Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television
Turn on power - blue light blinks and you can hear a clicking sound or a popping sound wont turn on
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 will 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 10, 2014 | Pioneer PDP-5020FD 50 in. Plasma HDTV
Dec 04, 2014 | JVC LT-40X667 40 in. LCD Television
Nov 03, 2010 | Sony KDS-60A2000 60" HDTV
Nov 18, 2009 | Sony KP-53S35 53" Rear Projection...
May 21, 2009 | Televison & Video
May 03, 2009 | Samsung SP-R4232 42 in. Plasma HDTV
Dec 19, 2006 | JVC PD-42WX84 42 in. HD-Ready Plasma...
Jan 09, 2014 | JVC AV-56WP74 56" Rear Projection...
254 people viewed this question
Usually answered in minutes!