Before we get too far into the weeds with this TV, Does the TV reboot completely? or does the TV continue to operate WITH SOUND but a black screen?
And please be clear: When your TV stops working properly, is the screen black and completely without backlights? or is the screen black with no image but backlights are actually on? Your original post does not say.
The fact that you posted a screenshot of the self-check screen indicates your problem may not be a backlight. This may be a mainboard problem where TV mainboard works until it craps out.
If TV still...
Unspun01
Badcaps Veteran
Last Activity: 04-22-2025, 07:57 PM
Joined: 06-28-2011
Location: Manitoba
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Last edited by Unspun01; 04-09-2025, 09:15 AM. -
@sli4: Great that replacing the capacitor worked for you also. And thanks for reporting back with your update. Hope this thread helps others. Take care!Leave a comment:
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I do not know if the original poster has solved this problem, but I had an old NES with a power problem years ago. I remember replacing a large capacitor on the mainboard near the AC input. I don't think it was bulged or visibly bad, but was not within spec. It's connected to the bridge rectifier. Test it with a capacitor tester or replace with a new one. Let us know how it goes.Leave a comment:
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@MaxumElite: Can you confirm that you had the exact same problem as original poster? He stated that his power supply had orange LED and would turn off as soon as plugged into xbox console. The failure of your high voltage 500V mosfet is a high-side problem and I would think you didn't get any LEDs on the power supply (orange or white) at all? This issue is independent of the failing low side capacitors. Just looking for more info. Thanks....Leave a comment:
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Nominal voltage of most lithium-ion or li-po batteries is 3.6-3.7V, so you would definitely need a voltage larger than that to charge your batteries. Almost every lithium ion rechargeable device we use, which charges from a regular USB cable uses 5V to charge a 3.6-3.7V battery. I think you are correct that the voltage is too low.
I suspect there is more corrosion that you have not seen or located. Go over all affected areas with good magnifying lens. Use isopropyl alcohol. Use 99%, not 70% grade or 50% grade because those lesser percentage ones have too mush water in them to be useful....Leave a comment:
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I have a Gamecube that doesn't read discs. Are bad caps as highlighted in your photos actually a cause for DVD-ROM drive not reading discs? I've never heard of this.
I was suspecting a bad laser but if bad capacitors can lead to not reading discs in a Gamecube, I'm happy to have learned something new today.Leave a comment:
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Hi. I read this entire thread, and I need to ask - Besides reading the NOR, and flashing contents back to the NOR, is anyone actually writing all ZEROS (00) or all ONES (FF) to the NOR to see if their actual NOR chip is actually good? Many people using this thread seem to be downloading NOR dumps, or reading/patching and writing to their NOR chips without seeing if the actual chip is working properly.
Some of the posts on here even say they read the NOR, and re-programmed the NOR with the same .BIN file and it seemed to work. This tells me the NOR chip might be dodgy, and may lead...Leave a comment:
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Re: Monster Power HTS 5100 MKII Power Center
Check R27 also. Looks like 220 ohm red red brown. Looks stressed.Leave a comment:
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Re: XBOX One Power Brick Repair
@Leeroy89: I think those 2 mosfets are same, and operate in push-pull configuration. If you can read the one at left side, then I think you can find datasheet and replacement for the one on the right. In my power supply, I could not sourse exact replacement, so I replaced both as matched pair with new MOSFETS of equal or better ratings. If I recall, they are low voltage, high amperage MOSFETs and I may have ended up pulling some off an old P4 PC motherboard.
Usually power supply won't do anything if those transistors are shorted, so if...Leave a comment:
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Re: Monster Power HTS 5100 MKII Power Center
Check your soldering on the burnt trace repairs. Some of those re-soldered connections look a little close for me from the photos. Also, check ALL diodes for shorts. Not sure what happened, but any silicon rectifiers may have experienced over-voltage and may be shorted even if they don't look bad. Also, check the heat sink mounted ICs for shorts between pins in any combination. Sometimes if it is a diode, pins 1-3 are same and may measure 0 ohms which is ok. Check pins 1-2 and 2-3. One is a 7805 5V regulator and should not have shorts...Leave a comment:
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Re: Samsung 245BW Not Powering Up
Check the white capacitor next to bridge rectifier with markings 2J 684J 460S (in the photo posted by BudM) - I think this cap fails internally and you may notice a small almost imperceptible bulge on one side if it is failed. 460V. I think I replaced this failed cap on similar designed power supplied from DongYang power supplies.Leave a comment:
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Re: Samsung UN60EH6003F, no picture, no T Con board, boot loop, etc.
I had this TV a few years ago. TV would turn on with backlights, but no video. Wiggling cables, or detaching and reattaching cables didn't cause any flicker of screen (which I was expecting if there is at least some functionality of TCONN).
Replacing the TCONN with an exact same version for my TV solved my problem, but I wanted to know what the issue with my original TCONN was.
My research led me to a bad IC7100 that may be a common problem on these 60" TCONNs. I think it was ISL98602....Leave a comment:
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Re: Samsung UN65NU6900F - Sound and backlight but no picture
I have same TV. UN65NU6900F. Terrible TV. Most likely a bad panel. covering clock lines may or may not work. you will need to remove the metal covers at bottom of screen and inspect the scalar boards at bottom of panel. There are 4 I think. Call them 1,2,3,4 from left to right as viewed from rear.
They are connected to each other with small ribbon flex cables. 1 to 2, and 3 to 4. #2 and 3 connect to to TCONN as you have seen.
On my TV, I would get backlights and no image at all times. some rebooting...Leave a comment:
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Re: LG 50PK950 - Turning off after 15 Minutes
The last photo of the bottom side of the power supply definitely shows bad solder connections on the large transformers T901 and T902. For sure the upper rightmost pin on each transformer needs to be resoldered. Resolder all pins to be sure. USE FLUX. And I'm talking about the large blue/yellow transformers in upper center of power supply board.
You should also inspect and resolder any ICs or mosfets or diodes mounted to the large heat sinks since they might need attention.
For now I would focus on the visibly...Leave a comment:
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Re: PORSCHE 928 Resistor Pack - Need Help
Oh, sorry I didn't mean to confuse you. I didn't mean to imply that any old resistor pack from an 80s or 90s GM car would work in place of your Porsche resistor pack.
I meant that you could get various diameters and coils of nichrome resistive wires from one of those GM parts to repair your Porsche one. I definitely recommend repairing your existing one.
I don't know what the original one looked like but prominent loops are necessary for cooling of the coils as air passes over them. If your fix works, then thats...Leave a comment:
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Re: Bad Panel in Sony Bravia X850G
Do not give up. I have repaired both LG (more common), and Samsung 4K TV with this tape method. On the samsung, I had the hardest time. Lots of trial and error. While covering all the clock lines may have stopped your jittery or double image, one or more of those lines may need to be "uncovered" to restore correct picture.
In my case, TV would be backlights with black screen only, no image. I taped over like 10-15 lines not knowing what they did, or how. Once the picture came back on, I knew I was in luck....Leave a comment:
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Re: Black screen after reattaching COF, purple bars without it.
Hi unimatrix93:
I have performed this exact repair as you when I had a COF ribbon cable become detached from buffer board (also on a philips LCD panel, but due to an accident by a slight tug on the board)
You may have some pins making connection, and some pins not making connection, or accidental solder bridging between adjacent pins.
My advice it to detach the flex cable, and try re-soldering.
USE LOTS OF FLUX, FRESH SOLDER, and VERY FINE SOLDER TIP....Last edited by Unspun01; 04-15-2022, 02:59 PM.Leave a comment:
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Re: LG 50PK950 - Turning off after 15 Minutes
I agree with Diah:
If your large white ceramic resistors on the upper right corner of the power supply are not "open", then your problem is likely cracked or intermittent solder connections on the yellow jacket transformers.
Just repaired a LG 50PK250 that had your same problem - would turn on and work for a bit then turn off, or would click without turning on. The problem was identified under magnifying glass as bad solder connections to the large yellow-jacket transformers.
Re-touch...Leave a comment:
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Re: PORSCHE 928 Resistor Pack - Need Help
Honestly, While the others have provided some good helpful advice, don't waste your time looking for exact nichrome wires or trying to order spools of expensive stuff.
Go to an autowrecker and look for any 1980's or early 1990's GM vehicle. They usually have a nichrome wire resistor pack in the heater core fan box located under the hood on the firewall. only need to remove 2 screws.
These usually never fail and you will likely find a very close match of resistance, coil size, and resistance to make a reasonable...Leave a comment:
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Re: Panasonic P50S30 SC board pins 1-3 Short
Pin 1-3 of what? What connector are you referring to?
This TV has common failure of SC board. I implore you to search this model TC-P50S30 as well as others such as TC-P50ST30 and TC-P50G30 and TC-P50GT30 as these solutions have been posted many times.
I have no doubt your solution will be to test ALL the IGBTs, specifically [Q401, Q402, Q403], [Q421, Q422, Q423], [Q621, Q622, Q623]. Don't worry about the diodes marked with a "D". They are almost never the problem.
I placed each parallel...Leave a comment:
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