Re: LG 50PA6500 no picture
This morning the two Y buffer boards (YFRVTP & YFRVBM) arrived from Good Point Recycling; Middlebury, Vermont. Their prices are hard to beat (ebay, $29.99 + tax, free shipping). Both boards passed a continuity test for shorted ICs. Installed the top YDRVTP only, since I know the bottom board is working.
BEAUTIFUL PICTURE ! You can't beat these old 1080p plasma sets for image quality. I am a happy camper.
As a reference I have the following voltages of this working set without any input video:
PSU:
VS =...
jagu3090
New Member
Last Activity: 01-11-2020, 10:16 PM
Joined: 12-17-2019
Location: Kentucky
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Re: LG 50PA6500 no picture
@ ajshoe
I am in South Central Kentucky, near Bowling Green. The board with the blown chip is the top Y-buffer board YDRVTP with these two part numbers:
EAX-64300101 REV 1.1
EBR-73763902
The bottom Y-buffer appears to be functional and this YDRVBT has these two part numbers:
EAX-64300301 REV 1.1
EBR-73764302Leave a comment:
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Re: LG 50PA6500 no picture
@ nicholas1110:
Okey dokey. Thanks for the tip!
The top two or three orange ribbons are intact! Where the ribbons may contact the metal there is a soft black felt like material glued on the metal. So you can say I consider myself to be very lucky.
To be able to perform this check you first have to remove one screw at the top-middle, from the back side of the TV. (Took me a while to figure this out). This screw has an arrow in the metal pointing at it.
I can either attempt to solder a new chip (PN R2A20299FT)...Leave a comment:
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Re: LG 50PA6500 no picture
So now I have removed the top Y Buffer and turned my TV on. Now I get the CONTROL's ext_gen_test on the screen as it cycles through it's test patterns, but only on the bottom half of the screen.
My voltages at the Y-SUS are now:
VS = 190 / actual = 189.9
VSC = 150 / actual = 150.8
On this upper Y-Buffer board I tested for shorts from the Y-SUS connectors to the orange ribbon connectors. There are about 14 pins in a row at the topmost orange ribbon connector that are shorted. The top IC looks as good as the...Leave a comment:
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Re: LG 50PA6500 no picture
I have located a voltage called VZB on the Z-SUS. It is across resistor R412 (another 220k Ohm resistor) and this voltage is a rock-steady 149.5 VDC.Leave a comment:
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Re: LG 50PA6500 no picture
I have been able to locate the VY and VSC voltages on the Y-SUS. VY is available cross R272 and VSC is available across R273 (both resistors are 220k Ohm 5%).
VY / actual = bouncing periodically between 25 and 27 VDC per analog VOM.
VSC / actual = bouncing periodically around 2 VDC per analog VOM.
My DVM does not have an analog graph scale, so the digital output is garbage varying all over the place. The analog VOM is 50k Ohms/V, so the 220k resistors are now paralleled down to around 202k Ohms. Just sayin'....Leave a comment:
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LG 50PA6500 no picture
Hello, I have an LG 50PA6500 Plasma TV, purchased new on June of 2012.
I am willing to climb tall mountains to get this plasma TV fixed since the picture on this TV has been absolutely gorgeous and this is a 1080p (not a 720p).
I have an old-school Tektronics dual trace 60Mhz scope (if it comes down to that.)
When I connect the power cord to 120 VAC I get two relay clicks from a black relay RL103 located near the bottom edge of the PSU. When I turn the TV on (either with remote or hard power button) I get one relay click from the same relay.
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Re: New Members - please post your introductions here
This is my first message/post on this board. I will be posting about an LG 50PA6500 PLASMA TV, as soon as I figure out how to post. I had a career as a bench repair tech. AFTER this career I went back to the university to finish what I started thirty years earlier, a EE degree from WKU in Bowling Green, KY. (Just because.)
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