Question about Mitsubishi CK-31304 TV

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Vertical deflection went out and now HV is going into shutdown

I replaced the vertical deflection chip and it worked for a minute then went out again. I don't have a schematic and I noticed that vertical deflection circuit is designed with exact tolerance, no vertical adjustment.

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Hi,
Get service manual / schematics from HERE and find why vertical uotput IC is blown in your TV.
Service Manual will also give you info how to perform vertical adjustments.
Hope this info will help you to resolve problem.

Posted on Aug 22, 2008

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Posted on Jan 02, 2017

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When I turn the TV it takes some time to turn on. 4, 5 to six hours. What could be the problem.


The hv would come up and then shutdown with 3 pulses. Monitoring EHT line from flyback at pin 10 of connector BL111 from deflection board to small signal board measured only +15 volts before shutdown. This is normally around +26 volts. according to Tech-Line Found resistor RL044 on deflection board off pin 10 same connector had increased in value to 650K ohm should be 221K ohm this resistor is located under heatsink for vertical IC.
if you are not a tech this is not something you should do. this is one thing it could be.

Dec 31, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

3 Answers

Error code 2-3 it turns on and inmediately goes down


As far as I can recall, this set uses a standard vertical IC. Check that first. It should be an LA7837 or somethint similar. Also, check the capacitors in the same circuit as well as the supply voltages to the chip. If that fails to resolve the problem, please update this and we'll move on to other areas.
Dan

Apr 09, 2008 | Mitsubishi VS-50609 50" Rear Projection...

1 Answer

Tv wont turn on


1024x768 Normal 0 Won’t start

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.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab



Jun 26, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Possible short or maybe thermal breaker?


1024x768 Normal 0 Won’t start

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.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab

Jun 22, 2008 | JVC AV-56WP74 56" Rear Projection...

2 Answers

Mitsubishi vs-50609 wont stay powered on


Hello carriegomez,

I gave this advice to someone with this same problem so here it is again:

It sounds like your shutdown circuit is being activated. This is due to excess current being drawn. This usually happens in the High Voltage section of the TV or one of the deflection stages. Due to the nature of this problem I would suggest that you take it to a local TV repair shop or have a TV repair person come out and take a look at the issue. The HV section is dangerous and should be dealt with by a qualified TV repair technician.

Thank you,
I hope this helps

Shuttle83

Jun 05, 2008 | Mitsubishi VS-50609 50" Rear Projection...

1 Answer

Armed with DMM, tools, and solder...


It is unuaual for the horizontal to go out, leaving a vertical line.
The vertical gets it's power from the horizontal circuit, so if the hor. fails you should have nothing on the display. In this case it may be as simple as the hor. connector to the yoke being burned and not making a good connection. In any case I'm sure the circuitry is ok and you should look for cracked solder joints and/or burned connections. The shut down could be due to there being no hor. deflection, causing the HV to go to high, causing the shutdown. You should check/replace any capacitors that are bad, especially those around the HV shutdown circuit.

May 04, 2008 | RCA 27V520T 27" TV

1 Answer

TV shutdown for roughly 10 - 15 minutes after being on for hours


Yes the vertical circuit will shutdown the set if theres a problem with the deflection circuit. This model has a history of leaking CRT coolant on the boards near the vertical IC destroying the solder and actually eating through the circuit board. Check the area near the Vertical output IC for signs of coolant leakage or solder cracks.

Mar 11, 2008 | Mitsubishi VS-50607 50" Rear Projection...

1 Answer

Sylvania tv


I know your problem for sure. If the fine line you are seeing is horizontal, you have a bad capacitor (or cold solder joint) in the "vertical deflection" circuits. Look for four of the largest wires coming from the picture tube and follow them down to the circuit board. These wires do NOT come out of the BACK of the tube, where most of the wires come from, but rather come sort of from the side of the tube. Two of them will go down to the board near the largest component on your board known as the "flyback transformer". Disregard these two and follow the other two. They will go near either two transistors or a vertical deflection chip. The board will normally be labeled "vertical" or vertical deflection near these transistors. There will be two or more capacitors very near these transistors. Look at them on the underside of the board and look for a bad solder joint. Push on the capacitors left and right while observing the underside of the board and you might be able to see the bad joint. If it is a chip instead of transistors, you could still have a bad capacitor or cold solder joint, but in most cases if it's a chip, then the chip is bad. Since, however, you can tap on the tv and make it work temporarily, this tells me that you probably have two vertical deflection transistors with associated capacitors. If the caps are good and no cold joints, then replace the transistors. This part of your tv is what pulls the electron beam up and down vertically and is thus called the vertical deflection circuits. With no vertical deflection, then the beam just moves left and right and never moves up and down. The picture is still there, but it is contained inside the fine line where of course you cannot see it. The parts in this circuit are not expensive at all. Keever

Mar 03, 2008 | Televison & Video

1 Answer

Vertical deflection


The problem may have been caused by the Vertical Filter Capacitors located in the immediate area of the deflection chip. If this is the case, and the chip you replaced was bad, you may infact, have another bad chip. You need to check for a shorted capacitor before rechanging the chip again. Good Luck
Ed
NC Electronic
Mills, Wyoming

Jan 07, 2008 | Toshiba 30HF85 30" TV

1 Answer

JVC AV-48WP30 will not give a picture


Replace the convergence IC`s again using original Sanyo chips (STK 392-110 or STK 392-180). Make sure to use plenty of heat sink compound. Coat the entire back side of the chips. Also look to see if any of the low ohm resistors are burned. A shorted chip will cause the thumping sound and the set will shutdown. I am guessing that you used generic IC`s as a replacement. They are cheap and the leggs fall off when you apply too much heat during soldering. Dont wory about the CRT driver or the deflection board, they are probably fine.

Dec 12, 2007 | JVC AV-48WP30 48" Rear Projection...

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