Picked this TV up, The Tv will not turn on .It has a blue led light on in the right hand corner that comes on when you plug it in. If you hit the power button again the light gets brighter for a second when the tV shuts off. All the voltage is right on the power board 5v and 12v. On the main board the powers are right for 12v and 5v but the 3.3v is not right. It is measuring 5.27v
coby LED 2326 will not turn on
Collapse
X
-
Tags: None
-
Re: coby LED 2326 will not turn on
Where is that 3.3V test point? Is it under that long board attached to the power supply board?
I see the connector on the left side of the board where it has 3.3v label on it, so it must be 3.3V regulator or buck regulator on the main board.Last edited by budm; 03-27-2013, 10:37 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=24809 -
Comment
-
Re: coby LED 2326 will not turn on
Can you trace that back to the connection on the power supply board since I can only the the connector labeled with 5V and 12v OUTPUTS. There must be a regulator some where that drops the 5V down to 3.3V.
I see at least two 3-leg regulators on the main board.Last edited by budm; 03-27-2013, 10:38 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: coby LED 2326 will not turn on
Comment
-
Re: coby LED 2326 will not turn on
Coby!! I thought they made trouser presses!!
U21 is an adjustable VR - can you test it -you have had lots of practice with those.
Also what is the value of the little attached resistors.
EDIT sorry that is CorbyPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: coby LED 2326 will not turn on
Budm did say trace it on the power supply (not sure if that is what he meant) but you have posted pics of the main board.
Can you do a close up of the other VR and on the power supply a pic from the side
showing all the legend for the connector and another shot of the back of the power supply
as the bit needed to trace back from the pin is flashed out.
ALSO what is the black blodge by the other connector on the main board has something died there - can you clean it off with isopropyl alcohol. There is also another streak in the last 3 opics can you clean that off as well in case it has gone conductive.
None conductive stuff and dust heat up and if they get to the point where they oxidize or start to burn it can turn to carbon which is conductive.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: coby LED 2326 will not turn on
selldoor, do I test u21 with power on or off? I will be posting more pictures soon. The brown stuff your seeing on the board i think is glue. I will try and get it offComment
-
Re: coby LED 2326 will not turn on
Power on, I think one of those regulator is for the 3.3V.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: coby LED 2326 will not turn on
Budm did say trace it on the power supply (not sure if that is what he meant) but you have posted pics of the main board.
Can you do a close up of the other VR and on the power supply a pic from the side
showing all the legend for the connector and another shot of the back of the power supply
as the bit needed to trace back from the pin is flashed out.
ALSO what is the black blodge by the other connector on the main board has something died there - can you clean it off with isopropyl alcohol. There is also another streak in the last 3 opics can you clean that off as well in case it has gone conductive.
None conductive stuff and dust heat up and if they get to the point where they oxidize or start to burn it can turn to carbon which is conductive.Comment
-
Re: coby LED 2326 will not turn on
Ok - U20 is the 3.3 volt VR but what part numbers are the two on the back U3 and U4
Also in pic4 just above R29 there is a black spot between two traces - is it just debris?
can you remove it and check the traces are not bridged.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: coby LED 2326 will not turn on
U3 3251 R64 11051
U4 ME 15N10
R29 was nothing just something on the boardComment
-
Re: coby LED 2326 will not turn on
U4 is a mosfet
https://cdn.badcaps-static.com/pdfs/...33c86bdf36.pdf
There is something before 3251 ? on U3 two letters?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: coby LED 2326 will not turn on
U4 is a mosfet
https://cdn.badcaps-static.com/pdfs/...33c86bdf36.pdf
There is something before 3251 ? on U3 two letters?Comment
-
Re: coby LED 2326 will not turn on
U21 Tab-1.2v, pin 1-3.3v, center pin- 3.308v, pin 2- 000.1v
U20 tab -3.206v, pin1-2.02v, center pin-3.201v, pin 2-5.14vComment
-
Re: coby LED 2326 will not turn on
Ok so still 5v on that pin marked 3.3? Can you trace back from that pin to either of these
VRsPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Comment
-
Re: coby LED 2326 will not turn on
All too often I have encountered errors on labels -- engineers in a rush to finish by 5pm?
(That happened today and I realised I forgot something important but luckily I can easily sort it out Tuesday...)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
-
Comment
-
Re: coby LED 2326 will not turn on
Good news is, neither can we. This board will use at least 4 layers meaning two hidden between the top and bottom. More likely it will be 6 layers making it even harder.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
Related Topics
Collapse
-
by brzostosHello, HP laptop model 15-EU0005NA. It does not turn on, 1 in 100 manages to turn it on then after a while it freezes/disappears/flashes, etc.
After removing the motherboard and connecting the board with RAM to the power supply, I noticed that at first all voltages start correctly and after a few seconds 3.3V on the PL4501 coil disappears and somewhere in this area something starts beeping on the board, sometimes after touching it with a finger in the area of PL4551 it stops beeping and 3.3V appears again.
Original HP 150W power supply, the diode in the power socket lights... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?by Tynan DillI 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...7 Photos -
by m1ch43lzmHi, 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... -
by HakuuHi 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... -
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