Sony KDL-37XBR6 Black Screen :(

[budm]

Re: Sony KDL-37XBR6 Black Screen

Per post 32: backlights are on.

As I stated in post #1, I do see lights on the back that light up when I turn the power on. I assume that is the backlights. The screen is black, but if I press on it, I can see light where my finger presses in on the front screen. The panel on the very top of TV is what I was talking about being stuck on one channel. There is no channel number displayed on the front screen. I get absolutely nothing but black on front screen!

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

until you replace the fuse you cant really test much more.

Roger on that! I just hope that after I replace the fuse and power it on, I don't see this..LOL

[vinceroger69]

Re: Sony KDL-37XBR6 Black Screen

until you replace the fuse you cant really test much more.

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

first question
Does the LCD have backlit correct?

Sound?


if you have these two things you will have a fuse smd in the plca tcon malfunction

fga

I do see light coming from the backside when the power is on. I assume that is what you are referring to? Yes, I do have sound from the speakers, but I can't change channels nor lower/raise the volume.

[fga]

Re: Sony KDL-37XBR6 Black Screen

first question
Does the LCD have backlit correct?

Sound?


if you have these two things you will have a fuse smd in the plca tcon malfunction

fga

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

Ah, OK! Thanks guys! Thumbs up to y'all..Cheers!!!

[neilc6]

Re: Sony KDL-37XBR6 Black Screen

I see, thanks! So when these T-con's fail, is it usually a part that is fairly easy to replace/fix? Or is it just better to get a new T-con for this Sony I have? I'm only saying this just in case down the line that the T-con would fail. Thanks!

Looks like with your model, the tcon is abundant and reasonably priced for a new board.

https://ebay.us/KcCoCu


On some Sony models, there is a low supply of used boards and sellers want big bucks. The IC is a fine pitch 48 pin QFP and tricky to replace without a bit of experience and a hot air tool.

[budm]

Re: Sony KDL-37XBR6 Black Screen

Parts for your TV: http://www.shopjimmy.com/catalogsear...ony+KDL-37XBR6

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

The Sony LCDs seem pretty solid and dont have capacitor failures common with LG and Samsung TVs the same age. However, AS15F failure on the tcon is common which will result in co!or issues or a whitewashed screen.

I see, thanks! So when these T-con's fail, is it usually a part that is fairly easy to replace/fix? Or is it just better to get a new T-con for this Sony I have? I'm only saying this just in case down the line that the T-con would fail. Thanks!

[neilc6]

Re: Sony KDL-37XBR6 Black Screen

The Sony LCDs seem pretty solid and dont have capacitor failures common with LG and Samsung TVs the same age. However, AS15F failure on the tcon is common which will result in co!or issues or a whitewashed screen.

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

Thanks Neil, much appreciated! I will report back here once I have installed the new fuse. I'm hoping that the new fuse will make everything work as good as new.

Any idea or guess as to how long these Sony TV's may last? I mean I know that at any time something can go haywire with electronics. I still have a Mitsubishi TV from the early 90's that is still playing! Knock on wood..LOL

[neilc6]

Re: Sony KDL-37XBR6 Black Screen

If you want a 0603,

https://www.digikey.com/product-deta...0CT-ND/1878995

They are only 30 cents each so order 5 of each size if you want. Don't think Arrow does small orders. Stick with Digikey.

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

If you read through the threads I linked previously (post#53), there is a good chance that replacing the fuse will fix your problem. Digikey ships USPS first class for a couple of bucks and you risk damaging your board by trying to solder big wires to pads meant for an 0402 part.

I measured the fuse that is bad, and it is approximately 1.75mm(long) X .85mm(wide) That fuse you gave me the link to appears to be much smaller, and I don't think it will work. I have located another smd fuse that is rated at 32V/5A that is 1.61mm X .88mm in a 0603 type. Here are 2 links I have found listed by Arrow:

https://www.arrow.com/en/products/04...wra/littelfuse

https://www.arrow.com/en/products/sf...p500m-2/bourns

Do you think any one of these would be OK? Thanks!

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

you don't have to solder to the fuse. Follow the traces to solderable areas "close by".... obviously one would be near / at the FET in question. the picture of the area that was attached shows lots of potential solder points to readily solder wiring for an "external fuseholder / fuse". Using your own "DIY fuse wire" is a bad idea.

Yeah, you're right. I'll just order the fuse and be done with it. I've come this far, no use in taking any unnecessary chances. Thanks again for your help! I just hope that it was the fuse, and not another component that caused the fuse to burn out. Perhaps a power surge, lightning or something else that may have caused this fuse to blow. Wish I knew for certain. Cheers!

[neilc6]

Re: Sony KDL-37XBR6 Black Screen

If you read through the threads I linked previously (post#53), there is a good chance that replacing the fuse will fix your problem. Digikey ships USPS first class for a couple of bucks and you risk damaging your board by trying to solder big wires to pads meant for an 0402 part.

[budwich]

Re: Sony KDL-37XBR6 Black Screen

you don't have to solder to the fuse. Follow the traces to solderable areas "close by".... obviously one would be near / at the FET in question. the picture of the area that was attached shows lots of potential solder points to readily solder wiring for an "external fuseholder / fuse". Using your own "DIY fuse wire" is a bad idea.

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

So I tried soldering to that tiny fuse with an automotive fuse as suggested, but I just can't get it to hold. I also thought that I may be able to get a small smd fuse off of some left over old computer boards, but it seems that these pc components don't have fuses built on. I managed to find one on a mother board, but it was much larger in size and probably wasn't rated the correct V/A.

I was thinking about trying to solder one single piece of copper wire that I know would burn up before a 5 amp rated fuse would. If this fuse is the cause for that BU board not to work, wouldn't it be OK to try and use this small single copper wire just temporary to see if I get a picture? Then if I do, I can order the correct fuse and solder the new fuse on top the old faulty one. What do y'all think of this? I will wait to hear back before actually doing this! Thanks again!

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

have you got something like a 5amp car fuse you could solder two wires too and use that temporary as a fuse, jumping a fuse is never a good idea even for a quick test as if a short circuit still you could burn up traces etc.

Yes I do have some car fuses I could try. Thanks for that! I'll rig it up and see what happens. I'll report back later once I get to it. Thanks again!

[vinceroger69]

Re: Sony KDL-37XBR6 Black Screen

have you got something like a 5amp car fuse you could solder two wires too and use that temporary as a fuse, jumping a fuse is never a good idea even for a quick test as if a short circuit still you could burn up traces etc.

[Gammaray]

Re: Sony KDL-37XBR6 Black Screen

Higher Voltage rating is OK.

OK, Thanks again!

BTW, I was thinking of maybe soldering a very small gauge copper wire to jump that fuse just to see if I can get the TV to work. Would this OK to do just to try it out?

One other thing I have noticed is that the BU board in my TV seems to be marked as if someone had already fixed it or tried to fix it. But I am not 100% sure about this. What brought this to my attention is that they have some red and blue colored marks on the board, and also the other fuse (F1421) that is shown on the schematics you posted is not there? Is that fuse supposed to be soldered there, or perhaps some models don't have them?