Element ELCHW402 - Will not turn on!

[newuser65]

Re: Element ELCHW402 - Will not turn on!

It is either you are measuring it wrong by using the wrong GND ref point such as chassis for your meter or the meter is bad.
When you measure DCV in the HOT side of the circuit, you have to use the negative leg of the main filter cap as the GND ref. for the meter.
So check the DCV again BETWEEN THE TWO LEGS of the main filter cap.

I'm a carpenter... I was using the chassis for GND...
Care to tell me which is the main filter capacitor and which is the negative if not marked with a stripe...
Thank you for the help to by the way.

[budm]

Re: Element ELCHW402 - Will not turn on!

That is the one, but something does not look right, the cap is only rated at 250VDC instead of 450VDC for typical PFC Voltage booster circuit.
No one had work on this board before, right?
The stripe marking is the negative.

[newuser65]

Re: Element ELCHW402 - Will not turn on!

That is the one, but something does not look right, the cap is only rated at 250VDC instead of 450VDC for typical PFC Voltage booster circuit.
No one had work on this board before, right?
The stripe marking is the negative.

Not to my knowledge no one has touched it, it still has the factory sticker on it so I'm "assuming" it's original. I'm measuring 221 VDC on each leg of said PFC now with the correct GND.

[budm]

Re: Element ELCHW402 - Will not turn on!

OK, so the PFC Voltage booster circuit is working otherwise you will only have about 160VDC on the cap, which also mean the PS-ON signal is fine.

[newuser65]

Re: Element ELCHW402 - Will not turn on!

OK, so the PFC Voltage booster circuit is working otherwise you will only have about 160VDC on the cap, which also mean the PS-ON signal is fine.

I guess I'm waiting on the replacement cap, the one that don't look good
Again thanks for all the help.

[newuser65]

Re: Element ELCHW402 - Will not turn on!

New cap was in the mail today after work, got it changed out hooked the board back in to the TV. Turned it on and nothing I thought for sure that was the problem. Any idea before I set it up for target practice?

[newuser65]

Re: Element ELCHW402 - Will not turn on!

Before I do this to it I've found a used working board...
http://www.ebay.com/itm/201567032229

[budm]

Re: Element ELCHW402 - Will not turn on!

https://www.badcaps.net/forum/attach...8&d=1461983217

The legs of the caps are actually making good contact to the copper traces? The traces look burnt from soldering.
Otherwise we will need to do more in-depth troubleshooting to find out if that 16-PIN SMD IC is getting the VCC for it to run or not.

[newuser65]

Re: Element ELCHW402 - Will not turn on!

https://www.badcaps.net/forum/attach...8&d=1461983217

The legs of the caps are actually making good contact to the copper traces? The traces look burnt from soldering.
Otherwise we will need to do more in-depth troubleshooting to find out if that 16-PIN SMD IC is getting the VCC for it to run or not.

I'm almost positive they are, I was thinking the same thing and did it a 2nd or third time to make sure. I can't find my small iron so yes I did put a few burnt spots on the board

[RCA2000]

Re: Element ELCHW402 - Will not turn on!

What solved the problem for me was C811 & C812 in the power supply (top left corner), 10uf@25v. This is in the power source for N831.

You may never know just HOW helpful your post has been !! I had a PAIR of these boards.....with this "intermittent no-start problem. these caps...along with C-814, 100/35V.,(filters the "start supply" for N811,) for insurance..FIXED the problem !!