Set shuts off and blinks 7 times. Any thoughts?
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Re: Panasonic TH-42PX77U
could be SC, SU, SD, P board
There is a troubleshooting guide for this series -
Re: Panasonic TH-42PX77U
So I did a little more troubleshooting. I found that the 2.2K ohm (white) resistor on the SC1 board heats up to about 430 deg. when operating. When I remove the top board (SU) the resistor reads 125 deg. Also the 6 chips on the top board heat up but the 6 chips on the lower board (SC) do not heat up. Maybe the SC board is bad? Any thoughts?
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Re: Panasonic TH-42PX77U
7-Blink indicates 'Floating Supply' VSCN or VAD issue--Or being dragged down by fault on SC--maybe around Q660 or a Fault on either Buffer (SU/SD)....
Check VAD and VSCN without Buffers connected--Then again With...
VAD around Minus 185 and VSCN around Plus 160Last edited by Alastair E; 02-17-2016, 12:50 PM.TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
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Re: Panasonic TH-42PX77U
Ok thank you but I'm not sure what VSCN or VAD is. Can you help with where to check these voltages?Comment
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Re: Panasonic TH-42PX77U
Ok thanks I found them VSCN is39.26V and VAD is -105VComment
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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... -
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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My old plasma died when one night recently. When I got to it it was giving a 3.3v sos (3 blinks).
I chased my way through the PSU, and a board, with no results.
Replacing a few bulged caps in the PSU, I eventually got to the SC board that had piles of shorts, a quick cheap replacement from china and the tv powers up again, except
I only have the right half of the picture.
Left half is completely blank.
now the c3 board running this side of the screen has its 3.3 and 5v onto the buffer ic and its got the 60v, so that all seems good.
all the other voltage rails...09-24-2024, 04:39 AM
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