I have here hp g6 uma version DAR33HMB6AO REV:A laptop. the problem is cannot power on, Ive checked voltages NBSWON1# missing on PIN19 on u14 and on cn7 power button connector no 3.3v on pin4 and same with cap c59 connected to it, upon checking,Ive notice resistor R442 only have 2.7k supposed to have 10k, so ive replaced with 10k resistor same happen,checking resistor R51,R439 AND R441 have good value.only r442 is not measured 10k, anyone can help this please
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Re: Hp g6 laptop
anyone can help? -
Re: Hp g6 DAR33HMB6AO REV:A
PU13-pin13 & 15 Voltage??Comment
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Re: Hp g6 DAR33HMB6AO REV:A
pin 13 12v pin15 3vComment
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Re: Hp g6 DAR33HMB6AO REV:A
anyone can help on this pleaseComment
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Re: Hp g6 DAR33HMB6AO REV:A
You have EC_PWROK/RSMRST#/LIDSW#/?? +3VPCU_EC is present on L52? Bios flashed?Comment
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Re: Hp g6 DAR33HMB6AO REV:A
EC_PWROK present 3.3v on u13 RSMRST# is present on U14 +3vpcu_ec is present on L52 and c676 cap, already done flash bios that i got here in this forumLast edited by String2016; 12-11-2021, 03:41 AM.Comment
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Re: Hp g6 DAR33HMB6AO REV:A
I noticed R442 measure 8k dropping to 2.8k, already tried changing with 10k resistor but still it drops to 2.8kComment
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Re: Hp g6 DAR33HMB6AO REV:A
R442 is only a pull up so value isn't overly important. You should have 3.3V on the power switch, shorting to ground when pressed. This logic change should be visible on the EC at pin 19. If you don't have 3.3V, check with P7 disconnected and check voltage across C59 and pin 19 of the EC.Comment
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Re: Hp g6 DAR33HMB6AO REV:A
no voltage on pin19 of u14 ec and no voltage on C59Comment
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Re: Hp g6 DAR33HMB6AO REV:A
ON CN7 no voltage on pin4 pin3 have 3.3Comment
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Re: Hp g6 DAR33HMB6AO REV:A
Confirm you have +3.3PCU voltage on one side of R442, and check voltage other side. If it's low, and P7 is disconnected, it's either being pulled down by C59 or the EC. Also check continuity from R442 to pin 19 of the EC.Comment
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Re: Hp g6 DAR33HMB6AO REV:A
Done checking +3v3pcpu voltage on R442 one side have 3.3v other side has 0.400v,check pin 19 on ec beeping on R442 one side which has 3.3v, tried check R59 no short , and tried removiing R59 and check R442 still form 10k drop to 3k something is pulling down the resistorComment
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Re: Hp g6 DAR33HMB6AO REV:A
anyone can helpComment
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Re: Hp g6 DAR33HMB6AO REV:A
Barring some kind of track damage, it seems pin 19 of the EC is pulling it down. It's not clear which EC you have, as block view is a KB3930 whereas on pg 30 its a KB3940. I don't believe the latter needs programming.
Try replacing the EC is the next step.Comment
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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... -
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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...
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