I got this main board and im wondering how to tell what part is bad? theres no sound from main board but it works good besides no sound, its the connector on bottom closest to heatsink
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Last edited by mattstolte; 08-13-2014, 06:31 PM. -
Re: what component can i fix on main board for sound?
Can you get sound through audio out, and headphones?
Could be the amplifier i.c, or it could be missing it's supply. Is there anything from the speakers, even a faint buzz or hiss? -
Re: what component can i fix on main board for sound?
Sound comes from headphone so would that mean its amplifier ic on main board? What is ic that so i can locate it and change it??Comment
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Re: what component can i fix on main board for sound?
Pics not really clear enough - It could be a TDA chip google "tda audio amp ic" images
might give you an idea what to look for.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: what component can i fix on main board for sound?
It is in the bottom right, the IC in the big heatsink with a small plate with 2 screws. Unscrew and find a schematic for that IC. if Vcc and AMP_ON voltages are there, for sure that IC is shot.Comment
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Re: what component can i fix on main board for sound?
I had a similar issue with a 37" Toshiba and I have just purchased a PC 2.1 Logitech speaker system.
With that, I have even improved the sound quality.
It was $25 from Amazon.
I have sold it that way and the person did not complain at all.Comment
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Re: what component can i fix on main board for sound?
You need to get the p/n of that amplifier IC so we can look up the spec sheet for it.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
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Re: what component can i fix on main board for sound?
top row
TDA7266SA
CZOMH VW
MAR CZ 835Comment
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Re: what component can i fix on main board for sound?
http://www.digikey.co.uk/product-det...1-5-ND/2772195
please check yourself if its the correct part before orderingLast edited by vinceroger69; 08-18-2014, 02:01 PM.Comment
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Re: what component can i fix on main board for sound?
So where can i order that part?Comment
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Re: what component can i fix on main board for sound?
Ebay?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: what component can i fix on main board for sound?
Is the part number just the top row then? Cause i foudn some on ebay but the last 3 digits on bottom was different numbersComment
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Re: what component can i fix on main board for sound?
You should check the voltages on the pins first especially the VCC, the STBY, and the Mute pins. It may be stuck in the mute mode or in standby mode.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
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Re: what component can i fix on main board for sound?
see adit post 12 for link to digikey but do as budm says first the part maynot be faultyLast edited by vinceroger69; 08-18-2014, 02:07 PM.Comment
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Re: what component can i fix on main board for sound?
page 2 of the pdf shows the pin layouts set needs to be on to test.
https://www.badcaps.net/forum/showthread.php?t=39365
why two posts open? have you still got the tv to test this board your asking for this help on?Last edited by vinceroger69; 08-18-2014, 02:36 PM.Comment
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Re: what component can i fix on main board for sound?
yes on this one i do, so when i test this component do i need to test it in tv with it on? Or what and do i just put negative probe on ground and positive on these few pins im testing? Bare with me im learning something new everydayComment
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Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM -
ONN 100012588
Issue: No Power, Then Rebooting After Main Board Change
Short answer: replace main board and power board
Technical answer: replace main board and Q306 & Q307 on power board.
Long answer:
TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge.... -
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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