What is the correct way to measure PFC voltage, I have a Hitachi Plasma Im gonna start trouble shooting.
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Re: How to measure PFC (Startup) Voltage?
Across the large 450V capacitors.
Note - PFC voltage is different voltage from the startup capacitors voltage often found around PFC ICs.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. -
Re: How to measure PFC (Startup) Voltage?
+ probe top of cap, - probe to ground? Forgive my ignorance, not trying to spark 450v.Comment
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Re: How to measure PFC (Startup) Voltage?
across cap, so red probe on positive and black probe on negative, you do not want to probe relative to ground as that is a meaningless reading.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.Comment
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Re: How to measure PFC (Startup) Voltage?
How do you test it in circuit, tv powered up? I get no reading across these large caps.Attached FilesComment
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Re: How to measure PFC (Startup) Voltage?
Are you sure those are main filter caps for the PFC Voltage booster circuit?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=24809Comment
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Last edited by selldoor; 02-26-2014, 03:52 PM.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: How to measure PFC (Startup) Voltage?
I figured that is what he meant about "across the cap" being in circuit. Set does not power up fully, goes into protection after about 6 seconds. I get NO voltage through out the power up process on my meter. Model # P60x901Attached FilesLast edited by topfli8979; 02-26-2014, 04:27 PM.Comment
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Re: How to measure PFC (Startup) Voltage?
Those are the VSUS caps for the sustain voltage, I think.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.Comment
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Re: How to measure PFC (Startup) Voltage?
From what I can find on the interweb, the sub power supply is on left, main on right.Attached FilesComment
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Re: How to measure PFC (Startup) Voltage?
To me, it looks like the sub PSU generates the PFC voltage, so you could try probing across that black/white cable running between the two.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.Comment
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Re: How to measure PFC (Startup) Voltage?
Verify if the Black wire does go to the Positive leg of the cap and the White wire does go to the Negative leg of the caps, otherwise it can be HOT (Black) and Neutral (White) for primary side of the circuits.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=24809Comment
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Re: How to measure PFC (Startup) Voltage?
Verified black wire is ground, 380 v steady at the black/white plug. Caps to the right of plug are still not showing anything on the meter.Comment
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Re: How to measure PFC (Startup) Voltage?
That reading sounds about right. What's the actual fault with the unit?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.Comment
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Re: How to measure PFC (Startup) Voltage?
Power tv up, fans/boards come on for about 4 seconds, goes into protection. Flashing blue led on front, no prime on the screen. Main supply has a high pitched sound coming from it.Comment
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Re: How to measure PFC (Startup) Voltage?
Count the blue blinks, error code should be in service manual.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.Comment
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Re: How to measure PFC (Startup) Voltage?
Yep, already did that,according to manual xsus bad. I have disconnected everyboard only way I can get it to fully power up and stay running is to disconnect c613 plug from main digital to power supply. Main board is good though, tried it another tv, operates as it should. I assume if xsus was bad, the tv would power up with out shutting down with the x disconnected.Comment
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Re: How to measure PFC (Startup) Voltage?
You assumed wrongly... sorry, this is a Hitachi, and they are terrible for repairability!
If a Hitachi plasma has an XSUS fault it will also give an XSUS fault with the board pulled. Great way to confuse.
You will probably find a bad FET on the XSUS.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.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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Hello friends,
Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.
I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I...Today, 04:41 PM -
i have Gigabyte Z490 Gaming X Motherboard .it has a power on no display fault .. no vcore voltage and debug led stuck CPU LED .
VCCIO voltage ok
VCCSA Voltage OK
VCCPLL Voltage OK
Ram Voltage ok
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VPP 2.5 OK
But No Core Voltage
and i want to this vrm ic datasheet or pinout (ISL69269)
anyone have this ic pinout voltages?...06-25-2025, 07:19 AM -
I'd like to start out by thanking this forum for providing the info to be able to repair my 15 year old CP1500AVRLCD UPS. Here is all the info I gathered during my trouble-shooting and re-capping.
Like clockwork, I've had to replace the SLA batteries every 4 years. It was about that time and the UPS was acting like it needed new batteries... randomly shutting off with AC present, not being able to charge fully, and poor runtime when AC was removed. So, I replaced the batteries but noticed that it was not charging properly.
I decided to verify that the batteries were... -
I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them
The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly
Now...
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