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Re: RCA no power indicator
Q12 on the back side of the board (great photo by the way) is blown apart.
or there is a piece of trash that looks like foil on the otherwise very clean looking board. Top right of photo near the bottom right of the center coil connectors... 2 up from D12
OOPS it is the TOP right of the center coil connectionsLast edited by Doc38343; 08-06-2017, 07:02 PM.Comment
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Re: RCA no power indicator
So to me without the main board connected you have PS-ON to turn on the 12V power supply and probably the switched 5V as well which means it has pull-up resistor for the PS-ON which is pretty rare for re-badged RCA TV.
It still does not make sense to me to have TWO separated power supply with low output Voltage, especially the 5v to run the main board.
Something is not making sense here at all.Last edited by budm; 08-06-2017, 08:05 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: RCA no power indicator
Attached is a close up of the area in question....Attached FilesComment
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Re: RCA no power indicator
Hard to tell from photo could be trick of the lighting... you need to test the transistor... see if it is shorted to ground or shorted thru itself.
Something is cutting you voltage, but if it was a full short to ground it would either smoke and be obvious or just pull the rail to 0V.
I had a board once on a computer that had a low voltage issue and after many hours i found a shorted smd cap that was connecting a resistor to ground on a 3.3v line and the math for a voltage divider made it 1.2v and that would not let a mosfet trip on.
I don't know if that is your trouble just a possibility that is why it is hard to find.
That part looked completely blown in the other photo but not i'm not sure it may be ok just a lighting illusion... back to the testing board!! (sorry)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.
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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. 😅
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!
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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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