coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

Ic1

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

[budm]

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.

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

On pin 15 numbers are just jumping up down

[hmendez86]

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 ka3525a

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

[CapLeaker]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

So what are these voltages that budm requested?

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

They just jumping numbers they not read accurate.

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

Put black probe ground and red probe on pin 15,12,13 and just jumping numbers

[hmendez86]

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 heating

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

Mean DC out put heat sinks

[hmendez86]

Re: coby TFTV4025 POWER SUPPLY 24V NOT PRESENT

this were it gets warm....

[CapLeaker]

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.