Where is the tuner on the TV board? - Page 1
Forum section: electronics / repair

author: cgott42
author_rank: Newbie
timestamp: May 29, 2017, 04:20:02 am
content: Can you take a look at the pics of the board from the TV (Westinghouse wd42ut4490 4K TV)and let me know if you can spot the tuner?thx

author: cdev
author_rank: Super Contributor
timestamp: May 29, 2017, 04:30:39 am
content: Trace from the antenna/cable input. All modern TVs use SDR based tuners so its just going to be an IC.You need better lighting in your photos.

author: Nusa
author_rank: Super Contributor
timestamp: May 29, 2017, 06:34:50 am
content: Condolences if you're trying to do anything besides watch video on that model. I hear the input lag is really bad.Looks like you might have already torn off the RF cable connector. Hard to see any more, since that spot is in deep shadow in your pictures.There's no television license in the USA, so why do you care?

author: Rasz
author_rank: Super Contributor
timestamp: May 29, 2017, 08:45:49 am
content: RF frontend is in upper left, that rectangle with a space for rf shieldits SDR all the way down

author: coromonadalix
author_rank: Super Contributor
timestamp: May 29, 2017, 10:42:32 am
content: yeah all smt parts they did not put the shield plate, $$ economy loll

author: Nusa
author_rank: Super Contributor
timestamp: May 29, 2017, 11:12:04 am
content: Quote from: coromonadalix on May 29, 2017, 10:42:32 amNo, it was there once. You can see the tool marks left when it was removed. The RF connector would have been integral to the shield, so it's gone too.

author: cgott42
author_rank: Newbie
timestamp: May 29, 2017, 07:51:06 pm
content: yep, RF connector and shield are gone.Sorry about the lighting in the prev pics - here are much clearer close ups.Here are some better pics of the IC's - which one would the tuner beI'm guessing the first pick is of the tuner - let me know what you think

author: cdev
author_rank: Super Contributor
timestamp: May 29, 2017, 11:10:54 pm
content: The tuner chip and its immediate environs look as if there are some issues with two capacitors one is clearly not soldered properly and is touching its neighbor..Maybe there has been some damage done because of that? Also, was that TV maybe on a boat where it was exposed to salt spray (conductive and corrosive) and or seagull poop? (highly acidic)In any case its impossible to read the markings on that chip properly, maybe you could clean it off with some IPA, or distilled water so that the label is visible (also to verify its physical integrity)Looks like perhaps it might be missing a chunk?

author: Nusa
author_rank: Super Contributor
timestamp: May 30, 2017, 12:02:07 am
content: It's not a soldering issue...it's mechanical damage from a screwdriver. I'd say the solder joints on that cap are intact, it's just that the traces have been pulled off the board. Notice the case tabs are torn off, not unsoldered, with visible board damage on some holes. The dent on the crystal and the marks on the IC are probably from a screwdriver using them as leverage points. Looks like the chip was crushed enough that the entire corner cracked off...it's probably a dead chip now.

author: BMack
author_rank: Regular Contributor
timestamp: May 30, 2017, 01:58:50 am
content: Quote from: Nusa on May 30, 2017, 12:02:07 amI'd agree. Those tuner cans aren't easy to get off for someone that hasn't done it very often. That tuner is pretty common on newer low-end TVs, Westinghouse, Sceptre, Seiki, etc...Previously they had the electronics in the tuner can, I think last year was the first one I saw of this type. I keep a few of the cans in stock(I pull them off bad boards), I can ship one to you (OP) but you have to pay shipping...and I don't guarantee it will work when you put it on because of the damage.

author: BMack
author_rank: Regular Contributor
timestamp: May 31, 2017, 02:57:20 pm
content: Here's what the tuner can looks like: