Re: Vizio/LG E420VT
Again, IC601 is Infineon HS01G. That's is the ORIGINAL chip that was at that location. Are you saying it should not be there? It didn't look tampered with in the slightest, so that is what the board came with.
The kit which is wrong for this set, has no Infineon chips whatsoever. It does have an LD7571. Which is marked IC9801. You are the one thinking the chip is there when it's not. The PFC on this board is somewhere else, not at IC601.
Weird thing is there's not many ICs on this board, IC101 and U201 are also both SMPS...
TechShui
Senior Member
Last Activity: 10-23-2023, 03:28 AM
Joined: 06-12-2011
Location: Austin, TX
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Last edited by TechShui; 04-30-2019, 08:47 PM. -
Re: Vizio/LG E420VT
In post #9 you said IC601 is probably the PFC controller. It is in fact HS01G. Datasheet tells it's a half-bridge resonance controller.
The voltages in post #10 are with the original HS01G installed.
Datasheet: (same as the one you attached)
Only parts from the kit I installed are:
Blue ceramic cap at C604A
Main fuse was replaced.
And yes I did mess up and installed the kit's PFC at the location for what we now know is the SMPS.
TV turns on with it and LED stays white for a second...Last edited by TechShui; 04-27-2019, 10:20 PM.Leave a comment:
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Re: Vizio/LG E420VT
Okay but can't I fix it? Or is there no service manual?
I do see repair kits for it on eBay... What do you think of the voltages of the PFC all are okay? 15v at VCC.Last edited by TechShui; 04-27-2019, 08:20 PM.Leave a comment:
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Re: Vizio/LG E420VT
Yes that's my board. I ordered the board repair kit off ShopJimmy. But the designators are different I explained that in my Opening Post. This board does fit several TVs such as Insignia and LG but shouldn't the designators be the same?
Maybe they sent the wrong kit. But some of he components are the same like there is a PFC controller which I will probably replace. But instead of an Infineon HS01G it's a LD7591 (with designator IC9801 instead of IC601).
I tested the original PFC booster IC and it's got 15v at VCC....Last edited by TechShui; 04-25-2019, 06:26 PM.Leave a comment:
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Re: Vizio/LG E420VT
What do you want me to prove for the PFC boosted voltage? Is that one of the pins IC150?
Or is it on the underside of the power board?
And I still have no luck finding a service manual. What’s the best site for them? Is allservice.ro dead now?Leave a comment:
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Re: Vizio/LG E420VT
Speaking of standby mode, the TV comes on as soon as I plugged it in. So it never really has standby. I'm guessing something is sending the PWR_ON signal even when it shouldn't.
Want to try to avoid buying a new power board since they are pricey and hard to find but this feels pretty lost in the dark until I get a service manual for it.Leave a comment:
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Re: Vizio/LG E420VT
So does anyone have the service manual? I replaced C604A and now get a flickering backlight and loud buzzing from the transformers. Should I start looking at PFC or what next?
Diodes near the cap all seem okay
D601 and D601A are 596 one way and infinite other.
D603 (the diode mosfet under the heat sink) is 496 and infinity other way....Last edited by TechShui; 03-28-2019, 08:19 PM.Leave a comment:
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Re: Vizio/LG E420VT
Which component do you want to see? The resistor in question, right? I can zoom in on that but unfortunately my camera is not the best so I tried many times to get a full picture of the board but it still is a little fuzzy to read the designators (R275, etc) at that resolution.Leave a comment:
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Vizio/LG E420VT
It's a Vizio with LG parts. PSU seems to be a common fault since ShopJimmy is selling repair kits. I opened it up and found C604A toasted there's also a burn mark above R275 just below where it says LGIT E-series 42.
A little burnt near Diode mosfet D603 but perhaps that's from the same cap explosion because when I test the diode it reads fine. 443 one way and infinity the other direction.
One thing that bothers me is I'm getting almost no reading off the two resistors below the blown cap, R603/R604.
About .4 ohm at lowest setting on multimeter but... -
Re: Seiki SE50FY28 LED TV, no backlite
Do you still have these LED strips? You wouldnt happen to be near Austin would you? I have a Seiki with bad backlights, but it's a 47 inch. I'll start my own thread here soon. I'm wondering if the strips would even fit a smaller panel? Most likely not....Leave a comment:
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Re: Toshiba LED TV, blank screen
Where did you download the firmware update from?...Leave a comment:
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Re: Toshiba 32C110U1
Thats bizarre, are you getting any sound, like a pop from the speakers when you try to turn it on?
Im working on one of these same sets and its not powering on either but makes sound.
The only other thread on badcaps seems to indicate a high chance of mainboard failure, Im kind of leaning that way myself on this one.Leave a comment:
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Re: Magnavox 39MF412B, turns on for 10 secs then shuts off
Yeah, I read it this morning and it was a manual for a CRT TV.
For some reason that's only result that came up when searching for Magnavox A21T0UH
Does any one have the correct manual for Magnavox chassis A21T0UH?
Or know of a good source for Philips / Magnavox service manuals?Leave a comment:
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Re: Magnavox 39MF412B, turns on for 10 secs then shuts off
Sorry, I spaced out, and forgot to paste.
Voltages going from PS to mainboard (with set OFF):
[CODE]Pin 1
Pin 2 0v
Pin 3 6.9v
Pin 4 0v
Pin 5 0v
Pin 6 3.3v
Pin 7 18.2v
Pin 8 0v
Pin 9 6.9v
Pin 10 0v
Pin 11 0v
Pin 12 6.9v[/CODE]
Now, readings with the set ON
[CODE]Pin 1 0v
Pin 2 0v
Pin 3 11.9v
Pin 4 0v
Pin 5 0v
Pin 6 3.3v
Pin 7 27.2v
Pin 8 0v
Pin 9 11.2v
...Leave a comment:
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Magnavox 39MF412B, turns on for 10 secs then shuts off
It turns on long enough to see the logo/splash screen, and even the OSD for a second or two.
Voltages going from PS to Mainboard -
Re: Vizio VO32L, another one with bad VRs? Need help figuring out the resistors too
I thought so
You mean I only need to remove R36 and bridge the pads? (see photo please, [url]https://www.badcaps.net/forum/attachment.php?attachmentid=67824&d=1374772483[/url] )
Thanks!Re: Vizio VO32L, another one with ba...74772483[/url]...Leave a comment:
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Re: Vizio VO32L, another one with bad VRs? Need help figuring out the resistors too
A few more general questions.
Can someone tell me what the difference is between Low Dropout (LDO) regulators and Very Low Dropout?
I have another voltage regulator that I'm considering placing as u20, in the hopes of getting the correct 1.8v.
This one is a FIXED regulator, 1.8v, and labeled SC1565
Here's the datasheet:
[url]http://www.alldatasheet.com/datasheet-pdf/pdf/391299/SEMTECH/SC1565.html[/url]
The amperage is also...Last edited by TechShui; 08-11-2013, 10:11 AM.Leave a comment:
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Re: Vizio VO32L, another one with bad VRs? Need help figuring out the resistors too
Tom, thanks for your insight, i appreciate it
One thing that still leaves me scratching my head:
Original regulator is A1117, [URL="http://html.alldatasheet.com/html-pdf/138925/JIANGSU/CJA1117-ADJ/298/1/CJA1117-ADJ.html"]datasheet here[/URL]
I replaced with a spare G1117 that i have, [URL="http://html.alldatasheet.com/html-pdf/203653/GMT/G1117/52/1/G1117.html"]datasheet for that [/URL]shows the specs as identical*
From this can we conclude that one...Last edited by TechShui; 08-11-2013, 12:53 AM.Leave a comment:
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Re: Vizio VO32L, another one with bad VRs? Need help figuring out the resistors too
Sorry for long wait between responses, i do agree that the expected output voltage is 1.8v but why does a higher 2.25 v not allow the set to power on?Leave a comment:
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Re: Vizio VO32L, another one with bad VRs? Need help figuring out the resistors too
Yes, I figured as much, so what's the problem? Wrong resistor after all? Slight variance in regulator? Let me post a link to the datasheet hang onLeave a comment:
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