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canadaboy25
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Re: TNPA4250 Board Repair
They are voltages marked on the SC board. If in doubt refer to the service manual.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: TNPA4250 Board Repair
Well I connected the power cable to the SC board and left the data plug disconnected so the tv would stay on.
The VAD tested fine
The VSCN only had 9.3 volts
The VSET tested 321 and is supposed to test 365 +or- 7 volts
I used chassis as ground reference.Last edited by canadaboy25; 07-17-2014, 10:11 PM.canadaboy25
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Re: TNPA4250 Board Repair
Any ideas?canadaboy25
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Re: TNPA4250 Board Repair
If VSCN tests bad with the SU/SD unplugged you probably have a short on the SC board, double check you replaced all shorted FETs.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: TNPA4250 Board Repair
I tried disconnecting the SU and SD boards from The SC board and the VSCN voltage is still only 9 volts.
I tested all of the MOSFET's again and they all tested fine.
All of the tests were done with the data cable unplugged from the SC board so that the TV would stay on.canadaboy25
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Re: TNPA4250 Board Repair
You may require that cable in to get VSCN, it will be briefly available if there is no fault with it so try that.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: TNPA4250 Board Repair
With that cable connected the VSCN voltage jumps to 30 volts and climbs to 35 volts but then the TV shuts off.
The voltage in the manual is much higher than this or does it just need time to climb up?canadaboy25
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Re: TNPA4250 Board Repair
It should be around 140V so that is bad.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: TNPA4250 Board Repair
Well of it's not a a shorted transistor what else could it be?canadaboy25
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Re: TNPA4250 Board Repair
Bad VSCN generator circuit, leaky transistor, bad diode are possibilities.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: TNPA4250 Board Repair
Well I recently picked up an oscilloscope and a desoldering station so those should make troubleshooting go a lot quicker.
I have a lot of time to work on this so if you could tell me anything that I should test I would greatly appreciate the help!canadaboy25
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Re: TNPA4250 Board Repair
What oscilloscope did you get? That would be very helpful.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: TNPA4250 Board Repair
Nice choice! Very powerful scope!
Connect your oscilloscope to the SC output. If you need help locating where, post a clear picture of it.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: TNPA4250 Board Repair
Would you like a picture of the SC board?canadaboy25
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Re: TNPA4250 Board Repair
That would help yes.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: TNPA4250 Board Repair
I apologise in advance for the poor picture quality.
This is such a large board and I don't have a very good camera or lighting.
If you need close-ups of specific areas just let me know.Attached Filescanadaboy25
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Re: TNPA4250 Board Repair
Can you see a point marked TPSC1?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: TNPA4250 Board Repair
I found that test point.
Am I supposed to scope that output with the TV turned on? If so should i have the main power connector and the data connector coming from the main board connected? If i have the data cable connected then the TV shuts off in a matter of seconds. Will that be long enough to perform a measurement?canadaboy25
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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... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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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 There,
This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.
After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.
More Details
TV Model - LG OLED77G1PUA
Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt... -
Hi everyone,
I am trying to fix a samsung washinmachine power supply main board.
I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
The power supply board reference is the following: DC41-00189a
I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel...
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