coocaa 50S5G smart tv dropped voltage when connecting power supply to mainboard
good day hoping someone can lend a hand, im repairing smart tv 50 inch, status when turning on back light is dim but you can see the tv logo then slowly fading out to black, i check the supply to tcon, i only read 5+v, must be 12v, i removed lvds cable and check voltage to mainboard turned on its also 5v, then i remove the cable mainboard to power supply, i read 12v in power supply, thinking that the problem is in the mainboard, coz theres 12v in power supply, i also check while turning on checking volts in main board 12v dropping to 5v, im just new repairing in TV, hope someone see my post thanks!
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I 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... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
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.... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
Hi There got one of these projectors with no power after stripping down the power supply the main fuse on the board has blown and the n-channel MOSFET is shorted so need to replace the small 6-pin ic but not sure about the ic number 63 523 also the values of the resisters that are blown r24 r28 r29 r30 and also if there is a compatible to the MOSFET KEF5N65
Thanks for any info
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