I have a Vizio plasma with a burnt buffer chip on the upper board. I removed the bad chip and placed the board back into the unit. Next, I turned the set on with no problems but missing lines due to chip not being in place. My question, is the Ymain okay or do I need to look for a cause as to why the buffer chip burned? I just don't want to plug in a good upper buffer board and have it go up in smoke.
-
-
Re: Vizio p50hdtv20a burnt buffer
It sounds to me like just a bad buffer chip only. I'd probably not turn it on again until that board is replaced, since you risk damaging the lower board and the Y-Sus (unless you disconnect the boards first). You may want to do a once-over on the Y-Sus (check caps, sample mosfet tests, etc) and confirm your PSU Vs and VA output voltages, just in case.Last edited by capkid; 04-22-2013, 09:17 PM. -
Re: Vizio p50hdtv20a burnt buffer
I removed the Y Sus board and checked Vs and Va with power turned on.
Va is supposed to be 63v. I tested it at 63v.
Vs is supposed to be 207v. I tested it at 210v. A little high but ok.
No shorted mosfets were found on the Y Sus board. The only fuse on the Y Sus board was not blown. Lastly, I tested with an ESR meter all caps, they were ok. I did find one cap with a bulge and was leaking out the top. It tested ok with the ESR meter, but I'll replace it to be on the safe side.
At this point, I think it might be okay to try another upper buffer board without the risk of blowing it.
Thanks for the help and I will post the results of my findings.Comment
-
Re: Vizio p50hdtv20a burnt buffer
After replacing the burnt buffer and a single capacitor, I am happy to report that the tv is working.
Comment
-
Comment
-
Re: Vizio p50hdtv20a burnt buffer
Good jobComment
-
Re: Vizio p50hdtv20a burnt buffer
Thanks for repair feedback.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
-
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... -
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
-
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Failure Symptom
No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.
Where is the short?
Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.
Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but... -
Hi There,
This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.
After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.
More Details
TV Model - LG OLED77G1PUA
Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
Comment