Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Ok left it unplugged,and the unit,is it possible it's the fail safe circuit ?
Ok left it unplugged,and the unit,is it possible it's the fail safe circuit ?
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
I don't mind buying a power supply if I knew for sure if that's what it was?Comment
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Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Budm - dont know if you remember this one. Sanyo 46840 so different and not a felta board but similar problem.
https://www.badcaps.net/forum/showth...dp46840&page=4
Turned out Kevin had a problem with the Audio which was fed from the 24v and caused the whole thing to shut down - Any chance it could be the same on this?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
IM NOT GIVING UP ON THIS! HOW ARE WE GOING TO LERN ANYTHING IF WE JUST BUY A BOARD?SEEMS TO ME IF WE FIND THE BAD CIRCUIT THEN IT WHOULD BE A CHEEPER FIX AND WE COULD LERN SOMTHING IN THE PROCESS? So what should i do next?Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
First calm down.
This power supply generates the 24V and 12V using the same part.
It is considered essentially impossible for just the 24V to fail.
Some error must be being made somewhere, either in how we are directing you to test or in how you are testing.
Quick question, are you using DC200V to test 24V? Maybe your meter is over-ranging and you are seeing this as zero.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Hey,
I know I am late in the thread But I am having the exact same problem with my tv as well. It is the same model number the dp42848, So I am trying to keep up with the updates. I opened the back case and found all my boards to be brand new looking like they should be. I will keep following along and hopefully we can all solve this together. ThanksComment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
"First calm down.
This power supply generates the 24V and 12V using the same part.
It is considered essentially impossible for just the 24V to fail.
Some error must be being made somewhere, either in how we are directing you to test or in how you are testing.
Quick question, are you using DC200V to test 24V? Maybe your meter is over-ranging and you are seeing this as zero."
I cannot say it any better Tom. 12V is working, and as you can see in my diagram, there is not much in the 24v section. He will have to use scope to look at the AC waveform of the 24v windings to see if it is there.
I still want to use the lamps for verification for sure, but getting no where with my suggestion. I am out of here.Last edited by budm; 11-30-2012, 10:20 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
I will be working this afternoon,tonight i will try to post tonight,iI WILL FIND OUT THIS THING ONCE AND FOR ALL.i will start over square 1Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
To the original poster. At this point, it may be time to pull back and rethink things. I recently got a little over anxious and turned a few dollar fix into a 50 dollar fix all because I wanted to get out of my comfort zone without taking time to research. You may be better off storing this thing and keeping an eye on Craigslist for the same tv with a cracked panel for cheap. That way, you will have all of the boards to swap out one at a time until it is working. At that point, you may be able to recover some of your investment parting out what is left. Good luck.Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
First thing the tv is plugged in powerd on DOES NOT CUT OFF AFTER 3 SECONDS,IT WAS STAYING ON BUT NO BACKLIGHT...then with the tv on i whould probe the circuits,with the plug in the connector. Using the 20 d/c setting on my meter,THEN TESTED THE 24v circuit on the board 0 volts..and the lower wires on the plug had 12v 5 v ect BUT NO 24v,SO NOW AFTER INSTALLING THE BOARD BACK IN AFTER OTHER TESTING,the tv SHUTS OFF AFTER A FEW SECONDS?WHY I DONT KNOW!!Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Please stop using capital letters are you using a pad? If you test 24vDC with the meter set on 20vDC depending on the meter it might show as 0 as it is overscale/ out of rangePlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Sorry about caps.... I will change my d/c voltage setting on my meter..its more than likley wrong..will get back..will start overComment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
I talked to a friend that works on tvs he told me that its going to be 1.the power board or slave invertor...he has seen this over and over...so im going to let him look at the power board tonight..i will post a s a p...Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Finally after over 100 posts,
I think selldoor figured out the problem why it is not showing 24v on the meter, if he put the meter in 2v scale and try to read 12v output, I would think it will report wrong reading also. I believe now that the 24v is OK. Do not understand why it is set to 20V scale when you are trying to measure 24V.Last edited by budm; 11-30-2012, 06:40 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Ok i have a 24 volt power supply how do i use it to power up the invertor?Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Im going to use a diffrent meter,i have tryed 2v 20v 200v no voltage is output i may have a bad meter or i have no 24v output?Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
You need a 24V, 8-10A power supply... if you have one, then provide 24V and connect INV-ON to 5VDC and DIM to 5VDC. [per TOM66]
I guess your friend didn't say anything new?
If you want to test your meter you have a reference with your powersupply for 24v.....at least human error is almost completely ruled out that way.Last edited by drpj23; 12-01-2012, 12:34 AM.Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Note -- Do not try to use a truck battery. They put out 28.8V, the inverter will most likely shut down due to over-voltage protect.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Sanyo dp42848. No picture no sound?has anyone found the problem
Sorry getting back so late,my tv friend was not home yesterday,i am gonna try sunday,i goin to work today.im going to test the slave invertor tonight. Im not sure were the circuits are located? On the board?can you let me know were to attach the 24v so i can power backlights? Ok thanksComment
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This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.
Problem
TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode... -
Hello,
I have a just of warranty 70" Samsung 6-series that out of the blue stopped getting a picture, but I had sound. During the initial outage, the picture came back momentarily and then faded out. The next morning the TV worked on a quick test, but trying it again later it didn't.
When I have the mainboard disconnected from the power supply, the TV powers on with full LED brightness and stays on
When I plug the mainboard in, the LEDs go bright-->dim--off -->repeat, while the red status indicator blinks 2x
WORKAROUND: Unplug one... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello, Last week I bought the 50" Sony X80j tv everything was working fine, untill I plugged the tv in a ups power supply 650va the tv remote control became unresponsive and the TV became laggy after a while the picture quality isn't the same as before the tv seems less brighter and the picture is somehow blurry, people's faces don't look as natural as before, there is a mini orange-pink tint to the edge of people's faces especially in NETFLIX Dolby Vision like in One Piece ep1 Alvida skin tone, my intention was to protect the tv but something went wrong I checked the ups with a multimeter,... -
Hello, this is my first post on this forum, and my first attempted to repair a TV.
My Philips 58PUS7805/12 stopped working recently. It is not that old, about 5 years. We were on a trip for a few days and when we came back, it had stopped working out of a blue (Perhaps our house was hit by a lightning strike? Don't know.)
Read from a guide that I should test if the screen shows picture with one of the T-Con cables disconnected. Did that, it showed perfect picture (first on left, later on right side).
Read also that we should test what happens if we...
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