Lg 60pa6500 black spots on tv

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

Test the buffer boards for short-circuit on the output pins.
It takes some seconds for the screen to fully recover from these black spots when the sustain issue is solved.

The other tv you bought works fine except for the HDMI?

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Okay so I was able to find a parts tv. Bit I'd like to fix both. So I know what's wrong g with the one I got today the main board had the hdmi component ripped off. I tried swapping a sustain boards and it did the exact same thing. So it's not the z sustain, power supply or?

[RJARRRPCGP]

Re: Lg 60pa6500 black spots on tv

Here's the z sustain board , does it look like theres anything wrong thanks in advance

I see 2012, week 50!

[petehall347]

Re: Lg 60pa6500 black spots on tv

you can just desolder the legs and lift them up a bit .

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Thanks if I desolder it I'm just going to change all of them as theres only a few, with new ones, where can I find these ? Do I just search for smk0825 , RJP30H2A and SF20D400SD2 ?

[dick_barton]

Re: Lg 60pa6500 black spots on tv

You can check SF20D400SD2 as Biruslapio says since they are dual diode pack which your meter can test. Unfortunately the best way to test them is if they test short on the board to desolder them and test again.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Heres pics of the 3 different components and the writing on them . Where can I get these? Thanks also is there something else i should check?
Thanks

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

You got some part numbers wrong. For q302, q281 and q282 is SMK0825, an IGBT.

RJP30H2A is an IGBT, nothing comes up with RKP30.

SF20D400SD2 is a diode.

If they are suspect of being shorted, then they have be desoldered from the board and tested off-circuit.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

There low and fluctuating alot compared to the others around 200 and fluctuates
Q302 auk b2c25 smk0825
Q282 auk b2c25 smk0825
Q281auk b2c25 smk0825
Where do I find them? And the other types on this are
Rkp30h2a 4p 026 and auk b3103 sf200400sd2
Thanks

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

What are those weird readings?

Anything below 500 ohms is a problem.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Thanks I used my multimeter I get weird readings on q302 , q202, and another one , is there something else I should test ? I know I should change those ones
Thanks

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

yes, use the ohms scale.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Good morning, I've been looking for my other multimeter but moved and can only find this one, will this one work?
Thanks

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

If you don't have the means to repair it, might as well buy a replacement Z-Board, it all points to it, the rest of the screen is properly displayed, and these black spots are a sign of a bad Z-SUS, it is cheap in my country, but may not be at yours.

If it's expensive and you want to repair it youself you need to probe with a multimeter the components I pointed at #16.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Thanks. It doesnt look like theres any known cold solder joints, has anyone had this issue before?

[Biruslapio]

Re: Lg 60pa6500 black spots on tv

Check resistance between the IGBTs, those 5 pin optocouplers, there can be no shorts between any of the pins of these 2 types of components. Low value resistors are also worth testing, they go open if a short occours in series with them.

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Is there a way to test and repair it, I'm assuming you had this issue as well? Thanks

[chrismurphy]

Re: Lg 60pa6500 black spots on tv

Z sus is faulty just replace

[pansatdishman]

Re: Lg 60pa6500 black spots on tv

Here's the z sustain board , does it look like theres anything wrong thanks in advance

[RJARRRPCGP]

Re: Lg 60pa6500 black spots on tv

Its plasma tv made in 2014

A very-late one! I still wish I was able to snag a pristine one of those!

The closest we have, is one built in 2009, despite an excellent picture on ours, there's faint black spots, especially on the right of the screen, seen when it's all white on the screen. Is this a symptom of a hardware problem? I don't know right now. It honestly resembles dead LEDs on a recent LCD!