My xp308i power supply indicator keeps flasing on and off and all the lights run up and down

Here are links to the service and users manual...Good luck!
Samson XP308I Service Manual Samson XP308i Owner Manual

Read the manual. SamsonTech

if your tv has no power light indicator at the front panel, it was an indication of power supply failure. if just a blinking light indicator that was mean an error detected by the main board.

red light blinking genreally indicates a problem with the bulb or the fan

Bad Power Supply. Weak voltage power rail.

Bestec is a low quality power supply. Used to save the computer manufacturer money.

Also, a Power Supply with a weak voltage power rail will put out enough power to light LED lights, and perhaps spin fans, but not enough power to turn the Processor on, and/or keep it on.

A) ALL the LED lights use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts

C) A typical Processor uses 51 to 125 Watts. Depends on what Processor it is.

Replace the Power Supply. Clean the inside of the computer out, with a can of compressed air for computers before installing.

What is the computer manufacturer name, and Model Number. The Model Number is on the back of a desktop computer tower next to the Windows product key, or up on the side of the computer tower.
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Regards,
joecoolvette

The power supply board may have been damaged. Try leaving the TV unplugged overnight so the Tv can discharge and reset itself. If this doesn't work, the power supply board may need to be looked into by a TV repair shop.
If you have some electronic experience and wish to try to fix it yourself, you can most times find a Service Manual for your TV over the internet for less than $20. It will have schematics, diagrams and parts list for your TV.

Yes. Here are some things that could be an issue:

a problem with power supplies, fans, system temperature, or SCSI hard drives.

Install the Dell Open Manager software to run diagnostic. It will tell you what needs to be fixed.

Difficult to say how much but sounds like fuel issue, most likely o2 sensor fault or catalyst both relatively expensive but the catalst more so, o2 sensors fairly common on these and would guess approx £180 .whch i guess equates to around. $320 ?? supplied and fitted.

Replace the lamp. In rare cases, the lamp power supply or lamp ballast may also need replacing. But, replace the lamp first, and use an original Sony lamp not a cheap aftermarket replacement. If this helps, please be sure to rate the fix! Thanks!

Most likely...Just remove cover on left side and take a look at the lamp and go from there. I may have one in stock if you need it. You will also need a philips screwdriver.. Happy repairing. Guru Jay