hi all.i found a Panasonic vierra in the trash and i found the sc board was short ,then i test the buffer=2.5m ohm so that ok i think now i found on the sc board d865 q401-402 q421-422-423 and q661 was shorted ...now im here ....anybody ave sucess repair this board....(sorry may contain error im a french dude) im waithing for part to arrive
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Last edited by tipat; 01-06-2014, 11:16 PM. -
Re: try to repair 50" panasonic "tnpa4782"
first i ave the 10 blinks, after board isolation it go 6 blinks=su-sd/sc board in the troubleshooting guide .....when i unplug the sc board only, the vsus go to 200v then drop slowly to zero and the green led is on ss board ,that tell me my ss is ok if the sc board is plug =no voltage at all each side and no light on ss board -
Re: try to repair 50" panasonic "tnpa4782"
I have a Panasonic 50px80a it does two blinks I believe its the 15v cap on the power board with the back off I plug it in there are two clicks followed by one more on the power board how do I find which part I need to replace ? cheers in advanceComment
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Re: try to repair 50" panasonic "tnpa4782"
i found info for your 50px80a the 2 blink code for your tv is a sos 15v it MAYBE
came from the "d" board ...These 3 conditions can cause the TV to shutdown and the power LED to blink 2 times=Missing P15V
2.
A short of the P15V
3.
Wrong diagnostic by the D board......When troubleshooting a PDP TV that is shutting down and the power LED blinks 2 times:
Find out if 15V is output at pin 1 of connector P7 of the P board.
If no voltage is output, measure resistance between pin 1 of connector P7 and ground (Chassis). If a shorted 15V is detected, find out if it’s coming from the P board or if it’s coming from any of the other boards that the 15V volt is connected to.
If the P board is OK, disconnect the connectors providing the P15V to all these boards while measuring resistance between pin 1 of connector P7 and ground.
The defective board is found when the connector that provides the P15V to that board is removed and the short circuit is no-longer presentComment
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Re: try to repair 50" panasonic "tnpa4782"
what kind of diode is d865 ?? (voltage/amp)part name b0eckp000047Comment
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Re: try to repair 50" panasonic "tnpa4782"
D865 is the diode number the on the board. the other number is the manufacturers part number. If the diode is not fried or broken, remove it and get the number off the part if possable obsrving the polarity markings if drawn on the boards silkscreen.Comment
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Re: try to repair 50" panasonic "tnpa4782"
most likely a 1N4007 general purpose diode if the b0eckp000047 give the correct clue in the last part of the number or its a coinceidenceComment
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Re: try to repair 50" panasonic "tnpa4782"
on th diode is 88 94 .Under there nothing . i read in another post that diode is rohm 400v 1a correct me if im wrongComment
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Re: try to repair 50" panasonic "tnpa4782"
i was thinking to put a 1n4004 ???Comment
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Re: try to repair 50" panasonic "tnpa4782"
ok i order the part ..thankComment
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Re: try to repair 50" panasonic "tnpa4782"
hummm..all the part replace blow ...i miss one or more somewhere lolComment
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Re: try to repair 50" panasonic "tnpa4782"
Unfortunately replacing just the IGBTs rarely works. Finding all the shorted big stuff is easy.
Other items to watch out for are failed 5v regs, inverter ICs, FET drivers, gate resistors, smd transistors, diodes, optocouplers.
Worst thing about a failed repair is potentially more parts damaged now.
It's a tough task.
Another guy has been trying and replaced a lot more than that and his Q661 blew again.
I've done a TNPA5081, that's it. Try a search and have a read. Might giive some insight, cct have some similarities.
A TNPA4829 was just fixed purely on IGBTs and a diode, luck of the draw.Comment
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Re: try to repair 50" panasonic "tnpa4782"
your right both sd/su board read short !!! need 3 new board now!!dohh!Comment
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Re: try to repair 50" panasonic "tnpa4782"
I replaced a lot of things on TNPA4782, not just IGBTs, but obviously missed something and it blew again
I'll open a new thread so hopefully will get some help and fix it this time
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Re: try to repair 50" panasonic "tnpa4782"
Yeah, well that goes without saying. Always check those before installing a Sc replacement, it may have blown regardless but now you don't know.
You can always jumper SC50 on the Sc and power up without the buffers in future. that's how I tested my repaired SCs initially but still buffer board resistance needs checking before final test.
Any info on how you checked the buffers and what was short? I have had the 5V line on the buffers shorted and the 5V reg on the SC had failed also that supplied it. That was on the 2010 series I was working on.
Not overly familiar with this one though, 2009 model.Comment
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Re: try to repair 50" panasonic "tnpa4782"
3 new board on it and voila like a news ....pain to seat the ribbon cable correctly lolComment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.
The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.
I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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