I had a question about a dp50747-01 Sanyp plasma TV. I'm getting the typical "powers on then relay clicks and it shuts off". I replaced 9 bad caps on the power supply board that now I get a brief flash of the screen before it shuts right back off...it didn't do that before. I'm looking at the 4 led lights on the logic board and am not sure what they mean. They are labeled as D2 through D5. When I initially power it on, they all light up, then all go out but D2. After a few seconds along with the relay that clicks and it powers off, D2 goes out too. I get these symptoms over and over. Any insight?
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Re: DP50747 Question
A quick update to this as I had a couple of details wrong before...it is D3 through D5 that light up and go out, D2 is never lit. Does anyone know what D2 represents?
Also, I've tested the power supply, Vs is getting the correct voltage, but I'm not getting anything on Va at all. I'm still getting a slight flash of the screen each and every time I try powering on. Any suggestions? I appreciate the help! -
Re: DP50747 Question
Ok have a DMM?Comment
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Re: DP50747 Question
No, I only have access to an analog one at the moment. Is there any simple testing I can do with it until I can get ahold of a digital one? Curious what it means when you don't get any reading off of the Va.Comment
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Re: DP50747 Question
Sorry time of night, obviously as you have checked voltages already... < not so obvious!
Voltages at K7H and K7J on PSU?Comment
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Re: DP50747 Question
Let me look around on the board, do you know where abouts I might find these points? Will it be a pin or on a diode or something?
Totally appreciate the help!Comment
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Re: DP50747 Question
Connector from filter board, Throw some pics of the boards and chassis and I will point them out if neededComment
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Re: DP50747 Question
Here's a picture of the board, I see the points you're talking about, but there are no connectors in place there.Attached FilesComment
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Re: DP50747 Question
Different revision of board.
Ok lets test voltages on main board for the Power Fail Circuits...
Picture of main boardComment
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Re: DP50747 Question
OK, here are a few pictures that may help. I currently have the power board still mounted, let me know if you need me to get a picture of the full board.Attached FilesComment
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Re: DP50747 Question
Very hard to see with these pics.
Need them clearer so we can see reference printing on the boards... so good high resolution with good focus.Comment
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Re: DP50747 Question
Its 5 am here and Mrs is moaning about the time so look over these....Attached FilesComment
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Re: DP50747 Question
Sorry about that, would this one help?Attached FilesComment
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Re: DP50747 Question
Here's pics of the Ysus, Zsus & the left portion of the power supply board (since it's still mounted in the TV).Attached FilesComment
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Re: DP50747 Question
Thanks for the reference manual, it looks like I'm getting 5 volts at pin 32 and nothing at pin 36 (if I'm reading that right that I'm supposed to be testing 36 too).Comment
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Re: DP50747 Question
Which connector?Comment
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Re: DP50747 Question
OK, I tested all of the points that were referred to in that manual you sent me, and the only 2 things that didn't come back correct were the pin 36 on the IC801 CPU (pin 32 was correct, and I'm not sure if I was supposed to get a reading on pin 36) and also the D1621 on IC1620 is coming back at about 7 volts (instead of 33v). These were all tests on the Power Failure Circuit page. I did notice that there was no chip in the D1683 spot (on K8B at 12V) but I did measure the little solder pad that was in its place and got about 5 volts (the manual said I should be getting 12V).
I believe I'm testing these right...black lead on ground and red lead on the chip's solder point, like D1621.Comment
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Re: DP50747 Question
Will take a look through when I get back laterComment
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Re: DP50747 Question
Can you take some close up pics of all the connectors on the PSU so i can see the reference labels next to them pleaseComment
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Re: DP50747 Question
Are you talking about on the foil side or the component side? I'll upload what you're looking for this evening.Comment
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Hello,
I have been reading a few threads on here regarding Panasonic plasma tv's. I've found one thread which explains the same problem as mine, unfortunately the thread has not been completed.
I got a free tv (TH-50PX8EA) from a friend which shows no screen. When plugged in only one red light shows up and when pushing the ON button, the red LED turns of and will only turn on again when pressing the ON button again.
When plugging in the TV i hear two relays click fast and after a few seconds the third relay clicks.
I have measured the voltage in the VSUS line, which...06-18-2024, 12:58 PM -
I got this TV a little over a year ago from a coworker from my previous job. It’s a Samsung 46” TV, model number LN46b530p7f.
Problem:
Backlight cycles On and Off.
Basically, when the TV is turned On, there is a relay click heard from the TV PS board. The relay cycles On and Off 4 times in about 2-3 second intervals. Each of those 4 times, the backlights also cycle On and Off with the relay. The screen TFT isn’t cracked/damaged and appears to work - I can see a “no signal” image when the backlights turn On briefly – though the image is a bit dull/dark.... -
Hello
The red and green LEDs both light up and you can hear the relay click. (no picture, no backlight, no sound)
2-3 seconds later the relay will click again and only the red LED will stay on.
I would be very grateful for any advice or a little help.
circuit diagram?
Thanks very much -
Hi, I'm seeing one 9V relay having temperature 40C on its 9V (primary) side. Does that seem right? I switched 2 relays on that board and the temperature was the same (on the same position), so I'm sure it's not a faulty relay. I measured voltage on that relay and it was 9.5V DC, so that looks good. I don't see any other relay on that board having that kind of temperature and they have 9V on them too.
I thought maybe the transistor that is switching this relay keeps switching on/off, so I also checked for AC and there was almost none: 0.3V using mV range. No steady frequency was shown, but... -
Hi everyone!
I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
I respected the polarity, positive to cathode of protecting diode
So provided all...
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