Own a JVC Model 56G787 120V_60HZ recently replaced lamp, screen still too weak, control does not help, what to do ?

Either the A1 controls are misaligned or the tube is weak.

The lamp time reset will be or should be in the owner manual---Google the model number with keywords "lamp install" with the model number and the "manual" with the model number---Google can be a great help.

Hi,

The JVC 56G786 users manual will not give you a clear or specific answer about confirming bulb failure with the LED lamp or power indicators located on the front of the TV.

If the TV was operating normally for an extended period of time (months or years) and will not start, the problem is almost always bulb failure. If the "Lamp Replacement" warning previously appeared "On-Screen" and the TV will not start, bulb has failed.

The first step in a "no picture" situation with a JVC LCD Rear Projection TV is bulb replacement. There is no way to measure the bulb. Sometimes the bulb is visibly broken or damaged when it fails. Remove the lamp cage and have a look.

The JVC Lamp Gallery has all the JVC models and lamp numbers listed. There is also a link to DIY JVC bulb and lamp installation.

If a good bulb is installed correctly and the TV still does not start, you need a technician. There are no user serviceable parts other than the bulb. Failure of ballasts, power supply boards or controller boards is rare in these TVs.

easyab

I recently had to replace a lamp on my Epson projector. I was given the projector and had no idea what the cost of a new lamp was. I went to the Epson website to discover they wanted $450.00 for a new lamp! I went on Ebay and entered my product name, serial #, model #, & new lamp - I got one for $185.00. I suggest if you haven't already found one, to follow a similar path - and if the JVC site wants a fortune for the lamp - see what you can do on Ebay!

the problem you are having is with the light engine it is a comon issue on this type of tv. the reason you now notice it is before the lamp had grown weak so it wasn't vissible now the lamp is bright and you can see the discoloration the part you need is expensive but not to hard to replace yourself if you are careful

Hi,
Did you replaced lamp recently in tv?
Symptom shows lamp is getting weak in result and tv requires replacement.
Lamp replacement procedure is easy and would be written in user manual.
Thanks.

Hi,
If its Sony KDF-50WE655 TV then its weak lamp symptoms like TV turns off and on automatically and work for 3 minutes as you mentioned.
How old is this TV and did you replaced lamp recently?
Replace its lamp that is weak in result and causing TV off and on itself.
Lamp replacement procedure is written in user manual, very easy, click Sony Support to download copy, if required.
Please buy Sony original lamp for TV safety that is available in Sony Accessories Store under following part number for $200
A1606034B... LAMP BLOCK XL-2100U
If model number is different, let me know.
Thanks.

Symptom of weak lamp that needs to be replaced. Please replace lamp in TV.
How old is this and did you replaced lamp recently?
Thanks.

The HD-ila sets accumulate a lot of dust in the light engine. The worst offender is the little fold mirror just under the lens. I take my set apart about every 8 months or so to clean all the dust from the light tunnel and all lenses, mirrors, diffusers etc. The picture really regains it's pop when this is done. Unless you are a skilled technician though, I would recommend against attemptimg this procedure as you need to disconnect the individual color lcds. Check with a local service center to get it properly cleaned.

Versed, you have to open the back panel (cover) to access the lamp. replacing is easy as soon as you can see it. loosen the mounting bolt and pull to unplug the lamp from the SMPS Lamp power supply. Thats it.