Re: Vizio Soundbar VSB200B Overheating
I swapped in a new pair of MOSFETs on one channel, but no joy. When I turned the soundbar on, one set of speakers put out a brief burst of static, followed by silence and then the unit returned to the over-current error code.
I think this is the end of my attempts to revive the soundbar. Thanks to momaka and petehall347 for your suggestions along the way.
Computer_Eng
Member
Last Activity: 09-15-2023, 02:54 PM
Joined: 10-26-2014
Location: Vienna, VA
-
Re: Vizio Soundbar VSB200B Overheating
Still waiting for the MOSFETs to show up. They're overdue, but at least they're in transit now. I ordered them from a supplier in NY which was the only ebay vendor shipping from inside the U.S. The choice was getting them quickly or cheaply (i.e., mailed from China). Could have ordered from Mouser or Digikey, but wanted to save on shipping.
The gate drive circuits for the MOSFETs seem to be from the large Avnera AV8112A chip. If you look below the AV8112A there are four groups of discrete components near C10,...Leave a comment:
-
Re: Vizio Soundbar VSB200B Overheating
I agree. It does seem like the failure is consistent with a component gradual drifting out of spec.
I removed the two dual MOSFETs from one of the channels and it eliminated my flashing error code. Now the unit does not give me any errors, which is an improvement. However, the channel I left intact is not working (no audio output, even with an input signal.) This is not what I would have expected unless there's a problem with the remaining MOSFETs.
For now, my plan is to put a couple of new MOSFETs...Leave a comment:
-
Re: Vizio Soundbar VSB200B Overheating
The trajectory of the failure mode has been as follows. Initially, the unit would occasionally flash an error code and while the error code was flashing, the audio was disabled. After a short time, the error indication would reset on its own and the audio would come back on. I believe the original error code was for an overheat condition, but it's possible it was an overcurrent condition (which could have happened if I miscounted the error LEDs and got off by one as the two error LEDs are adjacent.) I installed a cooling fan on the enclosure...Leave a comment:
-
Re: Vizio Soundbar VSB200B Overheating
Here is an update of the VIZIO soundbar. The error I'm getting now is an "over-current error" (different error than the original "overheating condition") The manual says "Over-current detection is indicated, reduce the volume setting of the Sound Bar and Subwoofer temporarily, and turn the unit off for a short period and back on to reset the circuitry. If this indication continues to occur, then reduce the volume level for the particular source content being played."
I removed all source inputs,...Leave a comment:
-
Re: Vizio Soundbar VSB200B Overheating
Here are photos of the top and bottom of the main board.
You are correct, there is no bluetooth capability.
The power output seems to be from dual FDD8424 Dual N & P Channel MOSFETs on the back side of the board. No external heat sinks, so likely a Class D as you speculated....Leave a comment:
-
Vizio Soundbar VSB200B Overheating
I have a Vizio soundbar Model VSB200B which is overheating. This is evidently a common problem. The symptom is, during normal operation, the sound cuts out and its leds flash an error which indicate the soundbar has detected an overheat condition. After a short while, the unit goes back to normal operation, but having the audio cut in and out makes it unusable. I tried adding a fan to one of the ventilation slots which helped for a while, but now the problem has returned.
I opened the unit up and couldn't see any obvious area on the control board which might be the source of the... -
Re: Panasonic Plasma (TH-50PZ77U), bad panel or bad buffer card?
Good and bad news on troubleshooting my Panasonic Plasma.
Good news is the set is now working. Bad news is that I didn't really do anything to fix it.
This is actually part of the pattern. The set will suddenly stop working then it will spontaneously revive itself. This has happened a couple of times now. These "outages" can last for weeks.
I'm going to try and get measurements on the SOS7 circuitry while things are working so I'll have reference points when it...Leave a comment:
-
Re: Panasonic Plasma (TH-50PZ77U), bad panel or bad buffer card?
I checked the voltages on the set and for the most part, they seemed good. These were the values without the SD card.
Vsus = 183.8 (184 nominal)
Ve = 160.8 (161 nominal)
Vset = 239.8
Vad = -90.2
Vscn = 49.38
Vda = 74.8
I pulled out the SU and installed the SD and checked the voltages again. All of them seemed to be within a few tenths of the prior readings before the set went go into shutdown.
I will attempt to measure the +5V which supplies...Leave a comment:
-
Re: Panasonic Plasma (TH-50PZ77U), bad panel or bad buffer card?
Thanks for responding to my post.
I'll check the voltages requested. I plan to check Vsus, Ve, Vset, Vad, Vscn and Vda. Let me know if there any others that would be useful.
One problem I foresee is checking voltages with the SD (lower buffer) card in place. If I fully connect the SD card, the set will go into shutdown and most or perhaps all of the voltages will go to zero. Typically, the set will shut down before I can obtain meaningful readings. Any suggestions?Leave a comment:
-
Re: Panasonic Plasma (TH-50PZ77U), bad panel or bad buffer card?
I'm stuck on troubleshooting this Panasonic Plasma. I ordered and installed a third lower buffer (SD Card), but no luck. I'm still getting a 7-blink shutdown (SOS7). At this point I'm pretty convinced it's not the lower buffer. The problem was originally intermittent, but now it consistently shuts down within a few seconds of turning it on.
The Y-sustain (SC card) and the upper buffer (SU) appear good as the top half of the picture works perfectly when the lower buffer is not installed. If I remove the...Leave a comment:
-
Panasonic Plasma (TH-50PZ77U), bad panel or bad buffer card?
The set is a Panasonic Plasma (TH-50PZ77U). I was troubleshooting the set in an [URL="https://www.badcaps.net/forum/showthread.php?t=41474"]earlier thread[/URL] when it spontaneously started working. It's failed again and I'm trying to decide if it has a bad panel or a bad lower buffer card (SD card).
If I remove the lower buffer, the set works fine (although with only the top half of the picture). With the lower buffer in place, the set shuts down with an SOS7 code (7 blink code). I checked the lower buffer with an ohmmeter and I can't see any shorts on the board (ground... -
Re: Panasonic TH-50PZ77U 7 blink code (SOS7)
Yes, any one ribbon seemed to be shutting it down, at least that was the way it was working yesterday. This morning, I powered up the set and went to double check this. I connected one ribbon cable after another after another, checking the set after each ribbon cable was in place. After all five cables were in place, the set was still running perfectly and has been working fine for the last several hours.
I guess I'll just enjoy watching the set until it decides to fail again. Last time it worked for a week...Leave a comment:
-
Re: Panasonic TH-50PZ77U 7 blink code (SOS7)
The ribbon cables I'm referring to are the ones connected to the plasma panel. Those cables are permanently connected to the panel so there's no possibility of swapping them out. The only other cable connection is between the SC and the SU card and that cable is attached (soldered) on the SC side....Leave a comment:
-
Panasonic TH-50PZ77U 7 blink code (SOS7)
I'm getting a 7 blink code (SOS7) on my Panasonic TH-50PZ77U 50" Plasma (set is likely similar to the 42" TH-42PZ77U). The SOS7 code generally indicates a problem with the Y sustain circuit (i.e., the SC, SU and/or SD cards).
Here are the current symptoms.
If I run the set with the SC (Y sustain) and the SU (upper buffer) plugged in and the SD (lower buffer) unplugged, the set works with a picture on the top half of the screen.
If I plug in the SU and the SD cards without connecting the ribbon cables from the SD to the plasma panel, again... -
Re: New Members - please post your introductions here
Hi,
Google kept sending me to these forums, so I took the hint and joined. I'm an engineer by training, but my formal training has gone long past it's expiration date and I'm retired from the paid working world.
Hope to keep learning.Leave a comment:
No activity results to display
Leave a comment: