There's some very smart folks on youtube, diving deep into how these boards work. In some basic ways they all work the same but of course there's just enough variance in some to make it complicated at times.
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I will. Is there any chance it could be the FA6B22N?? I was saying that there was 7 volts on the FB line, but am not sure if that is normal or possibly is keeping the IC from fully operating...Comment
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I posted a pdf in post 20. Your VCC supply is underestimated 10v, but it should be about 18-22vāAttached FilesComment
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I wonder if CP810 is ok.Comment
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If you have not, check DP802 and 803 Diodes on underside of board by the big caps. Also double check all those resistors, make sure none are open or drifted.Comment
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Thank you all, I will check tomorrow.Comment
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With power applied on the bench, CM814 and CM815 have 10VDC, equal to the VCC of ICM801S, but CM810 reads 0VDC. Not sure what role it exactly plays, but there should be something right? Sure would love a schematic! š¬Attached FilesComment
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I would switch it out. Sometimes it's just easier, specially if you don't have an accurate cap tester.Comment
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Seems like we covered most of the potential faults, if it's not a bad solder, resistor, cap, guess that leaves the pfc IC. Guess you can check it for a short. I believe there's only one ground, maybe check, with tv unplugged, neg probe on neg leg of filter cap/hot ground, positive probe on each pin of IC, make sure only one pin has continuity as in only one will show 0 ohms or beep in continuity/diode mode if meter has that feature, same as testing a fuse.Comment
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Well, if this is a frequent malfunction, check the other components that are in the Repair list...Attached FilesComment
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Well test QP802CS, should prolly test the same as QP801CS, the numbers on them are the same, yes?Comment
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It would be easy enough to change out all the parts listed at the bottom of that parts kit. Those 4 blue caps and the 2 transistors, one of which you already changed out.Comment
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I'm at a loss....everything I've checked seems ok, but I'm having trouble following the circuit to understand exactly where the 10VDC (that should be 14-29) is sourced from. It appears to start tapped off that big transformer and through a diode, but how is the TXFMR producing V without any switching happening. Does anybody have a schematic close to BN44-00874F?? Can anybody confirm that this board should be fully on when on the bench (like other samsung power supply boards), or do I need to install it?Comment
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Did you replace CM810?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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I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
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... -
I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.
I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.
The models launched in 2018 and 2019 respectively.... -
Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC...
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