electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
Sharp tv 70DS-03SN, hiccuping PSU

 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs
View previous topic :: View next topic  
Author Message
torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Fri Jun 25, 2010 8:57 pm    Post subject: Sharp tv 70DS-03SN, hiccuping PSU Reply with quote

A tv as above has hiccuping power supply. For each pulse, there is a flashover across R820 (1K0 SMD resistor, probably in beam current limiting circuitry). R613 (2K2 1W resistor in S-correction network at horizontal deflection coils) has signs of overheating and has changed value to about 12 kohm. All semiconductors in horizontal output seem to be ok.

Any ideas?
Back to top
View user's profile Send private message
The_AntiRAM
Guest





PostPosted: Fri Jun 25, 2010 10:01 pm    Post subject: Re: Sharp tv 70DS-03SN, hiccuping PSU Reply with quote

torbjorn wrote:
For each pulse, there is a flashover across R820 (1K0 SMD resistor)




Flyback Trafo ----> H.V. DST BAD.

Anyway Crappy Chassis !!!

(when you start to fix a thing another is going bad)
Back to top
torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Jun 28, 2010 8:42 am    Post subject: Reply with quote

Thanks,
just like what i suspected. A good argument not to repair that set!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs All times are GMT
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Електроника София - Service Manuals Free Download - Prikachi - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Search - Jabse.InK  - Pulsator

Connector Pinout Forum - Новини - SnimkiOt.com - безплатен DNS - Whois разузнаване - Poblizo.com : пътешествия