Replaced mainboard removed dvd tv turns on then off and loops on and off . I have a green power light and it keeps turning on and off . If i reconnect the dvd cables it stay on but then the buttons on tv dont change to the other inputs like hdmi or the tuner . If i can get the looping to stop then the buttons will work again . but when dvd is connected buttons wont work with stay on . The only way Ive fixed it was to remove the dvd and the buttons work
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Last edited by Packard93; 11-14-2016, 05:46 PM. -
Re: Magnavox 32md301b/f7 mainboard replaced
I used old board to get it to switch to hdmi then i put new board in was able to get buttons to work on tv to switch it to hdmi 1 . Tv works great no solarizing at all all fixed with 7 dollar plus 3 dollars to ship it to me . It did not want to switch with new board unless i used the old board tried it with old one then after I got it to switch to hdmi I just put new one in and starting moving the channel + button to change the screen to hdmi with new one I had to do it fast or it might lock up on .All good new board in .My wife has a new tv to watch in her room So I upgraded the tv from tube to this lcd 32 inch for her .We can use the hdmi port now and I can just buy a hdmi switch box if I wanted to add more inputs if I dont like messing with the toggling to other ports on tv. Im guessing this tv some sort of firmware issues with the dvd but she just watches cable shows.
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No standby red light, nothing
This Sony has a separate AC->DC power adapter supplying 19.5V to the TV power board (JK3)
Disconnected JK3 power board from main board, checked voltages on all the pin outs
At a few pins I can see the power supply providing 19.5V to the main board
Based on the service manual triage.. it seems to be pointing towards the power board (JK3) being the most possible culprit
LED light turns on when I disconnect LED driver board ribbon from mainboard (so i thought it is the mainboard,... -
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... -
Hi All,
Need help.
I have a samsung un60j620dafxza led tv. When I plug it in it has no display, no sounds, and no standby lights.
So I opened the tv and disconnected the power to the mainboard and the backlight powered up. This according to many people says that this is a mainboard
problem. I checked the voltage coming from the stb and I read 1.3 volts on pins 1,3,5 and 7 which are low volts instead of 13 volts which i think the lcd panel
might be drawing too much power from the power supply that it prevents the right voltage going to the mainboard.... -
Hi everyone,
I'm trying to repair my LG 49UB850V TV (WebOS 1.0, UHD model from 2014).
Mainboard model: EAX65684604
PCB marking: EBT62954607
SPI chip: Winbond W25X20CLNIG Problem description:
Originally, the TV would turn on (backlight and LED OK if I force them on), but it shut down as soon as any input was received from the IR sensor or remote. The backlight and power board were working fine.
After testing and verifying the voltages (DRY ON, PWR ON, 12V/24V rails), I suspected a corrupted SPI firmware. What I tried so far:- I bought another
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I'm troubleshooting a Philips MDP 3380/12 Blu-ray player that shows no signs of life. The display remains off, and no buttons respond.
Inside, the power supply is working correctly, and all expected voltages on the mainboard match the service manual specifications. The CPU warms up slightly (checked with a thermal camera), the crystal oscillator is functioning, but the reset signal remains high at all times.
The reset circuit appears to consist of two NPN transistors, one driven by 5V VCC and the other by 3.3V STBY, as shown in the attached schematic. Should the reset...
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