RCA L32WD22 Power Supply Has No Inverter +24 Volts

[Paul678]

At first I thought it was a bad inverter, but the fuses were good
on the Darfon board, and +24Volts was missing.

Here's that portion of the power supply:





I hope you can read it. +5 and +12 Volts from the other parts of the SMPS were fine.

There was no AC voltage on pins 9 and 16 of the T902 transformer,
so I looked back from there, and found R933 (0.1 Ohm) was
open, and switching MOSFET Q902 was totally shorted out.

Most other components checked out ok, including all the caps,
and it looks like the only way to really test the TEA1532CT
is within the control loop, in circuit.

Here's the full service manual if anyone is interested:



Hopefull these two components were it, but if anyone has
any other ideas, feedback is welcome.

Thanks in advance.....

[JimmysTGP]

Re: RCA L32WD22 Power Supply Has No Inverter +24 Volts

If it was me I would replace TEA1532CT, I ran into a problem very simular which replacing the Mosfet didn't fix it. So I've learn from that, to replace the Drive Ic's. Good luck

[Paul678]

Re: RCA L32WD22 Power Supply Has No Inverter +24 Volts

If it was me I would replace TEA1532CT, I ran into a problem very simular which replacing the Mosfet didn't fix it. So I've learn from that, to replace the Drive Ic's. Good luck

Thanks Jimmy, you were right.

The other components needed replacing, but so did the
TEA1532CT. Got it on Ebay for like $5 total.

TV WORKS GREAT NOW!!!! FUCK YEAH!!!

NOW TO MAKE SOME $$$$$$$$$$$$$$$$$!!!!!!!!

HAHAHA!!!

[DJPC80]

Re: RCA L32WD22 Power Supply Has No Inverter +24 Volts

Hello,
I seem to be running into the same trouble with this system given to me from a family member. I ordered a set of caps to replace in the power supply but even testing it still has the voltages to the main board already. The amber light just stays on and the tv does not turn on. I have also downloaded this picture of your situation and I would like to test it also. Newbie myself with a multimeter, how would I test the items you have identified here? I think it is something small myself and would be grateful to receive help and have a wonderful outcome such as you had. Thank you kindly!

DJ

[selldoor]

Re: RCA L32WD22 Power Supply Has No Inverter +24 Volts

If you read this
https://www.badcaps.net/forum/showthread.php?t=10419 start at post19 it tells how to
test resistors and mosfets and many other components.
Most tests are with power OFF.
As stated the TEA1532CT is not easily tested. It may be quite difficult to remove and replace if you have not had much soldering experience

[j0gigs]

Re: RCA L32WD22 Power Supply Has No Inverter +24 Volts

I hope someone can help me with my problem. i have one of these rca tv's and am having trouble. I replaced all caps on the power supply including the 2 100uf 450v ones. 4 of the caps were domed and one of the 450v ones looked like there was crust coming out of one of the legs. the tv will not turn on. when i first plug it in and try to power it, sometimes the screen flashes a message across the middle of the screen in a box, but it happens so fast i cant read it. Other times the screen will light up for a brief moment and i can see what looks like a headphones icon in the top right corner of the screen.

The tv will just sit there and not do anything. then when i power it off, the orange led flashes 4 times. sometimes it flashed 4 and a half times if that makes sence. its not like a full flash.

i tried checking the voltages on the pins of the power supply and am getting all the voltages i should on the plug going to the main board. 5v, 12v and 15v are all good.

I am also not getting the 24 volts on the plug going to the inverter. i am assuming it is supposed to be 24v dc right? I am not sure what to check and how to check that section of the board. can someone please help?

Can someone please show pictures of what they replaced on the 24v side to get their tv working?

Any help is greatly appreciated.