Jvc lt32a61sj/bj audio but no picture

[MISTERG]

hi there!!
I have a "JVC LT32A61SJ (or BJ not sure) interiart" tv, which has no picture but audio is working fine.when switching on I can see the backlight but the picture is black and only audio is working. By pressing buttons on the remote control the tv 'responds' but no picture as said.
I will try to fix it myself to save me some costs though I am not a soldering wizard ..

Do you have any hint on where to look for the usual suspect?!Could it be smthng simple like a fuse?! or a bad capacitor?

many thanks in adv for any help

[selldoor]

Re: Jvc lt32a61sj/bj audio but no picture

Welcome to the forum-
It could be something simple as a connector loose or a blown fuse - possibly on the Tcon board or main video board.

We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed
https://www.badcaps.net/forum/attach...1&d=1290283049

https://www.badcaps.net/forum/attach...7&d=1280167246

Do you have a multimeter and can you use it?

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Hi thanks for helping out.

I can open the back cover and provide pictures.so i will revert on this one. About the multimeter i have very little knowledge how to use. But i am pretty sure i can follow a hint.

[truep]

Re: Jvc lt32a61sj/bj audio but no picture

Don't JVC's have the photocell on the main board that erases the ROM if power is turned on with the back off? You may need to find and cover it if it does. I'm sure someone will help you locate it if your model has one.

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Thanks for the info ! Then in order to be prudent, i will not turn the tv on when i take the back cover off. Btw the back cover did not have any special screws or connectors for the tv to "realize" that the back cover is open.

My plan is to open the back cover, take some pictures of frame and boards, look for any visible traces of bad caps or burned fuse if any and revert

[tom66]

Re: Jvc lt32a61sj/bj audio but no picture

Yeah JVC lock-out "feature" - erases the HDCP encryption keys - nasty! TV will still work but won't play back encrypted HD content.

[selldoor]

Re: Jvc lt32a61sj/bj audio but no picture

This seems to be a sm for this set combined with user guide - not read it!!
https://cdn.badcaps-static.com/pdfs/...2f606c04bd.pdf

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Yes this is definitely the one. Many thanks !!!
Just printed it out and work on the set this afternoon.

[rigeback]

Re: Jvc lt32a61sj/bj audio but no picture

Hi, this JVC troubleshooter might come in handy if its a PSU related problem, good luck.

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Thanks for the guide .

Yes finally opened the back cover.Here are the first pics

http://img804.*************/img804/7915/dsc01090v.jpg
http://img27.*************/img27/9461/dsc01089lu.jpg
http://img710.*************/img710/2453/dsc01088av.jpg
http://img9.*************/img9/8789/dsc01087bg.jpg
http://img600.*************/img600/8935/dsc01086j.jpg
http://img256.*************/img256/1770/dsc01085a.jpg
http://img41.*************/img41/8442/dsc01084z.jpg
http://img16.*************/img16/4061/dsc01083wz.jpg
http://img822.*************/img822/2306/dsc01091ba.jpg

From a first look no swollen or damaged capacitors identified either to psw or main board.Of cource i have to desolder the metal frame of the main board to check the caps underneath ..
Perhaps it is no easy way here, i guess as a next step, i'll go get myself a polymeter.
If your experienced eye sees smthng more in these pics i would be obliged

[tom66]

Re: Jvc lt32a61sj/bj audio but no picture

The main board is likely okay.

Can you take a picture of the whole chassis (all boards visible from back.)

Also, please use the Manage Attachments feature of this forum, as it is better for future users who might need to see those pictures.

[selldoor]

Re: Jvc lt32a61sj/bj audio but no picture

Hi can you have another look at the two green caps circled in yellow top left of pic
they look a bit odd? (leaky)

I have also taken the liberty of uploading your pics.

Are these Lelon caps?

EDIT - Sorry Caps look ok in pic 1084z

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Thanks for helping out and the attachments!!

Checking the diagram this is what i found.

I guess "Lelon" is a particular cap brand but i have to check it out later the day as i am not at home.

I will try also to check with the polymeter but i dont know how much voltage to apply

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

I disassembled the psw and saw that on top of the green Lelon caps there some traces of white smthng, dont know if it was dust though. I used the polymeter and tested resistance while placed the 200kΩ limit. The three green Lelon caps show value towards infinity, only the forth bigger green one shows a steady value of 3.4. also in the last pics and especially dsc1099 you can see the solder side end of the caps.Do you think ,that the board is ok?

I dont know if i used the polymeter correctly.If you see something else pls advise

here are the latest pics

[vinceroger69]

Re: Jvc lt32a61sj/bj audio but no picture

what type of meter are you using to test the capacitors its best to use a esr meter imo.

[selldoor]

Re: Jvc lt32a61sj/bj audio but no picture

I dont think we can do much until it is established if it has the TRAP switch.

So does anyone know what the trap switch might look like and how to disable it?

@misterg -
When it was on and the back light was on did it stay on and the power led light stay on.

That is, you had sound and backlight -so working normally but just no picture.
did you try different signal sources ?

Was this your set? were there any symptoms of failure before the picture didnt show
flickering/banding.snow?

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Att: Selldoor
When the set was on and the back light was on the set stayed on and the power led light stayed on.I had sound and backlight but just no picture. TV set responded to changing channels from the remote control.

I have not tried other digital sources. Symptoms of failure not aware of as the set belongs to my wife's sister. As I understood from her saying the set suddenly showed this problem.

I have performed this morning this step :

Disconnected the PSW board from the Main board. Placed the ground of the PSW board. Gave power to the PSW board. Set the round multimeter dial to the 200V, checked the four Lelon caps in question. The three in a row caps showed a value of 13V each. The forth bigger one showed no value at all.
I went to the electronics shop and purchased the forth one. (Lelon 1000uF 35V). Will replace it this afternoon.Hope I am lucky

n.b. I''ll google the trap switch as I;ve never heard this before

[MISTERG]

Re: Jvc lt32a61sj/bj audio but no picture

Att: vinceroger69

Polymeter is a conventional type (brand: avidsen) pls see below picture .

[vinceroger69]

Re: Jvc lt32a61sj/bj audio but no picture

this is what you realy want for testing the capacitors
http://www.ebay.co.uk/itm/New-ESR-an...item337636b0c8

[selldoor]

Re: Jvc lt32a61sj/bj audio but no picture

Hey Misterg You'd get extra point for a pic of your meter off one member but im not sure if he would knock points off for the way you are using it.
In your pic I am not sure what you are measuring and you may be correct but the meter is set on 200VAC whereas most board measurements would be DC?