Riddled TV Repair Forum
Service Menu and Manual Schematics
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Toshiba TN50X81 - works for 10-15min then turns off    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
Author Message

Joined: 11 Feb 2009
Posts: 17
Location: Johnsburg, IL

PostPosted: Thu Feb 12, 2009 11:32 am    Post subject: Toshiba TN50X81 - works for 10-15min then turns off Reply with quote

I repaired a convergence issue on this Toshiba TN50X81 TV (March 2000)by replacing the convergence ICs. Original were STK392-110's - I used uprated STK392-150 parts for the repair (also used Sanyo parts). Convergence can be set find now.

After the repair, the set ran fine for several hours of testing, but I do notice that the Vertical convergence IC runs very hot. I checked and resoldered all connections on the convergence board, still the Vert Conv. IC runs hot. I also checked the low-ohm resistors to the convergence ICs...all of these measured fine and showed no signs of overheating. I did use fresh thermal grease when fastening down the new convergence ICs, too.

I replaced that hot-running convergence IC with another new one...the same thing is happening - it still runs very hot, compared to the other. I don't have a schematic for this TV set, yet, but the PCB is marked V (for vertical?) by the hot-running convergence IC - the H (horizontal?) IC is running much cooler. The TV shut-off again after 15minutes or so. gain, the vertical convergence IC is running very hot - you can only barely touch the heat sink. The horizontal convergence IC's heatsink runs warm, but not uncomfortably so.

Thanks for any help!

PostPost subject: Advertisement

Display posts from previous:   
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair All times are GMT - 6 Hours
Page 1 of 1


Disclaimer: All information provided by RiddledTV is strictly for information purposes only. Please observe all warnings displayed on your electronic
devices. This information should only be used to help diagnose work, and all service should be performed by a qualified technician.
Privacy Policy       Copyright © 2020 RiddledTV.com       Advertise on RiddedTV.com