SONY BRAVIA 40WE663 odd problem

**nomoresonys** · 03-20-2021, 12:54 PM

Re: SONY BRAVIA 40WE663 odd problem

Go ahead and turn on the tv for a minute see if the display is any different, just to see if there's any effect, maybe you can find one that size on a scrap board or even an old laptop may have one that size, they don't cost much, it's just the dam shipping on one little component that is no fun.

**nomoresonys** · 03-20-2021, 12:55 PM

Re: SONY BRAVIA 40WE663 odd problem

The cap does read short out of circuit, correct?

**diif** · 03-20-2021, 01:08 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by vikivng

It seems this was the only capacitor of this size on the board.
Is it a matter of testing other caps to see if it works since I have no reference point?

There is a capacitor at the bottom of your photo in post #15 that looks the same size.

**dick_barton** · 03-21-2021, 05:38 AM

Re: SONY BRAVIA 40WE663 odd problem

Can you check if one of the pads that the shorted capacitor was connected to is connected to chassis (ground).
If it is then as a quick test I would solder a 10uF capacitor across the pads with the negative of the capacitor going to the grounded pad and check the voltage across it on powering up.

**vikivng** · 03-21-2021, 01:29 PM

Re: SONY BRAVIA 40WE663 odd problem

Hi guys,
I didnt realise I had any responses.
nomoresonys,yes, the cap tests short out of circuit.
There was no change when I tested the set. I also tried a couple other caps from scrap boards.
Whilst looking at the board to find the same cap to test for matching, I realised there are 3 more of the same cap on the main board and 2 of them are testing short in circuit.
My question is (im sure it depends where on the circuit but..) would a mainboard with 2 shorted capacitors even boot the tv? Since sometimes the image does show for seconds.
Thnx for the replies guys im really trying to learn this craft.
Pls help me sort this set out.

**vikivng** · 03-21-2021, 01:35 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by dick_barton

Can you check if one of the pads that the shorted capacitor was connected to is connected to chassis (ground).
If it is then as a quick test I would solder a 10uF capacitor across the pads with the negative of the capacitor going to the grounded pad and check the voltage across it on powering up.

Hi, no connection between either pad and tv chassis.

**Questcom** · 03-21-2021, 01:47 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by vikivng

Thnx for replying.
this cap is testing short. I am assuming this should not be showing as such.?
Could this be the issue.?
Also getting 00v at both legs of that cap when power is on.
Looks like the culprit.?

looks more like a inductor to me and not a capacitor

**nomoresonys** · 03-21-2021, 01:49 PM

Re: SONY BRAVIA 40WE663 odd problem

If those caps on the mainboard are testing short with NO other boards hooked up to it, remove one and test it and also test the other one while still on the board, you need to track down this short.

**vikivng** · 03-21-2021, 01:49 PM

Re: SONY BRAVIA 40WE663 odd problem

here is a pic of the caps on the mainboard that test short albeit in circuit.

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**vikivng** · 03-21-2021, 01:51 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by Questcom

looks more like a inductor to me and not a capacitor

Aah interesting. Can anyone else confirm this part is NOT a capacitor.?
How would one tell the difference.Google images confirm they do look very similar.

**nomoresonys** · 03-21-2021, 01:53 PM

Re: SONY BRAVIA 40WE663 odd problem

Right, make sure it is a cap, you should see a C somewhere beside the cap, L for inductor. Ok, I see now that they are not marked at all.

**vikivng** · 03-21-2021, 02:01 PM

Re: SONY BRAVIA 40WE663 odd problem

Ok just tested again the 3 on the mainboard and they do all test as short so Im guessing they must be inductors.

**Questcom** · 03-21-2021, 02:02 PM

Re: SONY BRAVIA 40WE663 odd problem

tested out of circuit
good state: inductor should be short and capacitor should be open
bad state: inductor would be open and capacitor short (maybe discoloured due to heat)

**vikivng** · 03-21-2021, 02:07 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by Questcom

tested out of circuit
good state: inductor should be short and capacitor should be open
bad state: inductor would be open and capacitor short (maybe discoloured due to heat)

Makes sense.Good thing I kept the part as I will now resolder to the board.
Any other ideas as to what would give me image for secs then amps dropping then image goes away.?
Im not sure what to check now.

**nomoresonys** · 03-21-2021, 02:36 PM

Re: SONY BRAVIA 40WE663 odd problem

Well if none of the other caps on the driver board are reading bad, replace the bad one, it may be the only problem or did you already replace it?

**vikivng** · 03-21-2021, 04:59 PM

Re: SONY BRAVIA 40WE663 odd problem

well that cap turned out to be an inductor which has been replaced as it wasnt actually a faulty part.

**nomoresonys** · 03-21-2021, 05:58 PM

Re: SONY BRAVIA 40WE663 odd problem

Ok, here's what to look for testing the driver board, a video explains it a lot easier than words can: https://www.youtube.com/watch?v=Nh1ZjtI7KK8

**Questcom** · 03-21-2021, 06:32 PM

Re: SONY BRAVIA 40WE663 odd problem

Originally posted by vikivng

Makes sense.Good thing I kept the part as I will now resolder to the board.
Any other ideas as to what would give me image for secs then amps dropping then image goes away.?
Im not sure what to check now.

I'm still learning, but I was going to say check vone and voffe voltages should be around 30v and -8v and make sure they are stable

**vikivng** · 03-22-2021, 05:25 PM

Re: SONY BRAVIA 40WE663 odd problem

OK GUYS THNX,,
have been out all day but have watching all the videos I can..I understand a bit more now.
One thing I have to ask is pinpointing the various points relevant to the V labels.
Is there a general rule.
In the photo with the VONE LABEL do I test the small capacitor ? Or is it anywhere on that large track the label sits on.?

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**vikivng** · 03-22-2021, 05:28 PM

Re: SONY BRAVIA 40WE663 odd problem

VONE eg.

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SONY BRAVIA 40WE663 odd problem

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