Hp 6730s (605A2161001-MB-A02) no power no charge

[eniac22]

Hp 6730s (605A2161001-MB-A02) no power no charge, its working ok with battery only, i have 19.70V on Q1032 pin 1,2,3,4 & 0V on pin 5,6,7,8.
I have make a trick i break connection of pin 4 (Gate, Q1032) and now its working.
On pin 3 of the dc port (Limit_Signal) i get 0V
The problem is with the Limit_Signal, how can repair this?

Schematic moved to new thread - https://www.badcaps.net/forum/showthread.php?t=124724

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[Techtiger]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

Are you using the original 90W adapter, Voltage on U1021 all pin except GND, voltage in R 53 both sides

[eniac22]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

First i want to tell you a big THANK YOU because you always try to help me.

The adapter is the original and and is mark as 18.5V but its output 19.5V, i have try and universal adapter.

With the Q1032 soldered correcly (no break on pin4, no battery connected) i have 0V on U1021 & R53.
With pin 4 of Q1032 not connected (system off,no battery connected) i have the follow voltage
R53 = 0V (both sides)

U1021:
pin 1 = 2.25V
pin 3 = 0V
pin 4 & 5 = 4.97V

Thanks

[Techtiger]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

Very complicated mob there are a lot of +3VAL & +5VAL , Test your charger middle pin outside of the mob, may be LM393 is faulty May be test R1338

[eniac22]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

The middle pin on universal charger is 3V & on original is 0V, how many volts must be the middle pin? Because i have 0V on the pin 3 (midle pin) of DC Port i will try to change the dc port

[Techtiger]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

The middle pin on universal charger is 3V & on original is 0V, how many volts must be the middle pin? Because i have 0V on the pin 3 (midle pin) of DC Port i will try to change the dc port

HP power adaptor middle pin has around 10-19V while Dell has up to 5-6V onewire (digital ID) communication

[piernov]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

Out of circuit HP adapter will appear to have 19V on center pin. When connected to the board, the AD_ID pin (center pin) will be between 0 and 3V. It works as a voltage divider, upper resistor in the power brick between 19V and center pin, lower resistor on the motherboard between center pin and ground.

[Techtiger]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

Out of circuit HP adapter will appear to have 19V on center pin. When connected to the board, the AD_ID pin (center pin) will be between 0 and 3V. It works as a voltage divider, upper resistor in the power brick between 19V and center pin, lower resistor on the motherboard between center pin and ground.

thanks Piernov

[eniac22]

Re: Hp 6730s (605A2161001-MB-A02) no power no charge

Problem solved, thanks all for your help