Re: Sony Bravia KDL-46EX640 no power
What do you get at D6201? That should be the diode after the standby transformer. Use the TV for ground when measuring.
Monday I should get the part.
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Re: Sony Bravia KDL-46EX640 no power
In your second picture, do you see any burn marks on the mainboard near the connectors
at the top right of the board? Hard to tell in your pictures.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
98% of the zero power issues I have encountered always seem to lead to a bad power supply board. Even after testing components that seemed ok. Just had a toshiba this weekend with the same issue your having. No standby, no front light, wouldn't respond to remote or side buttons. Just dead!! With meter I could tell the ps board was getting power but that's as far as it was going. No output. Ceramic fuse was fine as well. In most cases this will be a bad ps board. You'll just have to decide if you want to hunt down components or just replace the supply board itself. Rare occasions it can be the main board, but from experience, a bad main will still allow a standby light.
Here was the toshiba I was referring to. Replaced ps, and it lives!! Best of luck
https://www.youtube.com/watch?v=Bk9a...ature=youtu.beLast edited by sugar_ray; 05-02-2014, 10:46 PM.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
Its a Fluke 79III True RMS Multimeter. But when I take the DC voltage, I simply plugged in to AC outlet and measure it across the big capacitor which is 393.4Vdc. I did not use any power switch since I can't see any RED LED standby indicator on the front panel.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
If that is the case, then the main board is sending out the PS_ON to turn on the PFC voltage booster. Turn the TV power switch to off, then the voltage on the cap should drop down to around 160~170VDC. Your meter is good, right?Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
@ budm:
Its 393.4 Volts DC.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
OK, measure the DC voltage right at the two legs of the main filter cap (big black cap laying on its side) C6530. You are working on the HOT side of the circuit so do not touch anything with your hands or body, plug the TV into GFI outlet will be a good idea.
http://www.shopjimmy.com/media/catal...4-11-top_1.jpgLeave a comment:
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Re: Sony Bravia KDL-46EX640 no power
I'm in the same situation with a 55EX720. I don't even have standby.
At the moment I'm waiting for a voltage regulator to arrive. On mine(yours may be different) I have 6 pin voltage regulator at the output of the standby transformer, which shows 4.27V input and output, which is not good, because the output should be 3.3V.
I'm hoping, that it didn't mess up the mainboard.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
Here are some pics as requested.
Last edited by bullwinkle; 05-02-2014, 05:50 PM.Leave a comment:
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Re: Sony Bravia KDL-46EX640 no power
Post good clear pictures of the back side so we can see how the boards are connected together will be a good start.Leave a comment:
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Sony Bravia KDL-46EX640 no power
My 2 year old Sony Bravia KDL-46EX640 LED TV does not have any power at all. No RED LED standby indicator in the front panel can be seen. In short, deadset.
My first step is to check the AC power cord and it turns out OK. Now I check fuses at the power supply board. All are OK. What's next?
Any help would be much appreciated. Please help.Last edited by bullwinkle; 05-02-2014, 05:08 PM.
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I have a Sony Bravia KDL-40V2500 that will not power on. The indicator flashes red 3 times.
I do not hear any sound and I cannot see any backlight.
I have tried disconnecting every cable on each board one at a time to see if anything changes.
The only change is when I disconnect AC-DET cable on the Power Supply board or on the other end if I unplug the CN7009 connection on the B-Board and try to power on the TV the indicator will stay on solid green until I power off.
My friend ordered another used power supply board but it is also doing the red indicator flash 3 times... -
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. 😅
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... -
SONY XR-77A80J shuts off as soon as it is powered on. It goes into standby ok when plugged in but when power button is pressed, relay clicks and tv powers off. Power supply board makes a sound that sounds like momentary coil whine when it clicks off. The main board appears to turn on and has working optical.
I pulled the power supply board for visual inspection & there wasn't anything obvious. I am not sure how to go about testing this OLED as it is a bit different than the last one (LG) I tried to repair. The only voltage listed on the PSU is 12v for T-CON. The 12v is not present...
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