Lg 50pk590

[Hamie]

Re: Lg 50pk590

Without the buffer connected, then if they all match.

[diif]

Re: Lg 50pk590

-vy = -185.3v
vsc = 151.1v
Zbias = 109.8v
Similar results with the buffer connected.

[Hamie]

Re: Lg 50pk590

Are all voltages permanent or is the tv going back to standby?

[Hamie]

Re: Lg 50pk590

Do those voltages match your panel sticker?

[diif]

Re: Lg 50pk590

I plug the tv in and press the power button on the remote, i hear two clicks and the voltages are there all the time. Yes they match the sticker.

[Hamie]

Re: Lg 50pk590

if all the voltages are there all the time the tv can't be going back to standby?

[diif]

Re: Lg 50pk590

Yes, you are correct, two clicks, the standby light goes off and i hear a buzzing sound.

[Hamie]

Re: Lg 50pk590

Ok is the panel glowing?

Is there an LED light on the small control board?

[diif]

Re: Lg 50pk590

The panel glows for a split second when i take it out of standby but then goes back to a dark screen.
The LED is flashing, long flash then short, then a pause and repeat.

[Hamie]

Re: Lg 50pk590

Ok disconnect the LVDS cable from the main board and control board.

Then locate 2 holes marked ext auto gen on the control board an put a wire jumper across them.

[diif]

Re: Lg 50pk590

The LVDS cable being the silver one going left to right ?
I am struggling to find the 2 holes you mention.

[Hamie]

Re: Lg 50pk590

Unfortunately I can't find any service manual for this set.
If you plug in a DVD player via scart, do you get sound?

[diif]

Re: Lg 50pk590

I tried with a signal from my cable box and got no sound.

[Hamie]

Re: Lg 50pk590

I still find it strange that the panel doesn't glow considering the y-sus is performing normally.
Are you sure the panel isn't slightly lit up? Darken the room.

Imo if you are sure that you are on a cable station and you aren't getting sound then it's probably a mainboard fault. But that still doesn't explain why the ysus isn't lighting up the panel.

[diif]

Re: Lg 50pk590

Cheers Hamie, I shall try tonight when its dark as I don't have thick curtains.

If I find it is still slightly lit, what will that indicate ?

[sordids999]

Re: Lg 50pk590

Found this so might be a idea to check

One typical failure symptom of a failed power supply board is a TV that has a standby power, but upon attempting to turn TV on it clicks on and quickly back off, never actually turning on and staying on.
An open fuse F302 or shorted diode D304 (located on the right side of heat sink HS2 toward the middle of the board)
At the time of this listing's creation the kit contained 1 fuse (F302), 1 diode (D304) , two power resistors (R927, R929) and the IC301 voltage regulator IC.
Contents may change as we gain more experience and see other commonly failed components and this listing may not necessarily be timely updated

[diif]

Re: Lg 50pk590

Now it is dark, i can see a feint glow from the screen.
I have just checked the diode and fuse and they are ok, so i've ordered an ic and i shall see what happens.

[diif]

Re: Lg 50pk590

I have replaced the ic this morning, however i still get two clicks, the panel is white for half a second then dims.
The LED on the control board has a different flash pattern now, 3 short followed by a long one.
Whilst i am looking for some documentation to identify this flash code, can anyone shed any light as to what it indicates ?

[Hamie]

Re: Lg 50pk590

I have replaced the ic this morning, however i still get two clicks, the panel is white for half a second then dims.
The LED on the control board has a different flash pattern now, 3 short followed by a long one.
Whilst i am looking for some documentation to identify this flash code, can anyone shed any light as to what it indicates ?

this is normal for the tv.
its always done this but you probably just havnt noticed it.

what do you mean by you replaced an IC?

[diif]

Re: Lg 50pk590

I bought a replacement part IC301. It was the only part in the repair kits i hadn't tested as i was unsure how.