got a call from friend! tv is shutting off, turning on, volume an such by it self iratticle(sp)! an suggesting on cause! where to focus on mainboard?! will post pics once i go an have a look.
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Re: hisense ltdn42v68us
First, Check for stuck buttons on the remote and on the set itself. -
Re: hisense ltdn42v68us
I believe the word you were trying to spell is eratic.
If the button board is bad, you could test this by unplugging the wires to the button board (the board with the power / volume / channel buttons on the side of tv). Then use the remote to start tv and test it.
If that does nothing id check the voltages leaving the power supply, and then if those are fine consider the mainboard as the likely source of the problems.Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.Comment
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Re: hisense ltdn42v68us
had him pull batteries on remote! an it has a touch button system! hope it just a bad sensors on button system, i have a replacement . thanx, for you time! will let ya know how it goes!Comment
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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: hisense ltdn42v68us
i have now adopted 3 of these sets! 2 do the same, 3rd has dead bulbs took board form it to get one working! worked for five days then started given black screen with an with out sound at times, the channels started cycling, powers on when it wnats to in middle of night! damn thing is haunted, will post pics of sets soon, need some pointers what to test an son on! going to do the hot air test on a set an see if i can get it to fail~!
on a side note but same! lol,. have chance to get an old military oscilloscope for 200cad comes with variable psu. an old analog, should be fun an educational to say the least! my life is analog, lol my digi multi fried out an now back on the old one! like it better! faster response times anyways!Comment
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Re: hisense ltdn42v68us
was switch board in one of the tv's. disconected board an tv has not messed yet! one down 2 too go!Comment
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Re: hisense ltdn42v68us
k finally got to the one with no vid then vid issue! had no vid when i fired it up. put hair dryer on top section of mainboard caps an it came to life for a minute.. held it there a bit more isolating what caps i was hitting an it still liven, waiten for it to dye so i can replace the caps . now on to the one that wont turn on! will post pics when i can get data off of sd card! slot on my laptop is fubared! an dont have usb cable for it! damn i love this site! been reading lots an lots! thanx for being here!!!Comment
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Re: hisense ltdn42v68us
wondering what cap would stop it from powering up! will get voltages soon, have to get new multimeter, also saven for esr meter!Attached FilesComment
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Re: hisense ltdn42v68us
recapped board a while back! all was well, an tonight i noticed my left speaker is not worken! an head phone jack is just crap sound! any ideas where to start to look? psu voltages all good! so i know it on main board! will take pic in morning with cage off of main board!
the Speaker out put is the white 4 prong top right corner right above 2 blue caps that are side by side!Comment
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Re: hisense ltdn42v68us
why does everything end like this! it's a little odd!
I would check if you have good 12V or 18V (or whatever it uses) for audio, could be a bad cap.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: hisense ltdn42v68us
Does it have audio line output? See if you are getting the sound OK from the audio line out. This thing uses Class D amplifrer, the little chip with 4 round inductors and filter caps, check out those filter caps, they are for filtering out the Class D switching modulator.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: hisense ltdn42v68us
thanks will check voltages to sound on main! an Budm sadly it only has a headphone jack out, no audio out witch sucks! lol an its sound out the jack is low an garbled when hooked to stereo!Comment
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Re: hisense ltdn42v68us
sorry budm have not had time to test tv yet! i run audio through stereo so it a back burner unit !Comment
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On this Vizio D65x, the volume will change on its own. I don't mean like during commercials where the volume will increase. I mean its like the (+) volume button on the remote is pressed and the actual volume dialog is displayed on the screen going up. It will do this, then the volume may start going down. It might go all the way to "0"or it might stop at a different number, then start going back up. The whole time its doing this, the volume dialog is shown on the screen.
It wont do it until it has been "ON" for 20 or 30 minutes, so it does seem to be heat related.... -
Hi everyone,
I've got a little "problem child": my Dell Latitude 7420 2-in-1, which had a faulty mainboard.
I replaced it, but ever since, the touchscreen no longer works — and honestly, I’m running out of ideas…
In Windows Device Manager, I just see an I2C HID Device with error code 10. Sporadically, the touchscreen is recognized correctly for just a few seconds, but I haven’t been able to determine under which circumstances this happens.
The touchscreen also doesn’t work in UEFI/BIOS, although it’s enabled... -
Hello,
I have an old MASTER TL-240 LED TV. Since it stopped working and it had a DVB-T receiver that is being dismissed in Italy, I've decided to replace the mainboard with a DVB-T2 one.
The original problem was that when switching on the TV, the power LED was transitioning from red to steady blue, without showing video or audio.
After checking some voltages on the power supply board (HKL-240101-B Rev. 1.4, HKL from now on) someone suggested me to replace the mainboard.
Now I have some doubts about how to connect the new mainboard to the old power supply.
First of... -
I have a strange fault on a Sony amplifier. The volume control varies the display from MIN, then 1 up to 30 and then MAX as expected. At MIN there is no sound. However, at 1 it is quite loud and increasing above 1 does not change the sound level.
I have tried a Cold Reset as per the service manual.
I have looked at the I2C clock and data to volume control chip IC501 (BD3499FV). Data is only sent to IC501 when the volume is set to MIN or 1. At any other setting no data is sent to IC501.
I have looked all the way through the service manual and tried many online... -
Hi,
I bought a used Marantz SR5007 and it's giving me some issues that I can't seem to really place. It functions well in most settings, ARC mostly works, it has no issues driving my speakers in any of the digital input modes, but I'm having issues running analog inputs in direct or pure direct mode. For some reason in this mode there's distortion for every volume increment I give it, but once the volume is stable it has no issues. Muting creates a loud pop, switching to another source also causes a pop and so does turning off the amp in that mode. Again, no issue in the digital modes....
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