Sony kdl-46z5100, good sound , no picture via hdmi ports. do get video using home function viewing internet choices and tools. Which board controls hdmi inputs ?

Try changing input to come in through the S-VIDEO or RGB ports to see if it's HD problem or screen itself

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/

In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

It sounds to be a firmware trouble. Will be best to contact the authorized service center for Sony, rather than trying to do it by yourself, as it is a very skilled work, need both concentration and previous experience. google.com/+GopakumarGopalan

Yes ,you should replace the main board ,because you can'nt repair HDMI interface.
Abctay.com Wholesale tv parts,include TV power supply board, logic board, TV LED screen

You need to set your laptop video resolution to the native resolution of the TV, it is too high right now for the TV to display.
http://www.fixya.com/support/r4873371-fixing_out_range_format_not_supported

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Latest firmware fixed it

Check DAV amp menu and select DTS surround or any other digital sound option.

KDL40Z4100 Product Features

• 16:9 Full HD 1080p Resolution (1920x1080p) LCD Panel
• Motionflow 120Hz; improves TV & DVD viewing
• DMeX compatible; allows seamless feature upgrades
• DLNA® Compliant - view photos from another room
• HDMI x4, HD Component x2, PC Input

Technical Details

• Brand Name: Sony
• Model: KDL-40Z4100/B
• Display Technology: TFT active matrix
• Display Size: 40 inches
• Image Aspect Ratio: 16:9
• is_hdtv_compatible: Y
• speakers_included_description: 2 speakers
• Height: 23.9 inches
• Width: 37.2 inches
• Depth: 2.8 inches
• Weight: 39.7 pounds
• Refresh Rate: 120

KDL-40WL140 Product Features

• 16:9 Full HD 1080p Resolution (1920x1080p) LCD Panel
• Motionflow™ 120Hz - clear, smooth motion for DVDs, TV
• DMex ™ compatible; allows seamless feature upgrades
• Enhanced XMB™ with 3D graphics incl. TV Guide
• HDMI™ x4, HD Component x2, PC Input

Technical Details

• Brand Name: Sony
• Model: KDL-40W4100
• Display Technology: TFT active matrix
• Display Size: 40 inches
• Image Aspect Ratio: 16:9
• is_hdtv_compatible: Y
• speakers_included_description: 2 speakers
• Height: 25.4 inches
• Width: 38.8 inches
• Depth: 4.3 inches
• Weight: 44.1 pounds
• Refresh Rate: 120

Bottom line for the extra connectivity and DLNA certification i would go with the
Bravia Z-Series KDL-40Z4100/B 40-Inch 1080pBecause if you connect this to your in home network you can stream music videos and music off you PC onto your TV without the need for extra wired or memory cards etc.

Otherwise if you don't need this feature the other options are identical on the other TV so it is just as good a choice.

These tv's receive digital on the atsc 8vsb. Do you know what there broadcasting in New Zealand ? It could be that a Sony tech there can fix your problem. The TV can be set-up for a different digital broadcast and Sony is all over the world even in New Zealand .

Connect the PS3 to your TV with the hdmi cable and to the surround sound system with a digital optical cable, then set your PS3 to output sound through the optical port (through the sound options menu) and you're good to go!