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Last edited by nomoresonys; 12-09-2023, 11:52 AM. -
Glad to hear it's fixed, thanks for the followup, appreciate it.
Last edited by nomoresonys; 12-09-2023, 11:52 AM.Comment
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I have same issue. are these readings with the mainboard and LED connected or without. can you show location of R355,R002,C338 on the board and why did you change them?Comment
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C338 is the little blue capacitor right next to EC203.Comment
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having a hard time spotting those resistors, wonder if they are tucked under one of the heatsinks, you see any?Comment
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Check out EC201 and EC210.Comment
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Read thread carefully, maybe try suggested in post # 9. After heating caps don't wait til it cools down try tv while it's still hot, youtube is your friend for how to videos, plenty there.Last edited by nomoresonys; 08-14-2024, 05:42 AM.Comment
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I have already changed EC210, old one was a bit bulged. I have the board out on a bench not connected to the main board. How do I test to see if issue is fixed or not?. When connected to power I am still not getting any voltage reading on LED connectors, not sure if I should. Thank you I found C338. BTW R355 in on the back of the board near the IC. I am not able to find R002.Comment
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Dirty test for electrolytic caps if no capacitor tester at hand, can use a multimeter set at about 20k ohms, tv UNPLUGGED, reading should gradually rise or fall, switch leads and should go the other way. You will know if you do the test correctly by the readings, can try it on a good cap that isn't installed also. As always be careful you don't want one of those caps zapping you, if you hold the power button down on tv for 30 seconds with it unplugged, it will help discharge the caps. Can test them with multimeter to be sure they are discharged. Good practice is just never touch anything on the HOT/DEADLY side with your hands.Last edited by nomoresonys; 08-15-2024, 09:44 AM.Comment
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So did you test that resistor? Don't forget to try the hairdryer test in post # 9.Comment
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I can not do test post 9. I have already replaced the capacitor but would like to know how to test the board to ensure the capacitor was the only issue. I dont have the TV right now, just the power board on a bench and the power cord.
What do I test & how to check if the board is working or not?Comment
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I am not positive how to test this board as stand alone, I'll have to defer to the other members.Comment
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I see an R348 near the LED connector but the rating on the board schematic says NC-0R. what does this mean? I dont see the resistor (probably tucked under the transformer) but I am getting an open circut when I measure it. any ideas
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NC on a datasheet means No Connect, open, floating.Comment
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Thanks.... however how do pin 3 in con301 and pin 1 in con302 function in the circuit to get the voltage needed by the LED lights?Comment
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Thanks again....But pin 3 in con301 and pin 1 in con302 are just connected to each other...they dont seemed to be connected ato any thing on the circuit board. I am getting 240-290 on the other pins when ready to PCB grounds. Again the pCB is not on the TV, it is stand alone when i do these readings.Comment
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That's right, that's how it should be, the LED strips are connected in series (like a garland, one LED burns out and all the others stop lighting...), the voltage is high because there is no load (the LEDs are not connected.Attached FilesComment
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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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Good day everyone,
Let me preface this with letting you know that I have a smalltime computer repair shop but do not have a lot of experience when it comes to board diagnostics. I am good at soldering etc but finding the issue if there isn't an obvious burnt component is not my strong suit.
The other day I got a customer come in with a macbook A1990 (motherboard 820-01814-A) that would not turn on and had previously been getting the warning message that the battery needed servicing. (Most folks seem to ignore that message, just like the check engine light in vehicles.)... -
Original fault was customer spilled milk on unit, no corrosion was found on the board. Took mainboard out of original case and LCD and swapped it into the fully functioning case and LCD.
Shorts show up all over the board when trackpad is connected only. Trackpad is used and fully functioning from another unit of same model. Voltage injection causes trackpad connector to get hot but nothing else, swapped on board connector to rule that out, same issue. Diode reading on IPD_MCU_INT_CONN is higher then reference board @ .935 expected is .803. Shorts show up on PPVBAT_AON_CHGR_REG and... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
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