Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Panasonic CT-31S18S no video    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
tvt



Joined: 05 Apr 2010
Posts: 2
Location: Boston

PostPosted: Mon Apr 05, 2010 5:58 am    Post subject: Panasonic CT-31S18S no video Reply with quote

Panasonic
CT-31S18S
AEDP242

At first the verticle collapsed, a horizontal line at the middle after the TV wamr up.
Resoldered the VERT region, checked capacitors, they seem alright.
However, no video now, a colored horizontal line (sometime a half line) only flashes at on/off.

C455, C451 C458, OK, D812, C810 OK.
Sound is still OK.

How do I test IC451 (LA7836)?

One more question, I cannot find schemtics for AEDP242, is it the same as AEDP246?

thanks.

tvt
Google

PostPost subject: Advertisement

JTS1957



Joined: 21 Jan 2009
Posts: 2329
Location: Far, Far Away

PostPosted: Mon Apr 05, 2010 10:37 am    Post subject: Reply with quote

Make sure there's no "crator" in the face of that IC. Recheck your soldering for "bridges." Check B-Plus voltages pins 1 & 7.
What were capacitors "checked" with?
http://pdf1.alldatasheet.com/datasheet-pdf/view/40353/SANYO/LA7836.html
tvt



Joined: 05 Apr 2010
Posts: 2
Location: Boston

PostPosted: Tue Apr 06, 2010 7:29 am    Post subject: Panasonic CT-31S18S no video Reply with quote

I tested capacitors by a Fluke meter with C readings.
Most C measured at about the marked values on the board,
those not, I have taken them out and measured OK.
Checked VCC at pins 1 and 7 OK.
I guess something in the IC451, that turns the thermal protection on
and shut it immediately, but don't know why and how to fix.
Thanks.
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.
Contact Us       Privacy Policy       Copyright © 2015 RiddledTV.com       Advertise on RiddedTV.com