Sound but no picture on samsung tv HLT5687SX/XAA

SOURCE: Samsung LCD TV HCP4363WX/XAA Black screen no sound.

check out the link below ... sounds like a similar problem:
http://www.dslreports.com/forum/r20889230-Samsung-LCD-TV-No-Picture-but-has-Sound

SOURCE: samsung tv sound but no picture

Solution #2 posted on Aug 15, 2009
fastrepairs
Rank: Wiz
Rating: 88%, 28 votes
Make sure your tv is on the right input first of all. The newer flat panel lcds combine the componenent video (red , blue, green) with the composite video and audio (yellow, red, white). If your tv is on the component input then you hear audio from the composite input since the audio inputs (red, white) are shared. Look for a source or tv input button on your remote or the tv itself and try pressing this button unti you see a picture with sound.

I just used this information to solve the same problem...I ended up disconnecting the cable box and restarting the box until I got to the info panel for the box...the picture magicly appeared with several options. I picked one and problem solved...love the faq's on the search engine. lh in dak

SOURCE: my samsung tv hlr5067wx/xaa screen turns black,

I suspect the lamp is failing on your TV. The lamp replacement code is listed on the side of the TV on a sticker that is orange and white. It will start with BP96-. The lamp code is crucial on these older Samsung DLP's because they used quite a few different styles. Please take a few moments to rate my answer. Thank you...

SOURCE: I have a Samsung TV # HLP6163WX/XAA. A loud

I also have a Samsung HLP6163W 61in TV,had the same problem had to replace the color wheel. Went on youtube showed us how to do it our self. Saved a lot of money very easy. Good luck!

SOURCE: HPT5054 50 in. HDTV-Ready Plasma Television: Samsung HPT5054X/XAA - No picture, Sound OK, Have ...

It's not the x main. 90% of the time it's a y buffer that goes out. It's usually the top buffer. 3/4 of the time the buffer takes out the y main board too. You cannot just replace the y-main or buffer because it will just burn out the other within seconds. Also about 1/4 of the time it'll take out the top transformer on the power supply too. The solution? First disconnect the power to the y main board. turn on the television and check the voltages coming off of it. Careful it's high voltage 208V! Remember it's DC too. Then disconnect the buffers from the y main board. You can try powering the y-main up to see if the little LED lights up. This does not indicate it's working though but it'll tell you if it is possible to fix. The fixes for these boards is only for electronics guys. It usually involves replacing 1-3 capacitors and 1-4 FET's. Since a bad buffer can take out a good y main in seconds it's usually recommended that one replace all 3 boards at the same time. It's a $250 fix. How do I know all this? I've now repaired 5 of these televisions. I owned one and spent close to 600 repairing it. I bought misc parts and broken sets online for months before I had 2 different repair guys walk me through the process of repairing them. I had so much cash tied up in parts that I bought 3 more dead sets and repaired them to justify all my spending. I've never had an x board fail. I've had EVERY top buffer fail. I've had all but 1 y-mains fail. and 1 lower buffer fail. I've also had the y buffer fry it's top chip, blow a capacitor and FET on the y-main, and fry the top transformer on the power supply before my eyes. It only took 5 seconds. Replacement of the 3 y boards will almost always fix the sound but no picture problem. Hope this helps!