Hello my name is Rod.. i have a 2008 Sanyo Tv AVP4232 , the power board keeps blowing out a 7 pin Transistor . my tv repairman cant find the problem? with three attempts all burn out. Any help would be helpfull...
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Re: Power board not working
Most likely a short beyond overloading the chip, adding the service manual below hopefully it will help you outLiberating magic smoke one part at a time -
Re: Power board not working
Hello, I have a similar Sanyo television but the power supply diagram does not match mine. Mine would be XI6HA01820A4.
Can anyone help me find this schematic?Comment
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Re: Power board not working
well what are your symptoms, maybe we can muddle thru without a schemo.Comment
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Re: Power board not working
A small capacitor is burned. I can't read its value. In the diagram shared here these parts are missing.
When the television is on, I get no values at the x-sus and y-sus outputs. I suspect the IGBT MR4030. On the MR4030 datasheet I found that the capacitor value would be between 820pf and 2200pf.Comment
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Re: Power board not working
test that igbt for shorts, test the rest of them too.Last edited by nomoresonys; 10-28-2022, 01:21 PM.Comment
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Re: Power board not working
these old plasmas are getting more expensive to fix every day as the replacement boards become scarcer.Comment
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Re: Power board not working
the last one I worked on was a real pain in the ass, after fixing all the igbt's on the x board and a diode and replacing numerous caps, I found both y-buffer boards shorted and called it quits, honestly its only 720p, about any led lit tv you get a hold of will give you a better quality picture, its 720 vs 1080 or 4k. I would stay away from the off off brands, from recent reviews the hisesnse, tcl, seem to get pretty good reviews for a budget tv.Last edited by nomoresonys; 10-28-2022, 02:34 PM.Comment
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Re: Power board not working
plasmas may have had a great picture in their day, theres a very good reason they quit making them, just not great engineering imo, they run hot and heat kills, plus they're big time energy hogs.Last edited by nomoresonys; 10-28-2022, 01:46 PM.Comment
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Re: Power board not working
I appreciate and agree with your comment on plasma tvs. Thanks a lot.
She's going to end up in the recovery center.Comment
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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 and thanks in advance for any input you might provide!
I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO
Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this... -
For masochists who want to see some of the crap that I have been through already... (Truly optional now though, all those trees were barked up for no reason.)
https://www.badcaps.net/forum/troubl...klight-circuit
I started a new thread to get a fresher look at things, even with eyes that looked before. It's different now!
So I got this on Facebook for $66US, blank screen. Just reseated all... -
ONN 100012588
Issue: No Power, Then Rebooting After Main Board Change
Short answer: replace main board and power board
Technical answer: replace main board and Q306 & Q307 on power board.
Long answer:
TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge.... -
I picked up this TV from Facebook Marketplace, original owner described it as "screen went black after a pop" and I hoped to see an obvious fuse or cap to replace. Doesn't seem to be the case, but my experience and electrical knowledge are kind of limited for this.
The power board (BN44-00445A, see attached) turns on and Vs and Va seem to momentarily have power, then they steadily drain to zero over a minute or two as if they're only getting power from capacitors. I've been measuring Vs and Va from the test pads, with and without the other boards connected to the power board...
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