I have the same problem. I started looking at the power supply board but now that I have read the post i need to know what the digital board looks like.I have the same problem. I started looking at the power supply board but now that I have read the post i need to know what the digital board looks like.
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I have the same problem. I finally convinced JVC's tech support to help me out (they **** by the way) and I got the schematics for all the boards in the unit. From looking at them I believe it is the Digital Signal Board. I will post results soon.
The only problem I ran into is if you power the unit up with the cover off, it will lock out the HDMI input. This can be unlocked very easily. Follow these steps:
1. Bring up service menu (push sleep timer; while 0min is displayed press display and video status simultaneously).
2. Run self test.
3. While self test is on screen, power tv off.
4. Unplug unit for 1 minute.
5. Power on and verify HDMI operation.
Hope this helps.Replaced digital board and it works fine.
The only problem I ran into is if you power the unit up with the cover off, it will lock out the HDMI input. This can be unlocked very easily. Follow these steps:
1. Bring up service menu (push sleep timer; while 0min is displayed press display and video status simultaneously).
Hey hawg082, do you still have the schematics and/or why did you conclude it was the digital board? I have the exact same model TV, and it went black with the blue power light (normal constant on) is functional. Do I also need a new power supply? Please let me know if you can help out!Hey hawg082, do you still have the schematics and/or why did you conclude it was the digital board? I have the exact same model TV, and it went black with the blue power light (normal constant on) is functional. Do I also need a new power supply? Please let me know if you can help out!
No,if the power it is constant on and a solid LED power indication light. U check the power supply carefully no dying capacitor. 99.9% Tuner digital board it is dead.No,if the power it is constant on and a solid LED power indication light. U check the power supply carefully no dying capacitor. 99.9% Tuner digital board it is dead.
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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
it could be, this problem is commonly caused by defective power supply capacitors. I will assume that the replacement board is in good working order. The main board would be the next board to replace as it can mimic symptoms of a bad power supply. Just make sure you order the exact replacement part # on the main board. DO NOT ORDER BY TV MODEL #
I have the exact tv model and the exact problem.. replaced bad caps and still the same problem. no voltage on the backlight plug. and the blinking red led on the board.
Tries the tv unplug,replug the tv back an hour later,let the tv reset itself back to factory setting.The tv should work now.Not,than the power supply board is dead.That the board,where the power a/c plug into this board.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
You need to replace the power supply board. The new ones have a bigger heat sink - obviously JVC knows about the problem because they made the new ones bigger. It cost $250 from JVC and I installed it myself - took about 3 hours to do. If you are not tech savvy call a repairman. Hope this helps.
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
I have the same problem. I started looking at the power supply board but now that I have read the post i need to know what the digital board looks like.
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