About Henry A. McKelvey Expertise I have worked in the Electronics field for 25 years, and have been a Telecommunications Expert for 20 years. My Expertise has been in: Video, Audio, RF, Television, and Stereo. I have been in the Television repair business for 25 years and have repaired over 20,000 Televisions in that time. I was a manager of an Information Technology Training Team at The Verizon Advanced Services Group Center, and a Distinguished Member of Technical Staff at Verizon Laboratories. I am now working full time in the TV repair industry until I can find another full time job, I know what your question is: "why don't you just work full time in the TV repair industry permanently?" Well the answer to that is simple, due to the complexity and the DIY craze, TV repair work is at best a good way to make extra money, not to rely on it for your livelihood. A sad truth, but a truth nonetheless.
Experience 25 years as an Electronics Repair Technician, 20 years as a Telecommunications Expert, and I love Electronics.
Organizations The Society of Broadcast Engineers (SBE)
The International Society of Certified Electronics Technicians (ISCET)
Publications On-Line: http://www.fixya.com/users/shuttle83 (solutions to repair issues)
US Patent and Trade Office: (Copy and paste the link below)
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=McKelvey&FIELD1=&co1=AND&TERM2=Verizon&FIELD2=&d=PG01
Education/Credentials University of Phoenix (MSCIS working on)
University of Phoenix (BSIT 2006)
World College CIE (BTEE 2006)
Cleveland Institute of Technology (ASEE 2006)
National Education Center (Diploma in Commputer and Network Technology 1989)
TESST Electronics School (Diploma in Electronics Engineering Technology 1985)
AG Bell Vocational High School (Diploma in Electronics Repair (Radio and Television Repair 1983)
Awards and Honors Society of Broadcast Engineers Membership (July 2006)
Special Technology Achievement & Recognition Award (STAR Award) August 2004 (ISO 9000 Certification VTO-SIT)
CWNP Certified Wireless Network Administrator (June 2004)
Special Technology Achievement & Recognition Award (STAR Award) September 2003 (MSN Project)
Special Technology Achievement & Recognition Award (STAR Award) November 2003 (Client CD and Registration Server Issue)
Network Management Certification (ICCP)(2002)
Data Communications Engineer Certification (Global Knowledge)(2002)
TCP/IP Network Analyst Certification (ICCP) (2002)
Winners Circle Award for Development of the DNOC Provisional training Team (2001)
FCC License General Radiotelephone without endorsement (1985)
FCC License General Radiotelephone with shipboard RADAR endorsement (1985)
Certified Electronics Technician Certificate (Electronic Communications)(1989)
Certified Electronics Technician Certificate (Consumer Electronics)(1985)
6 Patent Applications on file (do google search on "Henry A. McKelvey")
Past/Present Clients See http://www.fixya.com/users/shuttle83
http://www.google.com/search?hl=en&rlz=1T4DMUS_enUS243US243&q=%22Henry+A.+McKelvey%22+TV+Repair&aq=f&oq=&aqi=
Question Toshiba 48 inch. Turns on, sound works, screen comes on but is fuzzy/wavy and you can't make out the image well. what could it be? and how much would it cost to fix?
Answer Hello Joshua,
I apologize for taking so long but I was involved in some upgrades to out website (visit it sometime when you have the chance). OK let's get started on your problem, I am going to assume that this is a projection TV we are talking about.
That would mean that this problem could be a convergence issue and that the convergence amplifiers are malfunctioning and have to be replaced. This task should be done by a qualified TV technician to avoid damage to the TV and possible injury to yourself. The following is a procedure that a TV technician would go through to solve this issue.
1# Get the schematic/service manual for this TV #You will need it because it contains the part numbers and component values you will need for replacement#
2# On the schematic/service manual locate the convergence amplifiers #STK392-110, 120, 150# and the biasing resistors #Write the resistor values down from the schematic#
3# Unplug the TV and remove the rear cover to expose the electronic circuitry.
4# Using the schematic/service manual find the physical location of the two convergence amplifiers #Usually attached to a big metal silver in color heat sink# #Basically it will look like two big black six sided flat modules with a lot of pins on the bottom #18-22 to be exact##.
5# After finding the heat sink and amplifiers remove the screws or the tension bar holding the amplifiers in place.
6# Using a soldering iron and a de-soldering device #either a de-soldering pump or de-soldering wick# remove the solder from the pins of the amplifiers and biasing resistors that protrude from the solder side of the circuit board. #Take into mind that you may have to remove the board in order to do this, use the instructions in the schematic/service manual to do this, and make sure you mark everything you remove to make sure you have a guide as to how to put it back#
7) After removing the solder from the pins off the amplifiers and the biasing resistors, remove the resistors making a list of the value, part number, and location on the board #all of this should be in the schematic/service manual). Then remove the two convergence amplifier modules taking care so as not to damage the circuit board. NOTE: The heat sink compound #the white goopy stuff) may have hardened and caused the module to stick to the heat sink, you will have to gently pry the module away from the heat sink, I have used a light application of isopropyl alcohol to dissolve the heat sink paste.
8) Once the modules are loose from the heat sink, you can gradually remove them from the circuit board.
9) Clean the heat sink off by using the alcohol and a heavy paper towel #remove all of the heat sink paste, and yes this is messy) At this point you have removed the two convergence amplifier modules and the biasing resistors and cleaned the heat sink.
Now you will have to use your schematic/service manual to find the part locations, values and numbers you will need to replace the old parts I suggest replacing the biasing resistors first.
1) Sort out the resistors you will need and as stated in the schematic/service manual and replace them according to the schematic/service manual locations and part numbers.
2) Solder the components #resistors) in place making sure not to short out anything in the process.
3) Apply heat sink paste to the metal side of the modules one at a time and the put the modules into the circuit board lining up the screw holes of the modules with the screw holes in the heat sink, use the removed screws or tension bar to hold the modules down once in place in the circuit board and on the heat sink.
4) Solder the pins of both amplifier modules to the circuit board, taking care not to short out anything.
5) Reinstall the board to the TV, reconnect all cables removed #DOUBLE CHECK EVERYTHING) If all went well the convergence amps should be working, and you will need to realign the convergence of your TV, I suggest using the AUTO Convergence feature of your TV #Use the instructions in the schematic/service manual).
All should be good now. Now these instructions are generic in nature but can be use for a number of Models of Projection TVs.
In addition to this also make sure your Yoke transformers on your CRTs are functioning as they should, check the voltages applied to them.
