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Have JVC TH-A10 Digital Theatre System. Unit won't turn on. Have verified power at outlet

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Thats a good start, work your way down the cord, have you opened it yet? If not and you are up to it, open it up and check fuses, they will need to be checked will a meter as the are usually covered with a fire retardent covering which prevents you from visibly checking the fuse, but not always. The fuse should be right inside where the cord goes to the first board.

Posted on Dec 12, 2008

  • Justin Washburn Dec 12, 2008

    I havent downloaded them but see if the pdfs here help at all.

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Hi and welcome to FixYa,

Initially, in the absence of any indicator that power is coming into the set, then the most likely culprit would be a fuse inline with the AC line. A blown fuse this early into the circuitry would indicate a probable power supply problem.

Alternately, it could be that the fuse is good but the standby voltage (normally +5VDC) is absent. This would also result into no display/indicator and further the system will not power ON. Again this would be in the power supply section.

This of course would require opening the unit, perform voltage measurements,determine faulty component and subsequent part(s) replacement. Further, a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 12, 2008

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Digital input not working and greyed out on the menu.


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JVC HDMI Port Fix

Turn the TV on, and enter the Service Menu. Select 2 for Self Check. Then turn the TV off, and after the fan turns off, unplug the power cord. Reconnect the power cord, turn the TV on, and the HDMI port is re-enabled.


Here's how to get to Service Menu:

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4 Answers

No sound on JVC AV-48P575 48 inch rear projection TV


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Mar 23, 2008 | JVC AV-48P575 48" Rear Projection...

1 Answer

JVC AV-48WP74


havent had time to check these things out but here is some raw research I have done

No. The CRT driver ICs are prone to shorting and cause this symptom (I just had one with those very symptoms and the green CRT driver IC was shorted). Disconnecting the CRT board does not clear the short on the board. Often then is a small burn mark on the CRT board under the affected IC (but not always). The IC should be a TDA6111Q. Be sure to note the proper position
of the IC as it should face with the letters TOWARD the heat sink!!!!

Larry, Check the CRT driver ICs on each of the CRT boards.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
Hi Guys, I don`t see many JVC`s and don`t have the print for this AV48WP30, went out this morning and as customer claimed on phone when you plug set in and turn on it makes a loud thump thump in both speakers 20-30 times then relay clicks, the thump stops, and blue idiot light on front goes dim/bright, dim/bright, have to unplug set to start this same scenario over again. Never develops HV or audio, Will order the service manual today, but would like to know if anyone has seen this before (should say "heard" this before)
I would disconnect each crt board and hv lead one at a time and try. Have seen several bad tubes on that model. The only other problem I have seen on that set is bad convergence amps, however that doesn't cause shutdown.
Perry Bower
Electric Medic
From Tech Repair CD:
JVC\AV48WP74\just went click*click*click when turned on Video drive IC (IC1101) on the red CRT module
shorted. It looked like bad solder on the B+ was the cause

Frequently Used Top Five Repair Parts by symptom code
MODEL NUMBER : AV48WP30 - TV
SYMPTOM CODE : DEAD
TOP FIVE PARTS :
2SC5552-RL
2SC5904-RL
QQH0113-002
STR-F6629B/F7
STK392-110
Above from JVC Web site, also I have seen shorted video drive IC's on the crt boards short and cause this symptom. Try unplugging the 200 volt source to the crt boards and see it the set powers up and stays on. There is a B+ relay which supplies 130 Volts to the horizontal output circuit. Is this relay energizing? I takes about five seconds after the power is turned on for it to energize. If a short is detected on the 130 volt line the blue power lamp on the front will do what you describe and the relay will pulse on and off. (David)

Symptom:
Non-functional Digital Input
Solution:
1. Power off the unit
2. Disconnect the digital input if it is connected
3. Remove the rear cover
4. On the digital input module, using a shorting pin (PC type) or a
jumper, short Pin 1 and Pin 2 of the
SB connector
5. Power on the unit
6. Unplug the unit and remove the shorting pin or the jumper
7. Re-attach the unit’s rear cover
8. Power on the unit, and input the digital source

Oct 10, 2007 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC 48" rear projection AV48WP30 is HAUNTED


Dear Losing Sleep, The symptoms you're describing sounds like a bad tac switch or two. You might notice a bit of a pattern also, consistent with temp changes. (ie: up in the early AM when house got cooler, and bingo set is on). It's not an expensive repair. Tac switches are an item under a buck a piece. However, this is NOT something you want to tackle yourself... This TV is actually built to self destruct if a less than educated tech opens the back. If you remove the rear cover while the power is on you will destroy all DVI programing inside the DVI (Digital Input Module). The only way to restore the programming is to send the unit to JVC. There is a light sensor inside the TV and when the back is removed with the power on the data is erased from the eprom. You might even take it an extra mile when calling around to find a shop to work on it by asking if they know the correct procedure for opening the back of your TV - - If they do know their answer will be something like this: First turn off set and remove power cord then short pins 1 and 2 on the SB connector of digital input module. Before replacing the rear panel remember to remove the short on the SB connector. Do not turn power on until the rear panel is inserted into the cabinet. If you have to work inside the set with power on remove the two cables going to the DVI module. When you find the right shop take the unit in yourself - you'll save a few bucks that way. Hope this helps. Bill

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