i did something dumb

[spence]

I dropped my JVC RX777 receiver. The LED panel won't work now, even though the audio is just fine. I took it apart as much as possible to see if anything has just come undone, but all looks OK. I'm surprised how much it looks like a computer inside with all the plug in boards.

I know it's not a high end receiver, but it's all I've got now. Any suggestions would be helpful.

Spence

[Adrian]

I did a similar thing with a laptop once. What happened was I broke the tiny fluorescent light rod that served as the back light. Lighted LCD panels don't produce their own light and need these tiny bulbs to back light them. Try shining a flash light on the lcd pannel and see if it shows "activity" numbers changing etc. If thats the case you have to replace the backlight.
HTH,
Adrian
> I dropped my JVC RX777 receiver. The LED
> panel won't work now, even though the audio
> is just fine. I took it apart as much as
> possible to see if anything has just come
> undone, but all looks OK. I'm surprised how
> much it looks like a computer inside with
> all the plug in boards.

> I know it's not a high end receiver, but
> it's all I've got now. Any suggestions would
> be helpful.

> Spence

[klaus]

Get out the magnifying glass and a bright light. Inspect the PC boards for cracks. Any cracks will also tear copper traces on the board. Scrape off the green solder mask, get to bare copper, and bridge the crack with solder and a short length of wire. Solder alone is too weak.

Look very closely at all of the components and their solder connections. Repair any failed solder joints and replace any broken components.

These things are easily overlooked and very common in devices that stop working after being dropped. I’m lucky in that I have a stereo zoom microscope that works well for this kind of work.

Good luck.

> I dropped my JVC RX777 receiver. The LED
> panel won't work now, even though the audio
> is just fine. I took it apart as much as
> possible to see if anything has just come
> undone, but all looks OK. I'm surprised how
> much it looks like a computer inside with
> all the plug in boards.

> I know it's not a high end receiver, but
> it's all I've got now. Any suggestions would
> be helpful.

> Spence

[unknownuser]

> I did a similar thing with a laptop once.
> What happened was I broke the tiny
> fluorescent light rod that served as the
> back light. Lighted LCD panels don't produce
> their own light and need these tiny bulbs to
> back light them. Try shining a flash light
> on the lcd pannel and see if it shows
> "activity" numbers changing etc.
> If thats the case you have to replace the
> backlight.
> HTH,
> Adrian

I think he said LED not LCD. BTW, LED are semiconductors and are fairly robust. It's not often you can damage the LED itself. Most receivers have electro-luminesent(EL) display, which ARE sensitive to shock.

EL displays have high voltage circuits in them, so if you are not comfortable/experienced working with high voltage circuits, then don't even bother try disassembling anything.

Otherwise, unplug the power cord and wait a few minutes (10 min. or so). Check the connecting ribbon cable and make sure they are firmly connected. If it is connected firmly, try disassembling the panel and see if anything is loose. But, if anything's broken, then you're out of luck.


(Originally posted by: James Lee)

[Adrian]

He did say LED . . .
I do know what an LED is . .
Adrian

> I think he said LED not LCD. BTW, LED are
> semiconductors and are fairly robust. It's
> not often you can damage the LED itself.
> Most receivers have electro-luminesent(EL)
> display, which ARE sensitive to shock.

> EL displays have high voltage circuits in
> them, so if you are not
> comfortable/experienced working with high
> voltage circuits, then don't even bother try
> disassembling anything.

> Otherwise, unplug the power cord and wait a
> few minutes (10 min. or so). Check the
> connecting ribbon cable and make sure they
> are firmly connected. If it is connected
> firmly, try disassembling the panel and see
> if anything is loose. But, if anything's
> broken, then you're out of luck.

[robertcottiers]

> I think he said LED not LCD. BTW, LED are
> semiconductors and are fairly robust. It's
> not often you can damage the LED itself.
> Most receivers have electro-luminesent(EL)
> display, which ARE sensitive to shock.

> EL displays have high voltage circuits in
> them, so if you are not
> comfortable/experienced working with high
> voltage circuits, then don't even bother try
> disassembling anything.

> Otherwise, unplug the power cord and wait a
> few minutes (10 min. or so). Check the
> connecting ribbon cable and make sure they
> are firmly connected. If it is connected
> firmly, try disassembling the panel and see
> if anything is loose. But, if anything's
> broken, then you're out of luck.

I think your suggestion along with Adrian's is worth investigating,I am guessing the person really has an EL display and called it an LED display by mistake,perhaps he can clarify this.

Bob C.

Bob C.

[rory]

The term is Vacuum Fluorescent Display. My H/K receiver refers to brightness settings as VFD settings.

[Dirk]

> I think your suggestion along with Adrian's
> is worth investigating,I am guessing the
> person really has an EL display and called
> it an LED display by mistake,perhaps he can
> clarify this.

> Bob C.

> Bob C.

My vote would be VFD. But even then, if he's missing ALL lights, I don't think it's the display itself, but whatever drives the display or sends it voltage. I'd think it's specifically a ribbon cable / connection issue.

Unless something shorted out. Then it's time to start saving pennies.