Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television
I already went through the convergence problem with this tv about 6 months ago. now when you turn it on it sounds liie its comin on but seems to blow a thermal breaker and starts power cycling. Is this easy to trouble shoot. Im not afraid to try after doing the convergence board.
The power supply has an automatic shutdown circuit that senses a shorted component and excessive current flow.
If you can access the convergence board and remove the plugs one at a time (red, blue or green) for the convergence output, the TV may start up and show a picture with the unplugged color misaligned.
This confirms a short in the convergence output. The convergence IC failure can show up as coloured outlines or power supply shutdown.
If this does not help, then there is some other short circuit in power or deflection circuits. You need a technician to troubleshoot HV or power problems.
Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines or power shutdown.
This is the most common fault in all makes of rear projection TVs.
Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.
Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.
It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip may fail again.
This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.
Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.
If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.
Posted on Jul 07, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 28, 2015 | Dryers
Apr 27, 2011 | Sony KP-57WS500 57" Rear Projection...
Jan 12, 2011 | Sony KP-51HW40 51" Rear Projection...
Jun 02, 2010 | Televison & Video
Feb 06, 2010 | Toshiba 55HX70 55" Rear Projection...
Jun 03, 2009 | Sony KP-51WS510 51" Rear Projection...
Apr 14, 2009 | Memorex MLT3221 32 in. LCD TV
Sep 25, 2008 | Philips Magnavox 9P6034C 60" Rear...
Feb 13, 2008 | Mitsubishi WS-65711 65" Rear Projection...
Jan 09, 2014 | JVC AV-56WP74 56" Rear Projection...
83 people viewed this question
Usually answered in minutes!