Re: Philips 42FD9954/17s dead

I replaced the loc4700 cap as was bad on RYAN74's TV. That one is easy to get at. The schematic shows that cap on the Fan related power page.

Since I am not a super guru and it still works after a 1-2 minute warm up, I decided to close it up and use it before I do damage to it or electrocute myself. Hopefully it will either work like this forever or a cap will show itself and pop.

I wonder if the bleeder resistor is not enough Ohms and that is why the TV takes so long to come on. It does look like something put on afterwards......

Re: Philips 42FD9954/17s dead

I finally pulled out the power supply board to get an even closer look at all the components and found a 'surprise' resistor (white, gray, red, gold - see attachment for picture) on the underside (loc2121 - 100v 2200uF) that does not appear to be in the specifications (pages 38-39). It looks like a post fabrication add-on so either the TV was "repaired" before or modified at the factory to work. What does adding a resistor to the leads of a capacitor do ?

Here is what I think I know... When a circuit is off and the cap is...

Re: Philips 42FD9954/17s dead

Ooops, another newbie mistake. I failed to reconnect 0306 when I put it together. Now the TV is back to the normal bad behavior of taking 10 minutes to turn on. I guess I will go and replace all the capacitors in RYAN74's post #54. It would be great if I could pin down the problem to the specific capacitor(s) though...

Re: New Members - please post your introductions here

Hello fellow electronophiles. I am Rich from NY and was given my parents ancient and heavy Phillips 42" Plasma tv which has the clicking issue. I am new to electronics at the capacitor level, but a computer tech and geek for over 15 years. I remember at my last job as Desktop Technician, we tossed tens if not hundreds of Dell Optiplex GX series machines due to bad caps. If I had only known then, I could have made a fortune. Thanks for inviting me to the forum, and good luck to all of you on your ventures to salvaging technology...

Re: Philips 42FD9954/17s dead

Eek. While testing, I shorted pins 5 & 6 (top right from how I'm looking at it) on the TNY256 (loc7500). Pin 5 read approx 156vdc and still reads that. The TV now does the same standby light, then clicks and gives the green, but then clicks off and blinks red. Any ideas on what I broke ? All the readings still look pretty much the same as the tests from RYAN74 in this thread.

I have read this thread probably 25 times now and I learn something more each time. Thank you all for your efforts and knowledge sharing. I would love to...

Re: Philips 42FD9954/17s dead

Help ! What happened with this thread ? I have exactly the same TV with exactly the same readings. What piece or part should I test next or replace... (newbie).