Have TV Questions? Ask a TV Technician
Normally a repair tech will try swapping in replacement boards, and the power supply board is suspect on this set, given your symptoms.
Replacement boards are available from www.shopjimmy.com, www.ebay.com and other sites.
To troubleshoot at component level, you would need to obtain schematics for the set and be familiar with reading them.
Initially, test if the fans are getting any voltage and let me know;
- either they are not getting voltage or they need replacing.