What is the dlp lamp number for Samsung HL61A750A1FXZA

Lots of issues with that model. Video and text help, but it is old technology and needs replacing.

https://www.google.com/search?q=DLP+HL61A750A1FXZA.+Why+is+it+turning+on+and+shutting+off

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The lamp cooling fan needs to be replaced.

go into menu reset picture settings to default
red , tint or gamma is off

bad color wheel from your description. Might want tolook into the free repair option.http://www.samsung.com/us/dlptvsettlement/ SAMSUNG Digital World DLP TV Settlement Notice

the fan behind the lamp fails the most. http://ww2.justanswer.com/uploads/TVTech1/2011-03-20_172928_untitled_-_1.jpg

Google the model number with lamp and take your pick

Color Wheel. Look up your Model on this website
Encompass Parts Distribution they will list Part/number and their Prices. I found my lamp on Ebay for $85.00 and Ballast board for $65.00.
Also here on FixYa was a Post with Sevice Manual showing you how to Replace Color Wheel.

The "lamp" in this set, I think, is called the "DLP" in the parts listings. That part is number: 4719-001960 and can be purchased from tritronicsinc.com for $249.75 plus shipping. Use the guest account to access this info.

Hope this helps,
Dan

Sounds like the lamp might be burned out. The Lamp should be replaced every couple years. If they are not replaced they will eventually burn out. Replacement is not that difficult and just requires a screwdriver. The lamp is located at the back of the DLP TV on the left side. The lamp can be purchased online from Samsung for about $130 dollars. You might be able to find a aftermarket one for less. Just use your telivision's model number located on the right side of the TV on sticker to cross reference the bulb that is needed or there might be a sticker on the back at the lamp housing that has the lamp part number. And make sure to spend the extra money and get the Lamp with the housing together. You can buy just the lamp for cheaper but that will require you to remove the old lamp from the housing and they are fragile. Much easier installation with the housing/lamp combo.

It sounds like your lamp is going bad. The lamp part number is listed as "lamp code" on a sticker located on the left side of the set. Use this number to grab a replacement off ebay.