Weird looking soldered joint?

[teeb]

Hi BADCAPS community!

I'm investigating on a TV which display shows crap intermittently.
Here is the inverter board with its crappy looking joints. What do you think? Is it normal ? (caps aren't blown)

[PCBONEZ]

Re: Weird looking soldered joint?

That's just left over flux.
Sloppy work but it shouldn't hurt anything.
.
A tooth brush [or Q-tips] and some isopropyl alcohol should clean it up so you can actually see the joints to check them.
.

[teeb]

Re: Weird looking soldered joint?

Thank you for the prompt answer PCBONEZ

[Koda]

Re: Weird looking soldered joint?

Those are actually pretty good joints by me, maybe a bit too much solder but they look clean and well connected so probably better then most.

[teeb]

Re: Weird looking soldered joint?

the brownish part looked suspicious though!

[999999999]

Re: Weird looking soldered joint?

It is normal? No. Normally through hole capacitors are soldered on the other side of the board and only about 1/3rd as much solder is used. So, I question whether the solder joints are good but they may still electrically be fine, don't look grainy or disrupted like a bad joint usually does.

However, the inverter board is for backlighting, should only affect the operation of that, not other display issues.

[Scenic]

Re: Weird looking soldered joint?

Normally through hole capacitors are soldered on the other side of the board and only about 1/3rd as much solder is used.

I've seen a few single-sided inverter boards which had no through-holes at all.. Just solder pads. The caps were soldered in just like in the pics in the first post.
It does look quite sloppy with the leftover toasty flux, but it shouldn't do any harm or cause problems usually. Just like PCBONEZ said, you could just remove the flux if you want to/if it bothers you.

As for the display showing garbage, I'd focus on the mainboard and maybe the T-CON board if you took care of the PSU caps already.

[PeteS in CA]

Re: Weird looking soldered joint?

Looking at the joints, I'm going to guess that the part is installed as if it were a surface mount part, with the leads laying on and soldered to pads on top of the board. I would also guess that this cap was replaced during manufacturing test or in a previous service event. So, maybe too much solder was used, or maybe the cap leads were not quite long enough to reach the PCB, making extra solder necessary to complete the circuit. And whoever did the solder work didn't clean off the flux (which ages with heat and turns brown).

[selldoor]

Re: Weird looking soldered joint?

How about a picture of the other side of the board ?

[teeb]

Re: Weird looking soldered joint?

Well, there is no wiring on the other side

[popeye]

Re: Weird looking soldered joint?

Hi BADCAPS community!

I'm investigating on a TV which display shows crap intermittently.
Here is the inverter board with its crappy looking joints. What do you think? Is it normal ? (caps aren't blown)

If I were you I would take a picture of the fault when it happens and tell us of anything else that happens also model number and make of lcd board numbers and pictures all boards if possable you will get a much better responce from a TV engineer that way hope this helps.

regards
popeye

[teeb]

Re: Weird looking soldered joint?

The TV has been repaired. The tin must have melt as 2 pins were in contact under the main processor unit. Thanks for your help.

[sam_sam_sam]

Re: Weird looking soldered joint?

When I see soldering joint like that I reflow them I question how good they are because a few times I have seen alot of flux flow out of the joint