I have a Vizio p50hdtv10a, what is the proper way to test the ic's on the buffer boards? I have put meter in diode mode, grounded on buffer board then ran all through the pins connecting to the panel. I have gone through 2- y sustains, it works for about a hour then starts flashing screen. So its gotta be the buffers shorting out the y boards.
vp50hdtv10a Buffer testing
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Re: vp50hdtv10a Buffer testing
Samsung panel? In which case it's unlikely to be the buffers but the power supply going crazy. We are seeing another TV with same symptoms. Nominally 200V output measuring more than 300V! This probably kills the Y-main in short time.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: vp50hdtv10a Buffer testing
Its a LG panel, voltages are all good. I even thought of the power supply also, replaced with different power board after first y board went. Did the same thing after about a hour. Its destroying the Ipms some how.Comment
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Re: vp50hdtv10a Buffer testing
Check the Vs to be sure. It's pretty rare for IPMs to die from failed buffers on an LG.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: vp50hdtv10a Buffer testing
-Vy looks too low to me. Should be close to -200V. Can you post a picture of the plasma panel voltage sticker?
Also, you need to check Vs when the screen is flickering.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: vp50hdtv10a Buffer testing
All of these readings are with a good Y main installed, sorry I didnt tell you that, Im just trying to get this figured out so I dont blow another. Only running the set for a few seconds at a time to test. I will get the picture of the voltage sticker.Comment
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Re: vp50hdtv10a Buffer testing
drp, you are right the -vy is -199, the vsc is 114. Wouldn't I need a scope to adjust the vsc?Comment
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Re: vp50hdtv10a Buffer testing
I think you need to get -Vy first. -Vy is important for erasing the display, pixels will get stuck on without correct -Vy.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: vp50hdtv10a Buffer testing
Alright -vy is up -200, +vsc 120. Should I just go for it and run the set, these y boards are so expensive. Nothing else I need to test?Comment
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Re: vp50hdtv10a Buffer testing
Just run it.
As SOON as it starts flickering, cut it off.
If it doesn't short then, no damage done.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: vp50hdtv10a Buffer testing
So far so good, but I am getting red and green sporadic pixelation ONLY in the upper left hand corner of the screen. I know the tv is 6 years old, have seen it on numerous plasma sets. But not in just one corner.Comment
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Re: vp50hdtv10a Buffer testing
Yeah, that indicates incorrect Vsc or -Vy, or Setup/Setdn timings, as it ages, you may need to tweak these voltages slightly but NO more than 10V should be necessary.
Sometimes it cannot be resolved without firmware updates made to the control board.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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