Re: LG 42PC1D No Video
Checked all the voltages and bias on both Y and Z boards and all were normal.
PSU also OK.
What about the X board?
Have not seen any spec for that!
Would the X board cause this issue?
Also noticed when the test pattern changes, there is some lag when going from dark
to bright image (the dark pattern seems to take a bit to lighten up).
Really do miss good old CRT's and analog video!!!...
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: LG 42PC1D No Video
Set has seperate X, Y and Z boards.
Beginning to look like a defective panel to me!
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Re: LG 42PC1D No Video
Just the last part of the procedure as I knew the PSU was good.
Thanks for that tip.
Did check the Z board and all voltages are good there.
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Re: LG 42PC1D No Video
Got the test pattern finally and does not look good!
Rather blotchy picture....
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Re: LG 42PC1D No Video
Unfortunately incomplete just like all the other schems out there!
Does not show the complete picture.
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Re: LG 42PC1D No Video
OK, Jumpered pins 3 and 4 on auto-gen header with and without LVDS cable connected. Still black screen! The only difference noted was that LED 1 and 3 came on in the CTRL board rather than LED 2 and 3 without the jumper. They are outlined in red....
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Re: LG 42PC1D No Video
Finally got to that TV and found the auto-gen, problem is that it is a 4 pin header and not sure which pins need to connect....
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Re: LG 42PC1D No Video
Thanks Andrew, will try that tomorrow.
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Re: LG 42PC1D No Video
No glow on the panel at all Wilderone.
Yes I agree that red is bad. All the power rails are at spec and clean DC.
If only could find a service manual on this, would help greatly.
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Re: LG 42PC1D No Video
All voltages at normal rating! Scoped the Ysus driver and Zsus boards and all signals appear normal. I do however have one red LED on the logic board (all others are green)....
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Re: LG 42PC1D No Video
Anyone have some input to this problem?
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Re: LG 42PC1D No Video
OK, Just scoped the Y outputs and there is signal there with -Vy @ 200v, VSC @ 120v. On the Z board, signal also scoped with a Z-bias of 100v and no picture on the screen. Is it possible the sacreen could be bad?
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Re: LG 42PC1D No Video
Can the Ysus board be checked without the drivers connected? Need to measure voltages at different pinouts to verify IPM!
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Re: LG 42PC1D No Video
Wouldn't the IPM be working if VSC and Yv are there?
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LG 42PC1D No Video
Got a LG 42PC1D with no video display!
Va and VS are normal and assume that Vy of 122v and VSC of 188V is normal also (might have those mixed up). Z board seems to be working as well.
So why no picture?
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Re: New Members - please post your introductions here
Greeting from Michigan.
Started out with a tandy mod 1 back in the 70's, then to a tandy mod III, Tandy coco! By the 80's, moved up to Amiga 500, 2000 with toaster and still have most of these around. Broadcast engineer by trade, Musician by nite (plus keep all the other musicians equipment running.
Loving this site more everyday!
Keep up the good work!!!
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