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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
Normally schematic diagrams are not possible to send anywhere by this window, as all of them will be in PDF. If you wish to get some schematic diagrams, check this link. Wish you good luck.http://electronicshelponline.blogspot.com/
Pull up previous posts, either by type in the Brand name to
your set in its search box, or view it in Mosaic / Timeslide / Flipcard option.
Select view option by the drop-down view box, at the top left or
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www.manualslib.com > Brands > Sharp Manuals > TV > 21SFX10L
View and Download Sharp 21SFX10L service manual online. Service Manual. 21SFX10L TV pdf manual download. ... INSTALLATION AND SERVICEINSTRUCTIONS . .... (29 pages). TV Sharp 21B-FX8 Operation Manual. (30 pages).
mostly this problem cause opto coupler is short. change the opto coupler and related parts like transistors,zener diode.and check all diodes&capacitors is power supply. you find any leaky or damaged part change it. thank you