Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Mitsubishi VS-4503R repair & mystery part    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
Gary_Sanders



Joined: 14 Aug 2011
Posts: 1
Location: Midwest

PostPosted: Sun Aug 14, 2011 1:46 am    Post subject: Mitsubishi VS-4503R repair & mystery part Reply with quote

Hi,
I love challenges, but I need some help...
My tv is a Mitsubishi VS-4503R rear projection crt tv, manufactured in October 1990. Frankly, I'm surprised it has lasted this long without any major repairs given that it had been used for several hours almost every day since new.

This unit was working fine until the picture collapsed horizontally, then the tv shut off immediately after, leaving a burnt smell. I pulled the main pcb to find a blackened 1" (approx.) hole in the pcb, located next to the "side pcc" (pincushion?) transformer, the horizontal linearity coil, and a 7w 560 ohm sand resistor.

I've tested the resistor and it measures around 550 ohms, which seems acceptable. The h-lin coil and the pcc transformer are also intact (other than a small amount of soot) and show no evidence of shorting out. I'm planning to re-construct the circuit path in the damaged area with some copper wire.

I'm going to replace the flyback & h.o.t. since I already have those parts...
I also plan to re-cap the main & signal pcbs. The power supply was re-capped 3 years ago. The convergence chips have been replaced and the convergence board was re-capped about 3 months before this event.


My problem:

The only part missing is one labeled in the service manual as "L5A4". I cannot find this in the parts list, nor on the schematic, the only reference to this part is a page that has a copy of the foil side of the pcb, and this part is located right where the burned hole is. Going by the "L", I'm assuming this is a coil or inductor. L5A4 is wired in parallel with the horizontal linearity coil, going by the foil traces. Again, just to be clear there is nothing left of this part, just the burned hole. I'm wondering if anything was ever there, if so I'd like to know the value of the coil/inductor so I may replace it and attempt the repair.

Any ideas?
Google

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.
Contact Us       Privacy Policy       Copyright © 2015 RiddledTV.com       Advertise on RiddedTV.com