here is the scenerio i plug in the tv i see the backlight flash for a second .i push power button i can see the backlight light for sec then it shuts offs.the power light will not stay on.I will post pictures tommorrow any ideas where to start testing or any one has run into this problem.
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Re: magnavox 37mf321d/37 backlight flashes for second
found bad ic chip on main board or scaler board same thing ic 7003 is burnt.i will post pictures soon.i was wondering if any one has replaced this ic .and is there any other components that should be replace when this chip burns. -
Re: magnavox 37mf321d/37 backlight flashes for second
Scroll down to Post #45.
https://www.badcaps.net/forum/showth...2mf231d&page=3Comment
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Re: magnavox 37mf321d/37 backlight flashes for second
thanks for link bill it had good information .Comment
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Re: magnavox 37mf321d/37 backlight flashes for second
What is the best way to remove this chip since it has solder under the ic 7003.i was thinking with hot air but was not sure if it would melt solder under ic or it it would damage the new ic chip by getting it hot enough so the solder under it would take when I install it.Comment
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Re: magnavox 37mf321d/37 backlight flashes for second
I'm off topic here, I appologize for that, but I would like toask you a favor, could you please give me the panel's model number? I'm looking for one for my Samsung TV and somewhere in a list this TV shows up that it's using the same panel. Thank you.
With the hot air will work, I have done it before. Don't keep it in one spot, do circles, and don't set it to hot.Comment
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Re: magnavox 37mf321d/37 backlight flashes for second
what be good temp to set it at.here pictur of panel numbers.Attached FilesComment
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Re: magnavox 37mf321d/37 backlight flashes for second
i removed the chip unfornately my patience ran out and i applied a little pressure on the chip and i lost the trace to one of the legs i was wondering if anyone can tell me if i can attach the copper i scraped a little off or is the the wrong place to solder to.any help would be appreciated.picture below is what i did wrongAttached FilesComment
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Re: magnavox 37mf321d/37 backlight flashes for second
looked at the diagram pin 6 looked like it is not used so i put tv back together turned on got image menu but i keep hearing a sizzling noise then i heard a pop.image gone took board off and ic popped.Comment
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Re: magnavox 37mf321d/37 backlight flashes for second
Thank you for the pictures, sorry about the outcome, you are sure you didn't have a short between pins? Did you checked your work with a lupe?Comment
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this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered... -
Hello everyone! I've found this television, and I began troubleshooting it.
First, the television kept rapidly power cycling. I've warmed up the capacitors with a hairdryer, and after 3 dimmed red blinks, the backlight turned on, then turned dim, and no picture was present on the screen.
I believed that this was caused by a bad power supply producing insufficent power (I've measured 3.5v on the 5.2v rail), so I've blindly recapped the board.
After the recapping, all the voltages stableized, however, the issue in the title still remains.
I could... -
Hello all,
Am trying to figure out this backlight issue with this A1990 Macbook Pro.
Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure... -
Hello, got an iPad Pro A2378 12.9 5th gen with no backlight. Got another test unit without screen, tested the screen, still no backlight with the test unit.
Figured out the backlight on the screen was bad, ordred a new backlight from mobilesentrix, *carefully replaced it* without damaging the lcd, oh well.
Final result, issue is still there, the screen has no back lights. So i'm back to square one, with 3 hours less and 100$ out, issue still on the screen.
The panel is still ok, i can see the apple in the middle of the screen when it kicks in, just no backlight.
Anyone...
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