Re: Sanyo DP42740 Short on Main Board?
Those were the first things I removed but it still drew 2amps it wasn't until I removed the big chip that it stopped. Wouldn't that confirm the regulators are good?
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Re: Sanyo DP42740 Short on Main Board?
I would check the regulators which supply the 1.8 & 1.1V supplyAttached FilesLast edited by dick_barton; 07-12-2016, 08:04 AM.Leave a comment:
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Re: Sanyo DP42740 Short on Main Board?
You have as short cuircuit on your board. Possibly at the point supplying the 1.8V & 1V i.e. a regulator gone short cuircuit and not the large chip.
Do you have the manual?
Edit
Manual http://www.manualslib.com/download/1...o-Dp42740.htmlLast edited by dick_barton; 07-12-2016, 07:55 AM.Leave a comment:
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Re: Sanyo DP42740 Short on Main Board?
Regardless, the IC shouldn't be drawing 2A when it is off. Did the LED light up in front of the TV?
Anyway... got to get going for tonight...Leave a comment:
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Re: Sanyo DP42740 Short on Main Board?
That never got warm initiallyLeave a comment:
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Re: Sanyo DP42740 Short on Main Board?
weird. what about that IC right under the HDMI sockets?Leave a comment:
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Re: Sanyo DP42740 Short on Main Board?
Not sure if it was hit by lightning. Someone in my building asked if I'd look at it.
I ended up soldering it off board using hot air (it was a pain)
Fed power again and there was very minimal amp draw around 100ma. So confirmed it but what's odd is the point I soldered in wires to feed power they still measures shortedLeave a comment:
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Re: Sanyo DP42740 Short on Main Board?
Did it get hit by lightning? You could somehow cut the trace near the IC or take the IC off then feed it power again. Other than that, you would need a very sensitive ohm meter in order to find that short and it is hard to do without proper equipment unless you check every single component on that rail. SMD chip caps fail short for example.Leave a comment:
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Sanyo DP42740 Short on Main Board?
Have this Sanyo plasma Tv that once plugged in, the standby clicks on then quickly powers off.
With main board removed I have steady 5vsb so I start probing around and on two test points for 1.8v and 1v they measure shorty to ground.
I desoldered one cap on the 1.8v line and cap measures fine out of circuit so I soldered in two wires in its place hooked up an external power source and it drew 2amps. Felt around and the only component that got warm was the processor that I'm pointing to in the pic.
Does it mean it's shorted or something else possibly in line causing it to get warm?Attached Files -
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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... -
Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.
Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
Power Board Connector that goes to Main board
CN6401
Pin 01 NC
Pin 02 NC
Pin 03 "BL_ON": 0V
Pin 04 "N/C"
Pin 05 "STBY 3.3V": 3.5V
Pin 06 "GND": N/C
Pin 07 "AC_OFF"... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.
I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match...
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