Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Put the oscilloscope on the outputs of both zsus fet driver schips.
One is show busy square wave.
Other is a flat line. Assuming the flat one is faulty.
Ordered a complete repair kit. Will post results later.
jwarnes
Member
Last Activity: 10-10-2016, 01:46 AM
Joined: 02-20-2014
Location: queensland
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Yes all voltages perfectly stable.
Im going to try changing the fet driver controller chips (8 pin) next. Since the zsus boards are not available anywhere.Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
No one has any clue??
No gurus??Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Well i did that test today. None of the voltages change when i change the brightness and contrast.
So im stumped. Anyone???Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
This is my thought also. Today I will test all the voltages and see if any of them change during the menu testing.Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
1 cable and yes i removed it and cleaned it today.
What about one of the driver chips on the back of the z sus board that drive the fets. Could a blown driver chip make it do this problem?Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
If it has to be a zbias fault then what could it be if the dc voltage is correct? A timing issue? Is the zbias voltage a smooth dc voltage or should it be pulsing?Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Ive noticed the image is not good in normal mode viewing tv. Then if I go through the menu its still no good....untill that is when I get to the image wizard adjustment section where it goes to change the contrast. Two pics attatched. First one before and second pic after it suddenly switches to a vastly improved but not perfect picture.
Then upon exiting the picture wizard it goes back to extrememly poor picture and heaps of ghosting.
And I watched the vzb voltage through this. It didnt...Last edited by jwarnes; 09-15-2016, 05:53 PM.Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Test pattern images attatched...Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Theres a pot on the Y board that says (SET-UP)
What is that for?Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Is this the area i need to pay attention to?...Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
So I've played with the TV picture settings in the menu and found it is greatly improved if i turn up the contrast to maximum.
Ive repaired the zbias before and its running in spec which is why i don't think it is a z bias problem this time.Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
I will retest all the voltages and put them up.
Vs 203.1v
Va 55.1v
Vzb 110.3v
Vy -179.9v
VSC 149.5v
M5V 5.15V
And if i change vzb up to 115 or down to 105 picture does not change.Last edited by jwarnes; 09-15-2016, 04:50 PM.Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
Thank you. Reevey can i just confirm with you first the correct way to measure the zbias?Leave a comment:
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Re: Another 60PV250 pic fault but different this time. Help greatly appreciated
How do you put this one into test pattern?
I cant see the 4 pins?
Photo attached...Leave a comment:
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Another 60PV250 pic fault but different this time. Help greatly appreciated
Had this one a while now. Great tv. Had usual bad inductor solder joints on Z board repaired with new fets and caps etc. Ran perfectly fine for another year! Then this new picture problem emerged. Checked all voltages and usual problems all good yet pic is still trash.
Have a look at the photos.
I cant figure out the reason for the black splotchy patches.
It would be ok then appear when the tv warmed up.
I have not mucked about with the Y board or buffers too much because the voltages all seem ok and the picture is mostly there.
Does anyone have any clues what's... -
Re: LG 60pv250 no picture with sound
I feel your pain. Mine is doing the same.Leave a comment:
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Re: 60PV250 LG picture fault
common yes. I have one right now I'm trying to sort out too. Seems if the IGT's are ok but have different forward voltages it will still blow. Very stressed part of the electronics of this tv.Leave a comment:
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Re: LG 60PV450UA is this a bad Plasma Display
yes. STill have them?Leave a comment:
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Re: LG 60PV250 Plasma
Did you get this problem resolved?Leave a comment:
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