Re: This guy has an RCA 42PA30RQ
I actually have the boards in front of me ripped out of a Wii victim
I actually have the boards in front of me ripped out of a Wii victim
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Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: This guy has an RCA 42PA30RQ
over view shot for all the viewersAttached FilesComment
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Re: This guy has an RCA 42PA30RQ
Update with this plasma. I checked my Y-main and came across 4 out of 8 mosfets and Transistors shorted out. I ordered replacements and soldered them onto the Y main board and I have the same problem. As a plan B, I ordered a Y-main board to swap out. I'm praying this fixes the problem.Comment
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Re: This guy has an RCA 42PA30RQ
Ok. So I replaced the Y-main and the Y buffer board today. With all the connectors in their appropriate places, I was still getting the multiple on and off from the power supply. Basically the problem had not changed. So I started my process of elimination by disconnecting the connectors for each board until I isolated the problem. Before the x-main and Y buffer board swap out, I was not getting any Va/Vs voltage at the PSU pin connectors. So, I disconnected the X-Main board first to see if I would get Va/Vs from the PSU with everything connected minus the X-Main...sure enough I am getting 207 Vs and 54 Va. Also now without the X-main connected, I don't get the multiple on and off from the power supply relays. So I'm going to try my hand at checking the X-main for any shorted components and try to repair the X-main. But as a back up..I ordered a replacement X-main board. Oh I connected my oscilloscope up to the new Y-main board as Tom66 explained and I'm getting Vmax =44.0V....Vmin =-60.0V Vrms=54.5V Vavg =54.4V Vpp= 12-16VComment
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Re: This guy has an RCA 42PA30RQ
Photo of the voltage readings from OscilloscopeAttached FilesComment
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Re: This guy has an RCA 42PA30RQ
Definitely not working. You should be seeing a wave not a static DC voltage. I am aware that these boards will give out a DC voltage just after they are turned off. This may be your problem - a protection circuit tripping. Or the y-main is faulty.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
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Re: This guy has an RCA 42PA30RQ
Now I'm confused...I replaced the y-main and Y-buffer and I'm getting correct vs and va without the relay switching on and offComment
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Re: This guy has an RCA 42PA30RQ
Does that mean I purchased a bad Y-main??Comment
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Re: This guy has an RCA 42PA30RQ
I think it's a protection circuit tripping but how do I find out where or what it is? That's going to be a challengeComment
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Re: This guy has an RCA 42PA30RQ
With X-main removed you should see some brief pulses on the Y-main output -- do you?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
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Re: This guy has an RCA 42PA30RQ
Maybe I'm hooking up the oscilloscope wrong on the cap. I attached the probe to the topmost lead as its installed on the board. Confirm I'm to take the ground clip and attach it to ground on chassis ? Or don't connect to ground?Comment
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Re: This guy has an RCA 42PA30RQ
Scope should be grounded. Can you show me a pic of where you are attaching it to?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
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Re: This guy has an RCA 42PA30RQ
sure can but can i was just probing around the primary side of the PSU and this is what I have on the two diodesAttached FilesComment
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Re: This guy has an RCA 42PA30RQ
also when i plug the tV power in, this is the wave from from the transrfomer on the Y-main before the second power of click happens and then it flat linesAttached FilesComment
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Re: This guy has an RCA 42PA30RQ
Were you on 1X or 10X?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
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Re: This guy has an RCA 42PA30RQ
i was on 10xComment
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Re: This guy has an RCA 42PA30RQ
Were you probing on the primary or secondary?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
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Re: This guy has an RCA 42PA30RQ
That wave from was by me just placing the tip of the probe on top of the transformer on the Y Main, and this how I set up the probe to to ground when checking the capAttached FilesComment
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Re: This guy has an RCA 42PA30RQ
That indicates the transformer's being driven, which more or less means that it's working. Please can you try the measurement for the capacitor on 500ms/div. Set the scope up so trace sweeps left to right (put horizontal position on the lefthand side.) Press STOP, plug TV in, then press RUN immediately after doing this, then once the trace nearly reaches the end, press STOP, and show me what it looks like. Note that the Rigol has a USB port, so you can upload the bitmaps it makes directly instead of taking a picture.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
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Re: This guy has an RCA 42PA30RQ
ok..i'm setting it up..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 all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. π
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started βfading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly βnew' Tcon board this time, and... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
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