LG 50PQ30 Heatsinks

[pposey]

Re: LG 50PQ30 Heatsinks

If that device burned, that will only usually occur due to a FET on the nearby heatsink going shorted.

Thanks Tom. I think i am going to part this one out. Do you know of a place to sell parts kind of quick other than ebay or is that my only option?

[tom66]

Re: LG 50PQ30 Heatsinks

I certainly wouldn't part out a plasma with only a damaged Y-sus, I'd sell the TV on as faulty or look for a new Y-sus.

[pposey]

Re: LG 50PQ30 Heatsinks

The thing is i think the control board is faulty also because the led on that has not been on since i have had this tv. And the test i performed to see if it worked the led would not flash. That is another $50 or so and the Y-sus is easily $70.

[tom66]

Re: LG 50PQ30 Heatsinks

And how much is a 50", 720p plasma TV worth in your area?
Control board might only light up if Y-sus is OK if it performs test of Y-sus on start up.

[pposey]

Re: LG 50PQ30 Heatsinks

Ok. i know its been awhile but i finally ordered a new y-sus from this seller on amazon stating that this was a new oem part. Anyway. i installed this and the tv still does not show a picture. There is sound but no picture. I checked all the voltages going from the power supply into the y-sus and everything is correct. I leave the tv on for around 30 minutes and the heatsinks will not warm up on either board but the power supply heats up. Anything else it could be or did i get a bad part? Thanks

[tom66]

Re: LG 50PQ30 Heatsinks

Do you have any voltage across the -Vy and Vsc testpoints on Y-sustain?

[pposey]

Re: LG 50PQ30 Heatsinks

Could you please explain this alittle better. Still kind of new to it. I see a VSC and VY on the board with a thing kind of looking like a resistor? I dont know if these are the test points. And what would you put your meter on to test these voltages? Does the tv need to be on or off?

[tom66]

Re: LG 50PQ30 Heatsinks

There's a sticker on the back of the plasma module marked "Model: PDP50K5#####" (for example) what is your model code? Note: not the same as 50PQ30.

[pposey]

Re: LG 50PQ30 Heatsinks

there's a sticker on the back of the plasma module marked "model: Pdp50k5#####" (for example) what is your model code? Note: Not the same as 50pq30.

pdp50g2####

[pposey]

Re: LG 50PQ30 Heatsinks

pdp50g2####

bump..

[pposey]

Re: LG 50PQ30 Heatsinks

pdp50g2####

Tom, sorry to bother you again. here is the number you wanted. Anything else you need to assist me?

[tom66]

Re: LG 50PQ30 Heatsinks

Ugh, completely missed your posts, sorry.

50G2 panel is included in this guide:


Page 93: Vsc/-Vy check/adjustment.
Page 98: Vzbias check/adjustment.

[pposey]

Re: LG 50PQ30 Heatsinks

Thank you! I will get back with you on this!

[pposey]

Re: LG 50PQ30 Heatsinks

Ok...on the z-sus board i did not have the test points like in the guide for VZbias. I did have where it had VZB to the right of the picture but not the top where it says VZB. I tested that spot just in case and i got 71.6 . Also i got the results VY- 189.3 and VSC 135.8.


i did these measurements with my multimeter set at dcv with a straight line and dotted line over the v.

[tom66]

Re: LG 50PQ30 Heatsinks

Do those voltages agree with the panel sticker? The Vzb sounds a little low -- would normally be in the 90 ~ 120V range.

[pposey]

Re: LG 50PQ30 Heatsinks

On the panel VZB is 85 VY is 188 and VSC is 138

[pposey]

Re: LG 50PQ30 Heatsinks

On the panel VZB is 85 VY is 188 and VSC is 138

Do i need to adjust the VSC also?

[pposey]

Re: LG 50PQ30 Heatsinks

Do i need to adjust the VSC also?

I adjusted the vsc but something just doesnt seem right about the VZB. I keep getting eractic voltages. I do not know if im measuring in the right spot or not. Would you like me to get you a picture of my Z-sus board to show me where to measure this at?

Ok scratch that. I did not see in the photo they said i can measure across C239 to get the reading which is what im doing but the voltages are everywhere.

[tom66]

Re: LG 50PQ30 Heatsinks

I would definitely look at Z-sustain then. Also, if you like, try comparing voltages with your old Y-sustain. You can leave the buffer boards out.

[pposey]

Re: LG 50PQ30 Heatsinks

I would definitely look at Z-sustain then. Also, if you like, try comparing voltages with your old Y-sustain. You can leave the buffer boards out.

With a bad Z-sus would that keep the Y-sus heatsinks from warming up? Because niether are warming up at all after the tv is on for 30 minutes.

I have another question, since the Z-sus is plugged into the Y-sus, does the Z-sus get its power from the Y-sus? I have not seen another cable that connects the Z-sus to the power supply.