Hello All. I have a Hitachi plasma that is blowing capacitors. I have a picture of the capacitors attached. This is a new capacitor that I just installed. I replaced the y buffers and that allowed the tv to turn on and stay on. After the tv is on for a few minutes, the screen starts to fade and then boom!! Any ideas?
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Hitachi P50V701 blowing capacitors
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Re: Hitachi P50V701 blowing capacitors
Voltage is too high, or wrong polarity?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Hitachi P50V701 blowing capacitors
Originally posted by KevinCro View PostThe new capacitors have negative black written on them. What does that mean? All the other labeling is identical to the original capacitors
Remove the cap and show us good clear picture of where the cap goes to, there should be big white band close to one of the two holes on the board for the cap.
is this the first time you do the cap replacement?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Hitachi P50V701 blowing capacitors
This is the second time I've replaced that cap. The first cap almost blew as well, but I thought it was because i ran the tv for too long with the lower buffer board removed. The tv was probably on for 4 minutes or so. I found a picture of the board online and made sure that my negative leads were in the right hole. My guess is that there is a bad component on the ysus. I'll pull it and check it over. Thanks for the help.
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Re: Hitachi P50V701 blowing capacitors
If the cap is put in correctly then it must be the Voltage problem that caused the cap to blow like that.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Hitachi P50V701 blowing capacitors
I was using the va/vs on the harness to check. My voltages are way high but my DMM was found to be defective so I need to retake them with my new fluke.
http://assets.shopjimmy.com/media/ca...2202-top_1.jpg
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Re: Hitachi P50V701 blowing capacitors
Those readings are with both buffers running. The first cap blew with the lower buffer removed. Since then, I have replaced both buffer boards. I tested the voltage at the connector on the x board. The voltages were a bit lower than what the panel sticker reads. Is it possible that a component has failed on the psu restricting the flow of the current and causing the capacitor to overload?
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Re: Hitachi P50V701 blowing capacitors
I wish I could offer some advice, but boy I bet that capacitor was loud. I've blown up some small ones but nothing that size. Even a 470uf at 35v can make one heck of an explosion.
I have one of those power supplies sitting here and double checked your polarity and it appears to be correct.
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Re: Hitachi P50V701 blowing capacitors
I've been studying the circuitry of the psu and the capacitor that keeps blowing appears to be directly downstream from an identical capacitor that is not blowing. Does this mean that the problem is downstream from the blown capacitor? Possibly on another board? I'm lost at this point.
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Re: Hitachi P50V701 blowing capacitors
WE really need good clear pictures - have you checked for solder bridges that might touch when heated and have you clipped the capacitor leads close to the board - make sure it is not shorting on anything. Are the caps from a reputable source- where?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740
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Re: Hitachi P50V701 blowing capacitors
Could it be a counterfeit capacitor? I've had them before, a 450V one that violently vented on me... it was a "Nihoncon" in exactly the same font as Nichicon!Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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