Re: LG 50PV450 no video
Looking at the signals on the 4 plug connectors between the y-sus and y drivers I see the following:
On the top expected 10.9VDC and saw 10.8VDC. On the other 3 connectors, I expected Vscan as 107VAC (~350Vp-p). On the middle 2 connectors, Vscan is a steady ~140VDC and only on the bottom connector do I see a waveform similar to that shown in the training manual. I removed the y drivers and saw the same signals.
So shouldn't I see the same Vscan on all 3 connectors? (Input was none - static on screen)
(y-sus is from paylesscomponents and...
jb_gt_84
Repair hobbyist
Last Activity: 01-11-2014, 11:05 AM
Joined: 12-27-2013
Location: Atlanta, GA
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Re: LG 50PV450 no video
The label on the monitor shows 150 for Vsc but it's pegged at 144.5V
PS I have borrowed a scope for the weekend.Leave a comment:
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Re: LG 50PV450 no video
I hear a hum from both the Y-SUS and Z-SUS but not a ticking.Leave a comment:
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Re: LG 50PV450 no video
Pdp50r30111Leave a comment:
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Re: LG 50PV450 no video
The y driver boards came from ShopJimmy.
They say they are new.Leave a comment:
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Re: LG 50PV450 no video
The lower y driver has a ribbon cable and 2 plugs that connect directly to the Y-SUS.
I found a service training manual for this TV and it says not to operate the Y-SUS if the ribbon cable is removed, but the y-driver is plugged to the Y-SUS. If I remove the lower y driver, I don't have that ribbon connection to the upper y driver, so it seems this is something I should not try?Leave a comment:
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Re: LG 50PV450 no video
So finally got y driver boards and installed them.
I now have a picture!
But it's not very good! 
Am I correct that the Z-SUS is bad based on the pixelation?
The bottom half also looks like the y-driver is bad, but it's a new board as is the Y-SUS. Could the previous bad y-driver have damaged the Y-SUS or did I get a y-driver or Y-SUS that was no good?
Thanks!...Leave a comment:
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LG 50PV450 no video
Hello all,
I have a LG 50PV450 Plasma TV that was given to me. The manu date is 11/2011.
It has audio but no video. The Vs, Va and 5V from the SMPS look OK. On the Y-SUS board, the Vy- signal jumps to approx -190V then decays back to -25V at a 800ms duty cycle. So I figured the Y-SUS board was bad and replaced it. However, I still get the same results. I removed the Y-BUF boards and now see a steady signal on the Vy (-190V) and Vsc (150V) per the unit label. So are the Y-BUF boards bad? I'm thinking I should replace them as a set, correct? Thanks in advance for your help. -
Re: Lg 50pv450
Hi, I'm a newbie who also has a LG 50PV450 w/ this same problem.
I'm also curious about a resolution.Leave a comment:
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