.
Post by: Turnip on February 21, 2019,10:14:16

Hi 'Cat'

My T/con is V460HJ1-C01 - Thanks - Chris.

Title: Re: Samsung LE32D580 bright picture.
Post by: astracat on February 22, 2019,15:12:23

hi turnip
t/con i have is t320hvn03-0 /32t36-c08
not sure if it will work in yours
regards
astracat

Title: Re: Samsung LE32D580 bright picture.
Post by: downunder on February 24, 2019,04:42:17

Heaps of these t-cons on ebay, but they're going for heaps.


Bruce

Title: Re: Samsung LE32D580 bright picture.
Post by: Turnip on February 25, 2019,10:34:12

Yep, that's the problem, cust feels £45 over the top - Chris.

Title: Re: Samsung LE32D580 bright picture.
Post by: downunder on February 26, 2019,02:54:32

Know the feeling - deep pockets and short hands.                               Bruce

Title: Re: Samsung LE32D580 bright picture.
Post by: Turnip on February 27, 2019,12:43:20

Hi Bruce,

Out of interest I checked test points you mentioned. They all seemed to vary in the way expected. Did notice a little SMD chip next door which might be a regulator as getting awful hot.  12v in but nothing out. Thought might be a duff ceramic cap, but no. Can't win 'em all, but fun - Chris.