Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Ic1
Ic1
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Attached FilesComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Need to check the DCV VCC PIN 15 and GND, pin 12 and VC pin 13 and GND pin 12 to see if the IC is getting the Voltages to run, see spec sheet.
IC1 is KA3525A.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: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
On pin 15 numbers are just jumping up downComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
I got another chip to install same numbers but the top numbers don't match just the ka3525aComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Attached FilesComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
So what are these voltages that budm requested?Comment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
They just jumping numbers they not read accurate.Comment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Put black probe ground and red probe on pin 15,12,13 and just jumping numbersComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
What I notice is that when I connected the power and lefted for a while we're the heat sink is get warm it is were the rectifier the other heat sinks for the ac out put are cold no signs of over heatingComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Mean DC out put heat sinksComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
this were it gets warm....Attached FilesComment
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Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT
Did you check the 2 small orange capacitors? One is next to the IC, the other one is under the heat sink in the primary that gets warm.Comment
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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... -
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... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
Hello!
i got a damaged Manson NTP-5561 (60V, 1,6A DC output) and and the main issue is that the controler IC for the LCD display has a short. The controler IC PIC18F87K90 is mounted on the back of the back of the LCD. Vss-Vdd = 3 Ohm. The 5V and 3,3V power line was killed as well, but that is not a problem. A new LDO 3,3V and 5V 7805 is already ordered.
Replacing the PIC18F87K90 is necessary but that makes no sense without having the HEX dump of the new controler.
Does anybody have such a power supply and could do a HEX dump of the Flash and EEPROM memory?
...04-12-2025, 10:38 AM
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