Cost to fix HDMI on RS400? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 10-10-2019, 09:02 PM - Thread Starter
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Cost to fix HDMI on RS400?

My JVC RS400 just over 2 years old seems seems to have developed an issue - the picture doesn't show (just some strips of color on the top of the screen. First one HDMI port so I used the other, now the 2nd port does the same. Happened when I switched my Roku Ultra to 4K HDR 60Hz. I tried different inputs , different cables and without anything between the proj and inputs and the same thing. only the "Denon" sign when I connect to my AVR shows OK.

Does anyone have a rough estimate of what I can expect to repair (just out of warranty) - to know if it's worth to repair or resell as-is.
Truly a shame as the PQ is utterly stunning. I really loved it and just bought a Panny 824 to really see what it's capable of - wow! Really pissed, especially right outside the warranty period - I asked JVC if they'd make an exception and they said no.
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post #2 of 9 Old 10-10-2019, 09:31 PM
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Your projector has a malfunctioning processor board. The new board costs $ 1,100-1,200. Separately paid for the services of a service center. The price can be from 300 to 1000 $.
You can also contact independent repair specialists. The cost of such repairs is from 200 to 500 $. The price depends on the complexity of the repair (parts, software, etc.).
Also, you can contact me in a private message.
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post #3 of 9 Old 10-10-2019, 10:30 PM
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I answered you in the PM. Gave a link and cost.
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post #4 of 9 Old 10-10-2019, 10:46 PM
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Here in Australia consumer law states that items have a certain life expectancy and if they fail before that (even if outside the warranty) then the manufacturer is still liable.


For example in this instance an expensive projector would expect to have a life of 5yrs + so total failure of the main processor would be considered a total failure of the product and the manufacturer would be expected to repair it free of charge.


You guys have similar "Lemon" laws for cars don't you - does that extend to other items ?



I would contact JVC and ask them to sort it out since it is only just outside warranty and is a complete failure and maybe let them know of the Aussie laws ??





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post #5 of 9 Old 10-10-2019, 10:56 PM
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Quote:
Originally Posted by niterida View Post
Here in Australia consumer law states that items have a certain life expectancy and if they fail before that (even if outside the warranty) then the manufacturer is still liable.


For example in this instance an expensive projector would expect to have a life of 5yrs + so total failure of the main processor would be considered a total failure of the product and the manufacturer would be expected to repair it free of charge.


You guys have similar "Lemon" laws for cars don't you - does that extend to other items ?



I would contact JVC and ask them to sort it out since it is only just outside warranty and is a complete failure and maybe let them know of the Aussie laws ??




In this case, we are not talking about the failure of the main processor. This case is a problem with HDMI, and this is already a possible fault of the consumer. It is known that the HDMI ports during connections must be safe, disconnected from electricity, including static. If the consumer did not comply with this rule, then the guarantee may not apply specifically to this case.
Perhaps for this reason there was a refusal of warranty repairs.
But, you still need to contact the main office. It may be of help with warranty repairs.
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post #6 of 9 Old 10-14-2019, 02:28 AM
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HDMI going bad from jolt of static electricity or live connection is 1 in a thousand at best, probably 1 in 100,000.
That is a cop out if a MFR uses that reason.

The usual reason for HDMI failures is heat from faulty cooling or bad voltage ran through the port at some point from an internal component (resistor/capacitor/diode going out of spec or failing), and it's usually the HDMI chip near the port, not the entire board, but you might not be able to get that part. Now this is across MOST other devices (receivers, etc...), cannot say that applies to this model and projector, but it usually applies to most devices. It's usually the memory registers in the chip that get damaged, but sometimes it's not even that, it's just a bad resistor or something similar, depends. It can be 3-4 different things, but I'm sure with projectors 1 of the 4 is most common (I don't know which one).

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post #7 of 9 Old 10-14-2019, 05:24 AM
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Quote:
Originally Posted by coderguy View Post
HDMI going bad from jolt of static electricity or live connection is 1 in a thousand at best, probably 1 in 100,000.
That is a cop out if a MFR uses that reason.

The usual reason for HDMI failures is heat from faulty cooling or bad voltage ran through the port at some point from an internal component (resistor/capacitor/diode going out of spec or failing), and it's usually the HDMI chip near the port, not the entire board, but you might not be able to get that part. Now this is across MOST other devices (receivers, etc...), cannot say that applies to this model and projector, but it usually applies to most devices. It's usually the memory registers in the chip that get damaged, but sometimes it's not even that, it's just a bad resistor or something similar, depends. It can be 3-4 different things, but I'm sure with projectors 1 of the 4 is most common (I don't know which one).
Have you repaired HDMI on projectors yourself? Personally, I was repairing, and not one, but several. What you say about 1000 or 100000 is not true. From a "hot" HDMI connection, any electronics spoils much more often, very often. These are game consoles, televisions, players, receivers, and of course projectors. What kind of resistors are you talking about? If the resistor burns out, it means a short circuit in the entire circuit. Resistors alone do not burn out! Recently I had an JVC X30 that someone was trying to repair. It was a nightmare. Apparently the repairman had heard enough stupid advice and blew the processor board. A resistor was also soldered there, in addition, a microcircuit that was working was soldered. I had to redo a few days, restore the board, after such stupid repairmen.
If you don’t have enough knowledge and experience, never try to do repairs yourself, all the more so complicated.

P.S. JVC X30, which I mentioned above, had a problem with HDMI.

Last edited by Slonopot; 10-14-2019 at 05:28 AM.
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post #8 of 9 Old 10-14-2019, 06:01 AM
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Resistors get out of tolerance and affect the Ohms which makes it impossible to handshake, and will cause things to appear dead.
Heat can burn anything out, even a diode. Burned up means anything that got too hot affecting its tolerance, it doesn't refer to something that literally melted to the board (though that can definitely happen, some types of resistors can even explode, but it is more common with capacitors to bust).

When things heat up too much, it changes the properties of the metal part which affects the resistance (among other things). Sure they make them heat resistant, but sometimes not heat resistant enough. The point is the component is no longer doing its job. Even the board itself and the electrical paths can be warped with enough heat over time. As far as being a complete short circuit, that is also possible but not very common. It certainly does not take a full short circuit to affect the HDMI signal, not even close. The digital encoding relies on the wave variance of the signal, and if this gets too far out of spec at any point, it will fail to be decoded.

There are literally thousands of posts in the receiver forums about failed HDMI ports, the HDMI boards fail because the MFR crammed too many parts too close together. The second most common reason is a faulty cheapo component on the HDMI board. As far as HDMI failing simply because of hooking and unhooking up live signals, this has been tested many many times by reviewers, and you can read about it online. It takes quite the jolt to fry an HDMI port this way. This about as common of a problem as USB ports failing from hot plugging, sure it happens, but it's certainly not common.

I'm not questioning your ability to repair an HDMI board, my point is sometimes the board doesn't even need replaced.
OF course anyone can replace the entire board, that's obvious, but that's too expensive, it's not even worth it.

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Last edited by coderguy; 10-14-2019 at 06:19 AM.
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post #9 of 9 Old 10-14-2019, 06:22 AM
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Quote:
Originally Posted by cgott42 View Post
My JVC RS400 just over 2 years old seems seems to have developed an issue - the picture doesn't show (just some strips of color on the top of the screen. First one HDMI port so I used the other, now the 2nd port does the same. Happened when I switched my Roku Ultra to 4K HDR 60Hz. I tried different inputs , different cables and without anything between the proj and inputs and the same thing. only the "Denon" sign when I connect to my AVR shows OK.

Does anyone have a rough estimate of what I can expect to repair (just out of warranty) - to know if it's worth to repair or resell as-is.
Truly a shame as the PQ is utterly stunning. I really loved it and just bought a Panny 824 to really see what it's capable of - wow! Really pissed, especially right outside the warranty period - I asked JVC if they'd make an exception and they said no.
Just for testing, get a device like a Roku stick and plug it directly into the back of the projector so there is no cable. That way you can know if the signal is just weak from the HDMI ports, or completely dead.

HDMI is a low-voltage signal (around 5 volts I believe), so the parts they make them with can generally handle an order of multitude higher than that voltage. So even a static pop on the port from rubbing your feet on the carpet isn't going to fry it most of the time. Sure if a device has a bad ground or bad voltage and is sending too much current to the HDMI cable, then hot plugging it will fry it, but that's just not common with high-end equipment. Unless you are hooking up some $5 chinese stereo to the back of your projector, it's not common.

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Last edited by coderguy; 10-14-2019 at 06:35 AM.
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