Sharp LC-C5255U No Blink Codes only Black Screen

[bigdotbob]

I am able to turn this unit on and it stays on. However, I am not getting any Blink Codes (power LED nor OPC) The power LED stays green but I have no picture. Any troubleshooting info would be greatly appreciated. Thanks. Also I have removed the main power board and did a visual inspection. Did not find anything. Also did the channel up vol down trick with same result. No difference doing that or just hitting the power button.

[budm]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

No pictures on the screen but you do have backlights?

[bigdotbob]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

No backlights that I can tell. I did however revisit the trouble codes on the tv. Evidently I never left it powered up long enough to get codes. I now get both the power and OPC leds flashing twice together and then the power LED flashes one additional time and then the cycle repeats.

[vinceroger69]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

Service manual may be close enough for the error codes:
https://docs.google.com/file/d/0B3xF...YkU/edit?pli=1
Pictures of the whole back side of the TV will help.
Lots of boards used in the same model as your and in LC52SB55U.

This was posted by budm in another thread but the same tv as yours.

also found this that may help
https://www.badcaps.net/forum/showth...harp+LC-C5255U

[bigdotbob]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

Here are excerpts from the Sharp Service manual concerning the LED/OPC codes. Also I'll take full pics later tonight of the main board and post tomorrow.

According to the manual (assuming I am reading it right) my codes are:

Power LED flashes 3 times. Communication failure with main CPU. See Codes and Codes3

OPC LED flashes 2 times. DET_D3V3 failure. D3.3V not applied at CPU (pin 36) See Codes 2.

[vinceroger69]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

Maybe budm will have a idea what too check next as he was helping in the thread i posted in post 4.

[bigdotbob]

Re: Sharp LC-C5255U No Blink Codes only Black Screen

Wasn't able to take images. camera was dead. phone camera images were not good enough to see the detail required. have a new battery charged and ready. Also after reading the previous posts from jkmorek about a similar issue I am going to work through those steps and add the results here along with the board images.