sharp 27fs50 has sound but no pic anymore

[Guest]

Sharp model 27f-s50 has sound but no picture..turn the screen pot up at the screen and focus section at rear of set and just get a horizontal white line in middle screen turn it up to much and the white line flickers kinda stobe lightish...tube heaters are lit to a degree im not sure exactly how much glow is supposed to be there..the sound is real good...still changes channels and all that stuff but no channel verification on screen...did notice the top of the screen kinda rolling over about a couple inches worth for a couple weeks before it just turn on with no pic ...any help will be appreciated..and thanks in advance for any replies

[walter58]

Hello,
If you see a bright horizontal line , horizontal deflection is still working, if heaters glow, that's all right too.
Probably there is still hight tension, so I think that the vertical deflection output is defective. The output device is an Integrated circuit,which is mounted on a cooling device. (f.e TDA 3654, multipin ic).
Replace this IC and also replace the electrolytic capacitors in the neighbourhood of the vertical IC.
success!
_________________
never give up when you are looking for something,unless you're forced to !

[gunny]

thanks for the reply ill pop the back off of it again and give it look ..i did see a heatsinked to-220 looking ic on the main board there was nothing heatsinked on the smaller board at the tube....let me pop it apart again and ill get back to ya...

[walter58]

The vertical IC is never mounted on the crt board.
In modern TV's, it could be a TO220 device (TDA9302 f.e.), in older devices it could be a larger device (12 pins in line).
So, keep looking on the main board, write down the IC number and look on the internet to spot the right IC in your television!
doing a great job!

Walter
_________________
never give up when you are looking for something,unless you're forced to !

[gunny]

i found it on the main board ...its a sharp x1224ce 7 pin sip ic..did a little search for the part but didnt come up with much, might have to do some serious internet searching.. i hit a few of my normal electronics spots like mouser , jameco and newark and few others didnt seem they had it either

[velvetlaura]

i've tried to search for this part and they all say it is unavailable. my question is can i use another rear cabinet from any other 27 inch set. help please. i'd hate to trash a set that works.

laura