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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-11-2014, 02:50 AM
Re: inspiron 15r no backlight but voltages seem OK

You'll never believe it but I got the backlight working by bridging the two test points mentioned above, connecting ground to the LCD ribbon shield and removing two LEDs from each bank of 9. It flickers a bit and uniformity isn't great but there's a problem with the LCD panel!!! >

It is divided into three distinct horizontal sections, the middle section looks right, the left section darker than usual and the right section brighter, it's not the backlight because the change is too sudden. What the heck is that ...

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 11:49 PM
Re: inspiron 15r no backlight but voltages seem OK

Although I guess that probably will use too much power because it won't be pulsing?
I don't know seems a shame to throw out a perfectly functioning HD LCD panel.

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 07:34 PM
Re: inspiron 15r no backlight but voltages seem OK

What if I bridge the v_out and v_led test points? Try and cram 19v directly into the LEDs? Or is there a better way to do that?

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 08:42 AM
Re: inspiron 15r no backlight but voltages seem OK

Even if I replaced the protection ic it would just blow again. Seems these panels might have an issue based on the number of 15r n5010 threads. Super annoyed

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 04:28 AM
Re: inspiron 15r no backlight but voltages seem OK

Replaced fuse and protection ic went up in smoke.

Whole panel is cactus now I guess?...

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 04:02 AM
Re: inspiron 15r no backlight but voltages seem OK

I shall replace

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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-07-2014, 01:11 AM
Re: inspiron 15r no backlight but voltages seem OK

I tested F401 shown in image and there was no continuity, is it meant to be a fuse??

I'll await someone's confirmation since last time I jumped the gun.

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Last edited by frosty3907; 10-07-2014, 01:40 AM.
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frosty3907 replied to inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-06-2014, 11:25 PM
Re: inspiron 15r no backlight but voltages seem OK

Here's another photo but my eyes can't quite make out the chip number.

The LCD panel model is B156HW02 V1, h/w: 4a by au optronics
D/pn 035k06

Link to datasheet here but I can't download, needs registration.
[url]http://www.panelook.com/B156HW02%20V1_AUO_15.6_LCM_parameter_688.html[/url]Re: inspiron 15r no backlight but vo...y au optronics...

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Last edited by frosty3907; 10-06-2014, 11:29 PM. Reason: hw4a
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frosty3907 started a topic inspiron 15r no backlight but voltages seem OK

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-06-2014, 11:07 PM
inspiron 15r no backlight but voltages seem OK

Can see screen with flashlight only.
Dismantled and checked voltages on LCD controller board:

LED_EN 3V
V_OUT 0V
V_LED 19.3V
PWM 2.85V
YVCC 2.43V
LB1~8 0V

no voltage at any of the pins on the ribbon connector going to the LEDs.

This is a quite new laptop....

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Last edited by frosty3907; 10-06-2014, 11:08 PM. Reason: forgot the image
frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-22-2014, 08:58 AM
Re: 2 seconds until black - please help before I blow something up!

Sorry last bump, I'm going to try shorting some of the little ceramic capacitors near the protection ic , if this is a really bad idea please let me know

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-19-2014, 03:08 AM
Re: 2 seconds until black - please help before I blow something up!

So no other ideas?

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 11:10 PM
Re: 2 seconds until black - please help before I blow something up!

Perhaps.. But it does come straight back up and powers the lamps for two seconds.

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 07:40 PM
Re: 2 seconds until black - please help before I blow something up!

Is there any point replacing the large caps? Think they're 35v 470uf - I have three 50v 470uf laying around but not four, is mixing different voltage caps a bad idea?

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 07:19 PM
Re: 2 seconds until black - please help before I blow something up!

Drops to around 18v at the instant it turns on but immediately goes back to 23.5v for the two seconds and after.

Pretty sure it's the same adapter that came with the monitor so it should be in spec.

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 06:58 PM
Re: 2 seconds until black - please help before I blow something up!

Last time I used this screen was many years ago, it worked fine but I cracked the LCD while moving, I've since kept it in storage with the intent of using the backlights for something.

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 05:38 PM
Re: 2 seconds until black - please help before I blow something up!

3.09v

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-16-2014, 12:30 AM
Re: 2 seconds until black - please help before I blow something up!

This looks super useful but I'm not seeing anything immediately wrong or explaining the shut down?

E: also thanks for your help so far

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-15-2014, 10:40 PM
Re: 2 seconds until black - please help before I blow something up!

Yes there are no control signals being sent.. The FCC cable connectors are marked:

NA2
GND
NB2
GND
VSENS
STATUS
FBML
STB
FBS
A-DIM
24V-ON

DIM-SEL
NC
PWM-SYNC
SELECTION

the on/off I'm using is on the 24v connector though.

I don't remember what panel it was..
The inverter is pw-cw42bo(or 0)-m(t) rev 0.7

lc420wx5

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-15-2014, 10:16 PM
Re: 2 seconds until black - please help before I blow something up!

Although I should note that I don't have the original logic or power boards installed anymore. I have the master and slave inverter and the t-con board.
I don't think I have the other boards anymore.

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frosty3907 replied to 2 seconds until black - please help before I blow something up!

in Troubleshooting TVs and Video Sources

09-15-2014, 08:32 PM
Re: 2 seconds until black - please help before I blow something up!

Hi, I was previously trying with 24v to both boards with the exact same results. Also had the FFC connected, was just removed for the photos.

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inspiron 15r no backlight but voltages seem OK

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