View previous topic :: View next topic |
Author |
Message |
barney Guest
|
Posted: Thu May 08, 2008 4:20 pm Post subject: Citizen C27401 TV blown fuse |
|
|
3 years old TV, 3.15A fuse keep blowing.
I took out the HOT, #C4460 (NTE2594), tested leaky. No short circuit without the HOT.
I'll try to find the hot today and change it.
Anything else to check ?
BTW great forum !
Thank you. |
|
Back to top |
|
|
torbjorn
Joined: 07 Jun 2007 Posts: 370 Location: Sweden
|
Posted: Fri May 09, 2008 9:33 am Post subject: |
|
|
If the HOT is defective or suspect, always check out why it has failed.
For example: flyback capacitor, all components in series with the horizontal deflection coils, bad solder joints in the horizontal output area, bad connections to the deflection coils, problems with horizontal drive (either too weak drive pulse so that the HOT doesn't get completely saturated, or horizontal frequency way off from the correct value).
However, it sounds strange that a fuse should blow due to a defective HOT. In conventionally designed TVs, the power supply should begin current limiting, tripping, in such cases. If there is a simple, non-isolated power supply (series regulator or buck converter), make sure that it operates correctly. If the switching/regulator transistor of a such power supply gets shorted, the output voltage will be way too high and cause lots of damage in the set. |
|
Back to top |
|
|
Guest
|
Posted: Fri May 09, 2008 8:52 pm Post subject: Re: Citizen C27401 TV blown fuse |
|
|
barney wrote: | 3 years old TV, 3.15A fuse keep blowing.
I took out the HOT, #C4460 (NTE2594), tested leaky. No short circuit without the HOT.
I'll try to find the hot today and change it.
Anything else to check ?
BTW great forum !
Thank you. |
Check also the rectifier circuit. |
|
Back to top |
|
|
|
|
|
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
|
eServiceInfo on FB -
Service Manuals Free Download -
Service Diagrams
Free TV Schematics Download -
HARDW.net -
Pinout Master -
Jabse Service Manual Search -
Jabse.InK -
onTap.bg
SnimkiOt.com -
Poblizo.com : пътешествия
Latest Service Manuals :
Lexmark E230 Lexmark • bfr30lt1 bfr31lt1 ON Semiconductor • CAR0112 Sony • LW22A13W Samsung • 55PUF6055 Philips • Disassembly & Reassembly Samsung • Epson Stylus Pro Service Manual epson • M120 Gradiente • Gold Coins 1974 xerox • hfe denon pma-715r 915r rg service en DE •
|