pls help help hp dv6-3357sf no light no power .

[mo000]

the problem cause is a laptop charger
the charger id pin gives 18.5 v
when the client plugs in the charger in the laptop the laptop dead .
hp dv6-3357sf quanta LX6
no power , no light .




PU5
1=18.5v
9=3.2v
CN15
brown wire =2.2v
red wires=18.5v
other wires =0v

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

is there any why to make a laptop run without charger circuit .

[Techtiger]

Re: pls help help hp dv6-3357sf no light no power .

is there any why to make a laptop run without charger circuit .

No but from the Battery it might work
Test continuity with the help of a multimeter PQ42 Drain to Source & Gate Short

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

resistor PR226 burns each time i plug in the charger .

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

No but from the Battery it might work
Test continuity with the help of a multimeter PQ42 Drain to Source & Gate Short

PQ42 work fine i replace it before but the same problem .

[Techtiger]

Re: pls help help hp dv6-3357sf no light no power .

Ok Remove PR226 and test the resistance both sides of the line
Test this point’s after to Resistance with Multimètre
+VAD

[jasko_jacker]

Re: pls help help hp dv6-3357sf no light no power .

Normally this motherboard requires (page 42 CN15) the AD_ID signal so you only use original or compatible adapters for this model. We should check if there is a short circuit + VA or + VAD or + VIN, check the ohms on those points with the multimeter.
Report the results

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

Ok Remove PR226 and test the resistance both sides of the line
Test this point’s after to Resistance with Multimètre
+VAD

i test the resistance both sides but no short circuit ; side gives 18.5v and other sides gives me a high ohms value because it's connected with capacitos .

i can't find pr139 for test VAD_1


but the pin 14 gives me 2.15v


and here

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

the motherboard and schematic are different
this is PU8


and this in blue circle suppose to be PU8


but a lot of components are missing like PD17 and pr124 pr141 ...

[on/off]

Re: pls help help hp dv6-3357sf no light no power .

High (no) Res Image LX6:



Edit: Look like someone whom was degrade the image resolution, original link at rusfolder was dead.
Note: if you got issue when extract it, try use 7zip.

[on/off]

Re: pls help help hp dv6-3357sf no light no power .

the motherboard and schematic are different
this is PU8

Seem All matched

Hope this helps

[Techtiger]

Re: pls help help hp dv6-3357sf no light no power .

the motherboard and schematic are different
this is PU8


and this in blue circle suppose to be PU8


but a lot of components are missing like PD17 and pr124 pr141 ...

yes this Schematic is Different mesure Voltage in this area , did you resistor PR226 ?

[on/off]

Re: pls help help hp dv6-3357sf no light no power .

• VH28 is output voltage from PU8 as voltage pump to activate PQ42 (need gate higher than source or drain).
  
• if PR226 blown then there is something in circuits, maybe PU8 (maybe other IC too) was broken.
  
• Need to check many net those point as per post7#
  
• Also make sure the charger known as good original adapter ( i think client charger has modify).

Note:

• I didn't see schematic different with real board....so confuse??
• * mark on schematic mean not installed.
• but if * then /S mean is short or pad jumper like PR131.

Boardview attached and datasheet

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

• VH28 is output voltage from PU8 as voltage pump to activate PQ42 (need gate higher than source or drain).
  
• if PR226 blown then there is something in circuits, maybe PU8 (maybe other IC too) was broken.
  
• Need to check many net those point as per post7#
  
• Also make sure the charger known as good original adapter ( i think client charger has modify).

Note:

• I didn't see schematic different with real board....so confuse??
• * mark on schematic mean not installed.
• but if * then /S mean is short or pad jumper like PR131.

Boardview attached and datasheet

thank you very much for your help
pu8 activate pq42 gate
PU8 Vout VH28=0v
because no vin

pr226 attached directly to pu8 i think the problem in pu8 .
is there any way to make the motherboard powered from the power ic directly without charge circuit .

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

• VH28 is output voltage from PU8 as voltage pump to activate PQ42 (need gate higher than source or drain).
  
• if PR226 blown then there is something in circuits, maybe PU8 (maybe other IC too) was broken.
  
• Need to check many net those point as per post7#
  
• Also make sure the charger known as good original adapter ( i think client charger has modify).

Note:

• I didn't see schematic different with real board....so confuse??
• * mark on schematic mean not installed.
• but if * then /S mean is short or pad jumper like PR131.

Boardview attached and datasheet

pr226 pass the vin to pu8 but pr226 burns
i make a jumber from pr226 point to pu8 vin pin but pu8 began to heat so much .

[on/off]

Re: pls help help hp dv6-3357sf no light no power .

thank you very much for your help
pu8 activate pq42 gate
PU8 Vout VH28=0v
because no vin

pr226 attached directly to pu8 i think the problem in pu8 .
is there any way to make the motherboard powered from the power ic directly without charge circuit .

I assume you have original adapter.
+PRWSRC and +VIN weren't short to ground.

• There is "good word" on this forum which tell us that The important is you know "How its work". Then you know why its failed.

AFAIK Rules mosfet on block charger:

• ACFET N-channel MOS required High on gate.(usually from pump ic charger or need external pump from other ICs-depend on circuit schematic).
• ACFET P-channel MOS required LOW ( usually have voltage from source/drain-depend on circuit schematic)

Required to laptop can turn on:

• +PRWSRC and +VIN have ~19V. as supply for LDO and other circuit regulator e.g 3V/5V and LED panel.
• PQ42 active/ON, gate required High than drain.
• VH28 approx ~25V-28V present via PR15 (check both side of PR15, present or not).

PU8

• PU8 should work and there aren't pinout have shorted (except pin21)
• input present and have output VH28.
• P2805PG present (3.3V), VSENSE( approx 2.2V) REG (12V)

PU5

• PU5 have input (pin1 VAC generated from +VA via PD8>PD6>PR67).
• Voltage on both VDDA/VDDP approx 5V
• ACAV present 3.3V and generate as ACIN signal via PR84.
• Also ACIN signal require for generate PQ19 (PNP-NPN on SC-74 package) so when pin 5 be ON, pin 2 be OFF, then +VAD cross to pin 6 PQ19.

• When +VAD present, PQ4 be ON via resistor divider PR192-PR228, Though VH28 present if this fet ON make PQ42 be OFF.
• ACIN signal require to make PQ3 be ON and PQ4 be OFF, then PQ42 be ON and generate +PRWSRC/+VIN

pr226 pass the vin to pu8 but pr226 burns
i make a jumber from pr226 point to pu8 vin pin but pu8 began to heat so much .

Pull out the PU8 and check all pin out of pad PU8 for shorted, if shorted gone replace PU8.

Note:

• Need check carefull, also double check for shorted.
• Don't apply power till short gone.

Hope you understand with my poor grammar

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

I assume you have original adapter.
+PRWSRC and +VIN weren't short to ground.

• There is "good word" on this forum which tell us that The important is you know "How its work". Then you know why its failed.

AFAIK Rules mosfet on block charger:

• ACFET N-channel MOS required High on gate.(usually from pump ic charger or need external pump from other ICs-depend on circuit schematic).
• ACFET P-channel MOS required LOW ( usually have voltage from source/drain-depend on circuit schematic)

Required to laptop can turn on:

• +PRWSRC and +VIN have ~19V. as supply for LDO and other circuit regulator e.g 3V/5V and LED panel.
• PQ42 active/ON, gate required High than drain.
• VH28 approx ~25V-28V present via PR15 (check both side of PR15, present or not).

PU8

• PU8 should work and there aren't pinout have shorted (except pin21)
• input present and have output VH28.
• P2805PG present (3.3V), VSENSE( approx 2.2V) REG (12V)

PU5

• PU5 have input (pin1 VAC generated from +VA via PD8>PD6>PR67).
• Voltage on both VDDA/VDDP approx 5V
• ACAV present 3.3V and generate as ACIN signal via PR84.
• Also ACIN signal require for generate PQ19 (PNP-NPN on SC-74 package) so when pin 5 be ON, pin 2 be OFF, then +VAD cross to pin 6 PQ19.

• When +VAD present, PQ4 be ON via resistor divider PR192-PR228, Though VH28 present if this fet ON make PQ42 be OFF.
• ACIN signal require to make PQ3 be ON and PQ4 be OFF, then PQ42 be ON and generate +PRWSRC/+VIN

Pull out the PU8 and check all pin out of pad PU8 for shorted, if shorted gone replace PU8.

Note:

• Need check carefull, also double check for shorted.
• Don't apply power till short gone.

Hope you understand with my poor grammar

first i found pin17 vh28 shorted with ground i take off the pc151 but the short still exist
i pull out the pu8 and the short gone .

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

where i can find P2806 ic .
is there any replacement .

[on/off]

Re: pls help help hp dv6-3357sf no light no power .

First find in your local store, or try ebay / aliexpress

• https://www.ebay.com/itm/5pcs-Brand-...-/171373268185
• https://www.aliexpress.com/store/pro...4b0b3761FRaJ4o

[mo000]

Re: pls help help hp dv6-3357sf no light no power .

finally after 6 days of pain i repair the laptop by change the ic p2806
and the laptop work fine
thanks for everyone helps me specially the member on/off
thank you very much .