Re: Sanyo DP50747 no video
Sorry for the long delay posting again.
Attached are photo's of the bottom section of the Z sustain board.
Not sure if I should try spending some cash on a Z sustain or try parting out the good power board, control board etc. or just scraping the set?
From what I can tell this Sanyo model had high failure rates which makes me reluctant to spend on it.
I don't need another 50 inch Plasma as I already own a newer LG myself but my son would have liked this one if it could have been fixed by replacing a few caps.
Thanks...
Tproveau
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Last Activity: 02-16-2012, 02:57 PM
Joined: 02-02-2012
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Re: Sanyo DP50747 no video
Would the output voltage be the voltage sent to the plasma panel?
Got to head to work now. Will try and post a photo of the bottom of the zsus in the next day or so.Leave a comment:
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Re: Sanyo DP50747 no video
Would the exsessive load or bad cap be problems on the zsus board or elsewhere? Also would the low voltage cause no video on the whole panel like I have?
Thanks
P.S. I have been building and repairing PC's for 17 years now, much easier than this plasma troubleshooting. With the PC I keep extra working components around for testing and swaping out, with this TV, I would need another whole TV of the same model at least! I admire your troubleshooting skills in such a challenging sector!
TerryLeave a comment:
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Re: Sanyo DP50747 no video
Checked voltages on Y sustain board and adjusted up a bit to specs.
Checked Z sustain board, is at 65v should be 100. Adjusted up to 85 which is as high at it will go. No change to TV still no picture. Took Zsus board out to visually check for burns, bad caps etc. Can see no problems visually. Incoming voltages to Zsus board are right on spec. Bottom of board is slightly greasy to the touch on most of the surface, eneough to hold a finger print. Could this Zsus board be the culprit. Could there be more problems as well?
I always preferred...Leave a comment:
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Re: Sanyo DP50747 no video
Well I unhooked the LVDS cable and shorted pins 1&2 on the 4 pin connector as seen in the LG training manual and nothing on the screen. Tried the other pins as well, still nothing. There is a slight hum sound when shorting the pins so it's probably trying.
The YSUS and ZSUS boards both have a low humming sound with the YSUS being slightly louder than the ZSUS and heat sinks are warm but not hot.
Found the surface mounted fuses now and all check out good.
So I think the power supply, filter board and sanyo main board are all fine...Leave a comment:
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Re: Sanyo DP50747 no video
LG 50PC1DRT Troubleshooting Manual 2007 VG Training was no longer on electrotanya however I found it on 4shared.com easily.
Will be reading them shortly!
thanks again Bill.Leave a comment:
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Re: Sanyo DP50747 no video
Thanks Bill. I will get those and have a look....Leave a comment:
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Re: Sanyo DP50747 no video
Some more info. I hooked up a dvd and changed the input to AV1 which the dvd is hooked up to. Got clear audio but still no picture. All voltages on all boards where connectors hook up have been tested and are correct.
Any ideas?Leave a comment:
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Re: Sanyo DP50747 no video
Further info re: testing
I found this info (1) but cannot find the corrosponding auto gen pins etc.
Also not sure what the VLDS cable is. Sould it read "LVDS" low voltage differential signaling cable?
(1) "on the contol board look for "auto gen" it could be 2 point on circuit board
or pin 1 & 2 of a 4 pin plug -- unhook the VLDS cable and short pins -- if
screen goes thru colors and checker board pattern - the y-sus ,z-sus and
control board and PDP panel are good"Leave a comment:
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Re: Sanyo DP50747 no video
Yes that is the power supply.
I just tested it with all connections, connected and all the voltages are in the correct range.
VS 193.0 VA 58.0
the other 12, 24 and 5 volt connections were close like 11.7, 23.6 and 4.5
I was trying to measure them disconnected and I think the set kept turning off when the connections were unhooked so I was getting what was left in the caps I guess.
Sorry I am so new to this.
So power supply looks great actually. Set does stay on when all wires are hooked up to the power supply board....Leave a comment:
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Sanyo DP50747 no video
Hi. I have read all the posts regarding this model TV and I cannot seem to figure out what is faulty on my DP50747.
mine has the Chassis # p50747-01
I have no video at all, no lighting up of the screen when switching on power. The green power led comes on and stays on.
I do have audio and the change channel seems to be working as the audio is heard switching every time I change channel.
I have photos I will be attaching to this thread.
I cannot find any faulty looking capacitors on any of the boards.
I have repaired caps before on several LCD monitors... -
Re: New Members - please post your introductions here
Hi. Just registered and first post. Hope this is the correct place to post?
Trying to repair my Sanyo dp50747 no picture tv. Will search the forums for help.
Thanks for being here.Leave a comment:
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