40" RCA L40FHD41 No Picture + No Audio

[ajsterr4]

This TV turns on for a sec before it turns black, so far:

flashlight to TV screen shows image being shown (good thing for t-con right?)

I also connected laptop to it via HDMI and TV is by default on 'HDMI 1 setting'

It makes video on laptop really slugish while hdmi is connected to the TV, and the audio is only pops/noise coming from TV

What should i be looking for?

The TV is disassembled and its kind of a project for me for an extra TV in the house and to practice fixing more things

Elsewise the TV has little value

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

Need good clear straight on pictures of back of tv with cover off and each board.
Do you get any flash on screen when you first turn it on?

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

There was no flash that i recall, I turn on power, TV light turns blue/stays lit blue tv screen itself is black while powering up for the first second (normal) then image for a moment, before it quickly dims black and no picture

here's the pics I got to help, hope they suffice if not let me know

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

I am seeing a bunch of bulged caps on power supply.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

The blue ones? Are they all supposed to be flat? I looked for bulged caps but thought bad caps would be even more bulged than these.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

Also I know the main board functions with the power board, do you think one is the culprit of the other failing? I'm a beginner so excuse me, but, it seems like the capacitors swelling and going bad is pretty common, do you suppose I can fix the board? I can solder

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

I would replace all caps at top of board. I see at least 5 bad ones. Also they don't have to be bulged to be bad. Changing caps is easy and not to expensive.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

By all caps do you mean the cylindrical molded ones and the flat blue plastic ones, or literally every single capacitor even the non-blue ones? I don't 100% know what every component is or isn't a capacitor...

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

I can buy a capacitor kit, which kind of capacitors do you think i am looking for?

[attainteddragon]

Re: 40" RCA L40FHD41 No Picture + No Audio

change out the ones i marked in orange and if you don't have access to an esr meter, change out the ones that are marked in green.

make sure you get low esr, 105 degree caps.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

They look to be 35v & 16v 1000 micro farad caps

So only invest in the battery cell capacitors and not the disk ones?

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

Yes just the cylindrical ones that attainteddragon marked. That are polarized when you go to replace the neg. goes towards wide band on board.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

That are polarized when you go to replace the neg. goes towards wide band on board.

I'm sorry i do not understand

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

Look at your board the stripe on the cap goes to the wide black band on the board

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

So i replaced all 8 capacitors and tv still doesn't work, i don't know how to test everything with a multimeter tool, although, i do have one.

TV is turning on, half of screen is blue, the other half is black.

Then it just turns off after a sec...

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

There is one more big capacitor at the bottom left, its 450 volts...

looks a tiny bit bulged, but wasn't replaced.

what do you guys think?

[budm]

Re: 40" RCA L40FHD41 No Picture + No Audio

It sounds like the power supply board is running otherwise you will be getting the backlights for you to see half blue screen.
Try disconnecting the cable to the T-CON board and see if the TV will stay on longer than a few seconds.

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

The TV will stay powered on, but the screen will turn off.

Disconnecting the two main ribbons from the top of the TCON?

I disconnected the power cable and the knitted colored cable from it and the screen wouldn't turn on at all

[ajsterr4]

Re: 40" RCA L40FHD41 No Picture + No Audio

I went back to check my solder joints and touched a few up, now tv won't power on normally and i hear a click/beeping sound when it's plugged into power

[dskall]

Re: 40" RCA L40FHD41 No Picture + No Audio

Can we get a picture of the power board again?