Re: finlux 42flhk240bhd no backlight
Perhaps a little help
Perhaps a little help
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Re: finlux 42flhk240bhd no backlight
Thanks for that.Comment
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Re: finlux 42flhk240bhd no backlight
WOW! - yes thanks Kilroys - great find.
MikeyBe if you open the pdf using adobe you can search it
If you just type BL into the search you can pretty much see the way it goes to the EN pin.
Also it has the pinout of the connector so we can get going on that. Only slight problem at this end is I am out most of today.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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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: finlux 42flhk240bhd no backlight
Well I've leant something...
What I thought was 3.3V is ST_BY. Also, the 7.6V is on the DIM_PWM_ANALOG line... However, I don't think that diagram is 100% identical to by power supply. Pin 11 of PL200 doesn't appear to be connected to anything, however pin 9 has 5V on it.
Still it's making life so much easier.Comment
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Re: finlux 42flhk240bhd no backlight
Can you measure that vCC on IC303 as you switch the set on the 11.4v is ok when it is running but as budm says it needs to go higher than that on startupPlease 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: finlux 42flhk240bhd no backlight
When first plugged in I get 21V, which after a few seconds drops down to 11.4V, if that makes sense...Comment
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Re: finlux 42flhk240bhd no backlight
That is OK, that is more thane enough start up voltage which is 18V, once it starts running then voltage can be anything between 11V ~25V range. Since you are getting standby 5V, then it is working (if the pinout of the connector matches the diagram).Last edited by budm; 08-07-2014, 03:00 PM.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: finlux 42flhk240bhd no backlight
One thing to be careful of: if you are using an auto ranging meter it can overshoot on turn on, to avoid this you need to lock it on to the range of interest. Most budget autoranging meters suffer from this (Fluke, Agilent, my B&K etc do not...) If the meter is not autoranging this is not a problem.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: finlux 42flhk240bhd no backlight
My test equipment at home is limited - a couple of basic non autoranging meters and an aging digital storage scope.Comment
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Re: finlux 42flhk240bhd no backlight
That is fine then, we know the meter is not causing this fault for sure if it is not an auto-ranging meter... just something to be aware of.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: finlux 42flhk240bhd no backlight
BTW, do you have that 24-80VDC at L200, the voltage is generated by SMPS IC201, TRANSFORMER TR200?
And also do you have voltage at VCC pin 16 of the ICMP3394?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: finlux 42flhk240bhd no backlight
Well the TV is working...
I resoldered anything that looked iffy. Also, the larger caps that were glued onto the PCB with what looked like black mastic had come away and lifted several PCB tracks with them. Repairing those appears to have got it working again.
Thanks for everyones help.Comment
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Re: finlux 42flhk240bhd no backlight
Wow! well done - and we gained quite a bit of information here.
Hope it keeps going for youPlease 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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Hello guys!
My Finlux TV backlight stopped working. I disassembled the TV, saw I don't have the tools to replace the backlight and assembled it again without replacing anything. So then the backlight started working again.
A day after it is also not working.
I decided now to remove the back cover and get the output voltage to the backlight. I placed the TV facedown and connected to the mains, so - nothing. I disconected, removed the cover and connected again to the mains and then the backlight lighted again. So strange.
Output voltage when light is 66V.
Board: VESTEL... -
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 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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