Samsung PN50C550G1F Diagnosis

[Austin420]

Hello friends, need assistance diagnosing a TV of mine.

It's a Samsung PN50C550G1F. Turned it on and the input label box (top left of the TV) and a "weak/no signal" box in the middle of the screen turned an extreme yellow tint. Only these boxes on the TV. Turned it off immediately. Smelled burnt plastic/ blown capacitor. Pulled the back off and no obviously blown capacitors.

Turned the TV back on, and the sound and menu images work fine. As does the scramble screen on the coax input. I can't get any sound or video through the any inputs. Tried input sources on different TV and they work fine. It just displays "Weak or no signal. Check Source."

Pulled output ribbon from A/V board and the start-up sounds nor backlight/ menus come on.

Any help on would be greatly appreciated.

Thanks,
Austin

[Austin420]

Re: Samsung PN50C550G1F Diagnosis

Just tried to connect cable via coax. Coax does come through with sound & video. To clarify, HDMI does work on another TV, but no HDMIs appear to be working on this TV.

Edit:
Reading about how sensitive HDMI connectors can be to power surges. Power surge may have happened today...

[tom66]

Re: Samsung PN50C550G1F Diagnosis

Other A/V inputs not working?

With TV in standby, press MUTE - 1 - 8 - 2 - POWER in succession on TV remote. Service menu should be displayed. Select reset option and execute with ENTER. TV will go back completely to factory settings, including hour counter and any custom calibration. Go through plug and play set up and see if fault persists.

[Austin420]

Re: Samsung PN50C550G1F Diagnosis

Thanks Tom,

Other A/V inputs are working. Problem seems to be isolated to HDMI ports only. Factory reset did not work. TV is playing the cable through coax fine right now. I may just go ahead and order a new A/V main board for it. I priced them out somewhere around $50. Seems like it would be a safe bet. Let me know what you think.

[tom66]

Re: Samsung PN50C550G1F Diagnosis

That would be my suggestion. Bad main board.

[freakaftr8]

Re: Samsung PN50C550G1F Diagnosis

Agreed. Your HDMI codec processor went belly up. If you had some soldering skills you can usually replace the IC. Its similar in fashion to replacing a buffer IC.

[tom66]

Re: Samsung PN50C550G1F Diagnosis

On these modern TVs usually HDMI is in one chip (along with everything else!) which will be custom Samsung part.