Good day folks. I'm having a bit of trouble with a Sammy TV here and it's not the first time it happens sadly: it's got a white, washed out picture. My first guess was obviously a faulty AS15F gamma IC, but upon removing the t-con board, I noticed it doesn't use an AS15f, instead a RM5010, which is supposedly equivalent nevertheless. Not wanting to risk replacing it with an AS15 which I have plenty on hand, I actually dished out and bought the exact part and replaced it, but unfortunately it didn't fix the issue, it looks exactly the same.
I thought perhaps my buddy damaged it by blasting it with too much heat like he tends to do (he always keeps his hot air gun turned all the way up to 450c, regardless of what he's soldering and despite me protesting...NVM...) so I tried an AS15f in its place and although it had no funny side effects (which would confirm it's indeed compatible), it still had the same white picture, so the issue is definitely someplace else, perhaps even somewhere other than the t-con. The second time, I was very careful to heat the part as little as possible and I doubt they're THAT sensitive to begin with. Also, the chances of getting TWO faulty parts of TWO different kinds in a row are virtually non-existent IMO.
I know with such issues it's imperative to measure the V_Gamma voltages on those test points, but I haven't done that yet due to lack of time - I shall do it post-haste though. It's important to note that the guy who brought it in said it happened after "the TV reset" and I put that in quotes because those are his exact words with no additional details as to what qualifies as a "reset" to him...did he actually access the service menu and messed around with those settings or simply unplugging the set counts as "resetting" it ? Who knows....can anything in the service menu cause such behavior ? I doubt it - if anything, to my recollection, changing the panel type would result in a dead set with no picture at all, but not this. My next guess is the panel itself. It's such a common board too and everybody seems to fix them by replacing the gamma IC, but to me this isn't the first time a gamma IC doesn't fix such issue....so goddamn annoying
Another frustrating thing, though this is backstory, is that I had an identical T-con board around the shop, but I sold it just a few days before the chap brought the TV in, so I could've at least checked if it experiences the same issue with a known functional board...
I thought perhaps my buddy damaged it by blasting it with too much heat like he tends to do (he always keeps his hot air gun turned all the way up to 450c, regardless of what he's soldering and despite me protesting...NVM...) so I tried an AS15f in its place and although it had no funny side effects (which would confirm it's indeed compatible), it still had the same white picture, so the issue is definitely someplace else, perhaps even somewhere other than the t-con. The second time, I was very careful to heat the part as little as possible and I doubt they're THAT sensitive to begin with. Also, the chances of getting TWO faulty parts of TWO different kinds in a row are virtually non-existent IMO.
I know with such issues it's imperative to measure the V_Gamma voltages on those test points, but I haven't done that yet due to lack of time - I shall do it post-haste though. It's important to note that the guy who brought it in said it happened after "the TV reset" and I put that in quotes because those are his exact words with no additional details as to what qualifies as a "reset" to him...did he actually access the service menu and messed around with those settings or simply unplugging the set counts as "resetting" it ? Who knows....can anything in the service menu cause such behavior ? I doubt it - if anything, to my recollection, changing the panel type would result in a dead set with no picture at all, but not this. My next guess is the panel itself. It's such a common board too and everybody seems to fix them by replacing the gamma IC, but to me this isn't the first time a gamma IC doesn't fix such issue....so goddamn annoying
Another frustrating thing, though this is backstory, is that I had an identical T-con board around the shop, but I sold it just a few days before the chap brought the TV in, so I could've at least checked if it experiences the same issue with a known functional board...
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