58l1350uc no power/lights

[dick_barton]

Re: 58l1350uc no power/lights

Looking at the link you provided in the first post, BudM suggests in that post that if you have PW_On and 5V standby then to check C113. Best if you can remove it and test the capacitance is correct.
He also suggests to start troubleshooting around U1 (SSC9522S) by checking the voltage between Pin 4 (GND) and Pin 14 (VCC) of that IC. Unfortunately without the schematic the problem was never resolved but it would be worth doing the checks just mentioned.

[tmlfan]

Re: 58l1350uc no power/lights

changed out final resistor to what i assume is 274 stamped on it, swapped with a 270k resistor also pulled c113 out and the capacitance is supposed to be 27n and measured at 26, still nothing, might be easier at this point to admint defeat and either chuck it or buy a new power board, but i have looked and parts for this tv are either hard to find or more than i want to spend to fix it

[dick_barton]

Re: 58l1350uc no power/lights

Hold fire if you can. Perhaps Budm will see this post and offer some advice.

[dskall]

Re: 58l1350uc no power/lights

So what is voltage on main cap now?

[tmlfan]

Re: 58l1350uc no power/lights

hasn't changed any, now i've been pulling out caps and testing them from the top of the board and so far they have all been testing out but the 2 main ones are rated at 82u and are measuring at 71u, is there a 20% tolerance on most caps?

[dskall]

Re: 58l1350uc no power/lights

See my disclaimer. Your pfc is low and I think the ic801 is for your standby voltage not your boosted voltage. Pictures and info is scattered between two posts so confusing for me. If you could post some clear pictures of your power board front and back and ic numbers from back of board would help.

[tmlfan]

Re: 58l1350uc no power/lights

How are these ?

[dskall]

Re: 58l1350uc no power/lights

What is number on u3?

[tmlfan]

Re: 58l1350uc no power/lights

1607b
pfxj

[dskall]

Re: 58l1350uc no power/lights

There's a couple resistors on pin 1 of u3 that make a voltage divider to set your pfc voltage you need to check

[tmlfan]

Re: 58l1350uc no power/lights

i have been trying to find a pinout for this chip so i can determine what pin is ground so i can use that to figure out what pin is pin 1 because there's no indent on ic to label pin 1 but the funny thing is when i set my meter to test continuity it beeps if there's a connection and when i ground my black probe on the board the red probe doesn't beep on any of the 8 pins on u3

[dskall]

Re: 58l1350uc no power/lights

On picture of your board looks like there is a 1 lower left and 5 upper right printed on board
https://cdn.badcaps-static.com/pdfs/...1c0971084b.pdf

[tmlfan]

Re: 58l1350uc no power/lights

Checked r20 and r21, both 1M resistors and both measure 0.846M ohms

[dskall]

Re: 58l1350uc no power/lights

I would replace them and check you voltage again on main cap

[tmlfan]

Re: 58l1350uc no power/lights

169V on both caps and 169V dc across power transistor

[Andrew F. Ali]

Re: 58l1350uc no power/lights

When measuring the Vdc on the main caps, are you placing the black lead on the -ve and the red lead on the +ve of the caps??

[dskall]

Re: 58l1350uc no power/lights

That must be in standby because you had 360v before

[tmlfan]

Re: 58l1350uc no power/lights

yeah i dont know what happened, voltage dropped once i put both of those 1M resistors on pin 1 of u3 (R20/R21)

[tmlfan]

Re: 58l1350uc no power/lights

yes to black lead on - and red on +

[Mouse2222]

Re: 58l1350uc no power/lights

I have a 58L1350UC toshiba tv that has no power and I have 0 volts at the 5vpin. Any ideas would be great. I am new to this site