alextech
Member
Last Activity: 04-03-2025, 06:56 PM
Joined: 10-06-2018
Location: Fort Worth, TX
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Hello my name is Alejandro, i have done very little hardware repair stuff, i have YouTube channel about some hardware repair stuff but know very little. I am here to expand my knowledge on hardware -
Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok, I apologize for the misinfo, I believe my PCH is on short, but I need someone to verify this. I made a video to see what is going on.
[url]https://youtu.be/2A7OSi33mQo[/url]Re: HP dv7-7133nr No Video Problem G...OSi33mQo[/url]Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
I need to make a correction PL4601 is NOT .480 ohms, it is .480 k ohms. I apologize for the misinfo, as of now is it possible I have a resistor problem? Could this explain why PU4006 is dropping voltage?Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
I need help, I changed the super io because the power controller (PU4103) PIN 8 and PIN 14 was on .011 in diode mode with black on ground. Now, pin 8 and pin 14 have .859 in diode mode.
I still have another problem, PL4601 still has .480 ohms on that rail, with coil off pin 2 has .480 ohms. I checked for the cause and I could not find it. Anybody know why this rail has a very low ohms reading?
PU4601:
2 13.86 ohms
5 .480 ohms (.242 in diode mode)
6 15.27 ohms
7 10.13 ohms
8 7.86...Last edited by alextech; 02-17-2019, 12:10 AM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Guys, I found PT4601 on short again and PU4602 was on short. I replaced with good ones. Also I found PU4603 getting hot first when injecting voltage on PR4001 and checked again after removed and PU4602 got hot. I checked off board for short on these 3 components and those 2 were shorted. At this point I do not know what else to check. I uploaded a text file with ohm readings on a lot of components. What do you think?...Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok here is what I learned based on what someone told me, if I inject 19v to gate on PU4006 I would get 1.6v slowly and then goes up to 4.7v on SOURCE pin 1. But this is on the original RT8223M power controller. As I was told I should change the power controller again because PIN 17 was indicating a short and therefore I changed to an equaivalent power controller TPS51123 and now I get 1.6 to 2.4v and it goes up and down when I inject 19v on gate PU4006. On this new ic chip, I get 1.7 ohms on pin 17. What could be my problem? I believe...Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Could my buck regulator (TPS51219) be bad? Someone told me this gives feedback to the power controller chip, is this true? Maybe this is what was making the switching noise, perhaps I got confused since its nearby?
UPDATE: I cannot find TPS51219 on this board, I did find PU4501 (SN1003055RUWR) though, not sure is it has anything to do with power controller.
PIN 1 - 5 ohms and goes up
PIN 5 - 14 ohms
PIN 13 - 96.7 ohms
PIN 14 - 9.95 ohms
PIN 16 - sometime OL but then changed to 16 ohms...Last edited by alextech; 01-26-2019, 10:42 AM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok, so technically I did try 1v and 1amp the first time, but no amps were loaded and thats why I tried 5v and 1 amp next. As for the bios making switching noises, this is not meaning that it is bad? PU4004 I removed it (not lifted) and I noticed it gets 19v but drops to 0v then goes to about 8v and then again 0v and then stops and I reconnect charger and does the same thing. About PC4118, I removed the cap and replaced it, not knowing the exact reading but I placed it by same size. At this point, I cannot understand why there is a short...Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok, I feel like it is more likely going to be the bios chip (U6002) that it is making a clicking noise, I checked on the oscilloscope and probe pin 1 and it looks like its bouncing a tiny voltage. There is also a 2 pin transistor (D2704) that is right next to it, but I do not think is going to be that one. It is also making a tiny voltage bounce like the bios, but I doubt is that.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
On the video you can see that when I plugged in the charger it went to 19v and kept dropping voltage. On the gate I get 3 ohms, I also tried another charger and has same result. So should I inject voltage on DCBATOUT like PR001 pin 2 to find what is getting hot? And how much voltage do you recommend?
Update: I injected 5v and 0.1 amps loaded and I can hear like a transistor clicking near EC9717, not sure exactly what it is yet but I will try to figure it out.Last edited by alextech; 01-24-2019, 05:52 PM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Here I am testing voltage on PU4004 gate on oscilloscope, take a look:
[url]https://youtu.be/bNYZvbAImX0[/url]Re: HP dv7-7133nr No Video Problem G...ZvbAImX0[/url]Last edited by alextech; 01-23-2019, 05:36 PM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
If you want me to check PU4006 gate on the pad, do you want me to check voltage? and what is the expected voltage? Also does this require to jump drain to source again? So are you saying that just because the charger outputs 19v, it doesn't mean the charger is good? I do not believe the charger block is the culprit though, I have tried with linear power supply....Last edited by alextech; 01-22-2019, 06:56 PM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
I tested continuity on PU4006 PU4004 PU4005 PQ4009 PR4001 like you said and no short found and no beep.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok I changed PU4602 and dont have reading on leg 4 anymore. But, PU4603 now has a reading of .000 on legs 1-4. Should I change this one now?Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
I tested PU4602 and this is the only one that I found that has a reading of some value on pin 4. You said "pin 1", but pin 1-3 should be the same? All had value on 1. But here is the strange part, I took it off and it did not have value on the pin 4. What is going on here, this transistor is near where the short occurred. I checked the pin 4 on the board without the transistor it blinks 6.9 ohms and OL back and forth....Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
2nd mosfet
pin 1 -3: between 3.7 - 3.9
pin 5-8: 19 ohms and slowly drops
red on 1 black on 5 - 3.5 ohms
red on 1 black on 4 - 10.8 ohms
red on 5 black on 4 - 17.5 ohms
I put back 1st mosfet source has 19v but drain is 0v. PR4001 is 0v. No light on the charger.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
PL4001 - 6ohms
PL4601 - .47
PL4102 - starts at 6.8 ohm and random ohms between 2 and goes above 12 ohms
PL4101 - starts at 6 ohms and goes up.
PL4801 - starts at 13 ohms and slowly goes down
I posted a video of PR4001 ohms and voltage check and charger IC spark reaction:
[url]https://youtu.be/u-2hSiiSb_g[/url]
@on/off DC-IN JACK LIGHT I made a video of ohms on PR4001 but in video put PR4010, I meant to say PR4001. Pin 1 is 19 ohms and slowly goes down. Pin 2 is 5.8 and slowly goes...Last edited by alextech; 01-21-2019, 12:30 PM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
Ok I changed PU4005, also I noticed that when there is light on the charger there is about 5v on pin 17 and 2v on pin 2 3 4 and pin 8 has 3v. Then when the light goes off it has 0v.Last edited by alextech; 01-20-2019, 01:23 PM.Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
red on 1 black on 5 - 1.3 ohms
red on 1 black on 4 - 5.92 ohms
red on 5 black on 4 -11.58 ohms
@techtiger, the schematics for Power Controller should be RT8223M not RT8223A....Leave a comment:
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Re: HP dv7-7133nr No Video Problem Goya/Balen
I checked PU4005 pin 1-3 is random sometime 3 ohms and sometime 5 ohms. Pin 4 is OL and 5-8 is about 10 ohms. I don't understand why PU4103 is not working, I would have to order another one. Could there be another explanation why PU4103 is not working? What about PC4119, could that be the problem? Charger IC chip has correct voltage PU4005 pin 1-3 0v pin 4 9v and 5-8 0v. PC4119 0v....Last edited by alextech; 01-19-2019, 06:08 PM.Leave a comment:
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