Hi guys i have a vizio vw42l. I initially had a bad voltage regular on the main board. I had messed the tracing up on while removing the regulator. After attempts of trying to fix my mess up i made it worse and removed more tracing. I put the project on hold for a couple months and finally just bought a new main board. After installing new board the tv came on and everything worked great! I buttoned everything up the next day and went to turn it on, now i have nothing! Tore back apart and now i am no longer getting 24v or 12v from the power supply. The led turns orange to white and will will turn back off also. I have 5vdc coming from the supply to the main and i am getting 3.3vdc back to the ps_on. The 12v side of the main has no readings what so ever either. Please help, i am getting very frustrated. Thanks.
Another vw42l problem
Collapse
X
-
Tags: None
-
Re: Another vw42l problem
It could be bad caps on the power board. Have you inspected them closely? Especially the ones under the heat sink.
Try warming the caps up with a hair dryer and then try to power it on. -
Re: Another vw42l problem
None of them physically look bad. No bulging ends or anything. I had checked them all the prior time before i realized it was a voltage regulator. They all charged to their respective values. Where does the 24 volt and 12 volt side originate from? Is their anything that triggers them from the main board other than the ps_on?Comment
-
-
Re: Another vw42l problem
Lets find out first to see if the PFC voltage booster circuit is working or not. Check the DC voltage on the two legs of the large cap (450v) in the primary side of the power supply, it should have 160~170vdc when the TV is not turn on, then it should go up to about 380~390v when the TV is turn on. PS_ON turn on the PFC and the 12/24V section.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
-
-
-
Re: Another vw42l problem
Power Factor Correction.
So the next section we need to work on will be the 12v/24v switching power supply section, it will need in-depth troubleshooting down to component level. What kind of tools do you have? Have you done any surface mounted component repair?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
-
Re: Another vw42l problem
I have done a little. I have fixed 6 TVs so far from the forums. Caps, voltage regulators, power transistor. I have usually been able to find a post simular to the issue at had and diag from there. Not this time. I have a klien digital mm. Can read capacitance. Assortment of solder irons, solder sucker, solder wick, and plenty of room!Comment
-
Re: Another vw42l problem
OK, then for me to help you troubleshoot this power supply board, I will need really good clear pictures of the board. Please take the whole picture of the top side and the bottom side of the board, then take close up 1/4 section of board (top and bottom) so I can easily see the traces and the component designators.
I will then try to trace out the circuits and then provide you the test points and components you will need to check.
Just remember that I do not have the board in front of me to look at, so GOOD CLEAR FOCUS pictures are really important.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
-
Re: Another vw42l problem
Sounds good, give me a few and i will get the wife digital camera and get them posted.Comment
-
Comment
-
-
Re: Another vw42l problem
I do not see the picture of the whole view of the bottom side of the board, the other bottom side pictures are out of focus. May be you need good day light for the light source for better pictures.
What I have to do is to print out all the pictures and then tape them together to make one big board and trace out the connections. So you understand what I need for me to be able to see.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
-
Re: Another vw42l problem
Ok, I see the whole bottom side, but it is not in focus.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
-
Re: Another vw42l problem
ok. i guess that i could try that idea in the am. Dark here in wy. I will get them to you first thing in the am. Thanks alot bud for helping me!Comment
-
-
Comment
-
Re: Another vw42l problem
OK, I just download more pictures that you posted, please give me more times to look through them.
By the way, thanks for much better pictures! Same camera that you used last night?Last edited by budm; 04-21-2013, 10:29 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
-
Re: Another vw42l problem
No, last night was 10mp on smart phone with shaky hands. Today was with 16.2mp digital camera on tripod.Comment
Related Topics
Collapse
-
by cheeky2I 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... -
by Dani_2024Hi 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...5 Photos -
by Asraf AtbHi everyone,
Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.
Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.
I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue....1 Photo -
by JSin21Hoping someone here could possibly help. I have a few questions in regards to compatibility with main boards. But I'll give a quick short run down on what's going on first;
I have Samsung Smart TV UA65MU6100WXXY version DA01
Now years ago it started intermittently playing up after a lighting strike. Lighting hit the block of units i was living in at the time. Ever since that night the TV started having a mind of its own, It would randomly turn itself off or on, and all inputs stopped responding like HDMI, aerial, but USB still worked. Anyway, over the next few months...4 Photos -
by jb_BakHey 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"... - Loading...
- No more items.
Comment