Hi all. Have a DV4 for my wife that I literally got from a friend - decided to give my wife after fixing up. Realized that the screen doesn't come on and after opening it up it seems like a resistor is burnt. Problem is that I don't know the value or the number on the board. Any help finding this would be greatly appreciated. Thanks in advance.
-
-
Re: Help Finding HP DV4 Resistor
Can't edit my original message..........Here are the pictures bigger. Didn't realize clicking the thumbs here wouldn't open the page to the originals.
And direct links just in case as well.
http://s162.photobucket.com/user/kha...d388b.jpg.html
http://s162.photobucket.com/user/kha...22836.jpg.html
http://s162.photobucket.com/user/kha...9e938.jpg.html
http://s162.photobucket.com/user/kha...a6049.jpg.html -
Re: Help Finding HP DV4 Resistor
What is the full model number / main board number I have looked at the schematic for one DV4 and there are no components with that series of numbers.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
Re: Help Finding HP DV4 Resistor
put some isopropyl alcohol there and clean the area with a toothbrush
until the the schematic its hereJust cook it! It's already broken.Comment
-
Re: Help Finding HP DV4 Resistor
The full model of the laptop is DV4-1548dx.
Motherboard part number I think would be JAL50 LA-4105P.
Once I clean it up I'll take some other pictures and upload.Comment
-
Re: Help Finding HP DV4 Resistor
i think its a coil, not resistor.Comment
-
Re: Help Finding HP DV4 Resistor
I also think it may be a coil (Inductor) L6 or L7 ? I did find this from a LA-4101P so it may be very similar. Perhaps the OP can check out the other components to see if they match.
Until a proper schematic turns up.Attached FilesPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
-
-
Re: Help Finding HP DV4 Resistor
Try to compare which component goes where in schematics and then rule out the ones you can identify. Then you will see which component is it. Also check fuse F1!Comment
-
Re: Help Finding HP DV4 Resistor
I didn't check back here for a while - sorry - didn't get any email notifications for the subscription for some reason. Since then I've done a bit of checking and decided to try something. The missing resistor on the RIGHT in the LAST PICTURE was replaced using a 3.9 ohm resistor - I wanted to get 3.5 kilo-ohm but couldn't since the stores locally don't carry a large variety. Since I've done this the laptop screen has been working without an issue. It should be noted that though the resistor on the LEFT of the missing one is burnt I tested it and got 3.5 kilo-ohms from it. I need to do some verification and pics will follow later on. Maybe. Since it's already assembled and such. But if you guys think it will help for me to show the exact things I'll open it back up and show pics of the readings and everything. Or maybe I'll just do it for helping out.
In the pic posted I see where LVD8_A2+ and LVD8_A2- actually have continuity. On the points closest to them on the board where the burnt and missing resistor are I get continuity on either one.Comment
-
Re: Help Finding HP DV4 Resistor
So I checked a store and found 3.9K ohms resistors there - got myself two just in case. If this one fails then I'll put one of these in since they should be closer to the actual thing - I hope.Comment
-
Re: Help Finding HP DV4 Resistor
So with the 3.9 ohms resistor the screen works flawlessly when plugged in and occasionally trips out when not plugged in. I'll probably change it to one of the 3.9K ohms ones I have later today. When I do that I'll take pics and post how I did it.Comment
-
Hi
I am trying to repair an ancient Dell 2209WA Monitor which suddenly shut off with a pop sound. On investigation found that one of the fusible resistors had blown. Further investigation identified multiple components as faulty because of which the fusible resistor blew. Please refer the attached circuit diagram showing the components that were found to be damaged.
1. FR950 - blown fusible resistor - 0.2 Ohm 1W
2. Q950 - shorted Q950 MOSFET - 650V 10A N Channel Mosfet
3. R835 - Blown Resistor - 20KOhm SMD resistor
4. D930 - Shorted Schottkey Diode... -
Hi to all forum members,
Got this faulty 350 watt atx psu dirt cheap from a local online seller as i am keen to use it as a learning tool to repair faulty power supply.
The faulty part is quite obvious from the burn area near the 16pin KA7500 BD pwm. The fuse is still intact with good continuity.
Upon power on ac, there is 5vdc standby power on cathode of diode D14 and about 10vdc on cathode of diode D13.(This should be the aux power to generate the 12v and 5v rail.)
Initially i replace the two burned resistors near my marked red arrow to 200 ohm resistor... -
I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.
I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors... -
The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor https://www.youtube.com/watch?v=_J7_rV7ui1Y -
I have purchased an 100-240v AC/5v 2a DC adaptor from aliexpress,and a month ago It smelled burning when I plugin it powerstrip.
Since then, This AC/DC adaptor have been out of order.
But A few days ago,I replace 0.5 watt resistor with 1 watt resistor(1ohm) in this adapter.
After replacing resistor,It succeed to recharge all of android phone.And When I measure voltage on the two pins of USB port,It shows 5.5v
Is it okay to replace 1/2 watt resistor with 1 watt resistor in AC/DC adapter?
And Is there any possibility that it will suddenly explode as well as to be out...
Comment