Re: KDS K717 Turns on, flickers, then dies

i will find the 10MP kodak tomorrow and try to get some close-ups of the solder on the back that aren't blurry. Thanks for the advice. I will have to figure out a way to extend the wires or run both the ps and inverter cards sitting on the table with the screen held above them. there's not a lot of room to work with.

Re: KDS K717 Turns on, flickers, then dies

I replaced all nine capacitors on the power supply board with panasonic CF's. the same problem still persists. it will power on initially and run fine for about a minute. then it flickers and the backlight goes out. the power light is still green. if i cycle power or plug/unplug the vga cable from the pc, the backlight comes back on for a couple of seconds before dying again.

any suggestions?

Re: KDS K717 Turns on, flickers, then dies

digikey has fast shipping. i opted for the cheaper first class mail and my new panasonic caps arrived today. i will put them in when i get home from work.

Re: KDS K717 Turns on, flickers, then dies

Here is all the info I was able to read off the caps. Thought i was going to have to desolder a couple at first.

HEC 25v 220 uF ZP 105° CU

HEC 25v 470 uF CU28 105°

HEC 25v 680 uF CU28 105°

Where can i find the ripple for these series so i can make sure Panasonic's FM are high enough?

Re: KDS K717 Turns on, flickers, then dies

I found all the sizes of the caps on this board. They are all HEC brand rated at 105 degrees. I saw this brand on the bad brands list on this forum. I am attaching the picture with colored circles around each. the key is as follows

red: 25v 220 uF
yellow: 25v 470 uF
orange: 25v 680 uF

what is a good ripple current value for these? I looked these specs up on digikey and i'm not sure which ripple current mA to get. Can someone point me in the right direction? (the 680 only has one choice, 1.22A...

Re: KDS K717 Turns on, flickers, then dies



I don't have an ESR meter. I only have a digital multimeter. I think I'll the sizes off of them when i get off work tonight and order a whole new set....

Re: KDS K717 Turns on, flickers, then dies



1) That is entirely possible
2) The color of the screen was normal. There were no hues.
3) I tried reducing the brightness and there was no change. the flicker persisted until the screen went black.
4) I didn't think about heat issues. What are the chances of discharging a capacitor into my finger while feeling around on them after i unplug the monitor?...

I have a KDS k717 LCD. It will turn on and work for about 1 minute. It starts to flicker and then the screen goes black. The power light is still green. I can power off and on and the image will appear again for around 5 seconds before the backlight goes dark again. I disassembled the LCD and looked for any signs of bulging capacitors. I wasn't able to find one. I am attaching pictures of the power supply and inverter boards. I was able to repair my viewsonic thanks to the advice on this forum and was hoping to fix this one as well.

Thank you for any help you can give....