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Вы здесь » Ремонт ноутбука своими руками. » HP, Sony » Hp compaq 6830s enabling-disabling +V5A and +V3A

Hp compaq 6830s enabling-disabling +V5A and +V3A

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  • Автор: mohkamtun
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Hello,

Got for repair a dead Hp compaq 6830s. +V3AL was shorted. Traced line, replaced KBC1091 and short was gone.
Now, VREG3 and VREG5 are ok, but +V5A and +V3A are absent. EN1 and EN2 are 0V.

Got a little confused and wish to be clarified on the following points :

*1-how +V5A and +V3A are unabled and disabled through Q1036-Q1037 and Q1038 ?
see attached portion of scheme.

*2-R1242 is marked "0_5%_OPEN" on scheme. On the mobo, there are 2 soldering pads but no resistance found. Should R1242 remain open or need to solder a 0_5 R to help issuing EN1 and EN2 signals ?
http://sh.uploads.ru/t/qvizd.jpg

Отредактировано mohkamtun (15.04.2015 14:57:37)

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mohkamtun написал(а):

*1-how +V5A and +V3A are unabled and disabled through Q1036-Q1037 and Q1038 ?
see attached portion of scheme.
*2-R1242 is marked "0_5%_OPEN" on scheme. On the mobo, there are 2 soldering pads but no resistance found. Should R1242 remain open or need to solder a 0_5 R to help issuing EN1 and EN2 signals ?

:confused:

Drawn kind of nonsense  :suspicious:

Judging by the diagram, +V5AL through R1242 goes on EN2 and EN1.
It is unclear what function does Q1038

Channel 1 and Channel 2 SMPS enable pins. Connect to 5 V to turn on with internal 3-ms soft-start.

If there are no +V5AL , this may be due to the fact that open Q1038 or Q1036 and Q1037

If you remove R1242 , what voltage will be included EN1 and EN2 ?

:dontknow:

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It works like this :

+V5AL goes to the gate of the Q1038
Q1038 open
+V5AL through the open Q1038 go to the ground
On EN1 and EN2 goes nothing.
Receives signals VCC1_POR#_3 and KBC_PW_ON
Q1036 and Q1037 -   open
+V5AL through Q1036 and Q1037 goes to the ground.
Q1038 - closes
+V5AL through R1242 arrives at En1 and En2

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  • Автор: Сеган
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R1242 is not on the chart, it is marked on the "open" is a common bridge.
+ V5AL through R1243 opens Q1038 and extinguishes all the 5 volt line, but as soon as the Q1036 comes from the earth, the Q1038 is closed and 5 volts through R1242 goes to ENABLE1 and 2

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freeqwer написал(а):

It works like this:

+ V5AL goes to the gate of the Q1038
Q1038 Open
+ V5AL through the Open Q1038 go to the Ground
EN1 and EN2 On goes nothing.
Receives signals VCC1_POR # _3 and KBC_PW_ON
Q1036 and Q1037 - Open
+ V5AL through Q1036 Q1037 and goes to the Ground .
Q1038 - closes
+ V5AL through r1242 arrives at En1 and eN2

It's now clearer, but to be most clear :question:
1*-Are both VCC1_POR # _3 and KBC_PW_ON signals needed for issuing En1 and
En2 ?
2*- VCC1_POR # _3 is issued automatically through LM393 when +V3AL, +V5AL are present, but what makes KBC_PW_ON issued from EC, is it ADP_PRES ?
3*- So R1242 is necessary for issuing En1 and En2 ?

Then :

Сеган написал(а):

R1242 is not on the chart, it is marked on the "Open" is A common Bridge.

R1242 is marked on the scheme 0_5%_OPEN, what exactly _OPEN marking means, does it mean small resistive bridge?

Thank you for putting light on these points ?

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mohkamtun написал(а):

Are both VCC1_POR # _3 and KBC_PW_ON signals needed for issuing En1 and
En2 ?

yes

mohkamtun написал(а):

but what makes KBC_PW_ON issued from EC, is it ADP_PRES ?

Don't worry your head.
This is just one of the signals triggering 51120

mohkamtun написал(а):

So R1242 is necessary for issuing En1 and En2 ?

yes

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  • Автор: Сеган
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freeqwer написал(а):

R1242 is marked on the scheme 0_5%_OPEN, what exactly _OPEN marking means, does it mean small resistive bridge?
Thank you for putting light on these points ?

OPEN this means that the element is not installed.
it is not needed, because it 0 Ohm.

Отредактировано Сеган (17.04.2015 01:29:21)

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Сеган написал(а):

R1242 is not on the chart, it is marked on the "open" is a common bridge.
+ V5AL through R1243 opens Q1038 and extinguishes all the 5 volt line, but as soon as the Q1036 comes from the earth, the Q1038 is closed and 5 volts through R1242 goes to ENABLE1 and 2[

Сеган написал(а):

OPEN this means that the element is not installed.
it is not needed, because it 0 Ohm.

Now again I'm getting confused, when Q1038 is closed 5 volts gets through R1242  ohm, if R1242 isn't installed and not needed OPEN, how 5volts En1 and En2 will be issued ? particularly given that on mobo there is no direct track from +V5AL line to drain to be able to do without the O Ohm R1242! :confused:

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  • Автор: freeqwer
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mohkamtun написал(а):

Now again I'm getting confused, when Q1038 is closed 5 volts gets through R1242  ohm, if R1242 isn't installed and not needed OPEN, how 5volts En1 and En2 will be issued ? particularly given that on mobo there is no direct track from +V5AL line to drain to be able to do without the O Ohm R1242!

Сеган wanted to say that R1242 is a resistor with a resistance of 0 ohms .
And instead of this resistor it is possible to put the jumper.
But in any case, this circuit must be a closed circuit . Because this resistor is fed a positive voltage to turn on EN1 and EN2

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:cool:

It's clear now. My thanks to you and to Segan.

Feed back :
Ok added missing R1242 to circuit, got EN1 and EN2=2V, so the +V5AL supply  to R1242 collapses in 2V. Suspected TPS51120 and desoldered it.

Before it's replacement, I connected adapter in order to identify the malfunction of Q1031, which I previously shunted.

At this stage, a tragic problem happened, a smoke came from U1007 Lan Controller, also, +V3_LAN and +V3A rail were shorted to gnd ? a phenomenon that I couldn't undertand as no voltages should exist, when TP51120 is removed, except the +VBATP, do you agree ?
Also found resistance of +V5A to gnd very small : 29 Ohms ?

Removed smoked U1007, and traced thoroughly +V3A line : found and removed shorted Q27,  U1021 and U1017 but +V3A SHORT is not yet gone ?

1*-So, what probably happened to kill simultaneously Lan Controller, Q27, U1021 and U1017 though TPS51120 was removed ? :confused:
:question:
2*- What else to check to solve short issue on +V3A rail ? Already supplied rail with  +3VDC power supply, didn't find any component which heats !

3*- How to solve +V5A line "29 Ohms resistance" to gnd ?

Unfortunately lot of steps back in this repair, as a result of this tragic problem! :smoke:

Thank you for giving good steps to solve these issues .

Отредактировано mohkamtun (21.04.2015 01:58:32)

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You deleted TPS51120 and turned on the laptop ?

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freeqwer написал(а):

You deleted TPS51120 and turned on the laptop ?

Yes, I turned on laptop with TPS51120 removed for the reason mentioned and that caused the tragic problem described on my previous post with no clear reason.?

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To turn on the laptop without the PWM controller-never !

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without PWM TPS51120 Q27 and Q31 launched 19 Volts on the motherboard. (mosfets opened)
19 Volt caugt on +V5A  and +V3A  - clear now?
almost everything that touches these lines - dead  :insane:
Now, the repair will be very difficul :tired: t

Отредактировано Сеган (21.04.2015 22:22:34)

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Сеган написал(а):

without PWM TPS51120 Q27 and Q31 launched 19 Volts on the motherboard. (mosfets opened)
19 Volt caugt on +V5A  and +V3A  - clear now?
almost everything that touches these lines - dead  
Now, the repair will be very difficul  t

Отредактировано Сеган (Вчера 20:22:34)

I connected adapter thinking that, as TPS51120 is removed, Gates of Q27, Q31 and Q30 are not driven, so the 3 mosfets will be closed and no voltages will be outputted on +V5A and +V3A lines, and that's why I was surprised by the big damage!

:question:
1*- If I have good understood, you confirm that, though gates are open (not driven by any signal), 19V supply should be present on outputting coils ?

2*- If yes, then shall I conclude that I must never connect adapter when any of the  system regulator IC (those supplied with +VBATR) is removed ?

Thank you for following up the 2 above questions.

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  • Автор: Сеган
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mohkamtun написал(а):

1*- If I have good understood, you confirm that, though gates are open (not driven by any signal), 19V supply should be present on outputting coils ?

Yes. They sometimes remain open briefly, it is enough to have passed 19 V ...

mohkamtun написал(а):

2*- If yes, then shall I conclude that I must never connect adapter when any of the  system regulator IC (those supplied with +VBATR) is removed ?

Yes. Never. if you are using the same principle shemes.

You can turn on after removal of the MOSFETs Q27 and Q31

do you speak Russian?

Отредактировано Сеган (22.04.2015 22:51:37)

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Сеган написал(а):

Yes. They sometimes remain open briefly, it is enough to have passed 19 V ...

Yes. Never. if you are using the same principle shemes.

You can turn on after removal of the MOSFETs Q27 and Q31

Clear (+V3A/+V5A) Regulator Ic is required or have to remove upper mosfets, before turning on, but :

Wish to know precisely if any damage is expected, when powered on with PWM TPS51120 soldered, but VCCP or +VDD_CORE OR +VCC_CORE regulator Ic is removed?

Сеган написал(а):

do you speak Russian?

Unfortunately, I don't speak Russian, but besides english I speak french, italian, german, arabic, a little spanish, some sentences in finish language and some words in Russian, as I studied Russian language for some months but many years ago.

Отредактировано mohkamtun (22.04.2015 23:57:31)

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  • Автор: Сеган
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It is strange that you do not seek help for English-speaking forums. Why?

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Сеган написал(а):

It is strange that you do not seek help for English-speaking forums. Why?

I posted in different english speaking forums, but most of replies I got were from beginners.  As I already studied laptop repair chip level and got experience in the field for some years, I need professional help to improve my knowledge and that's what I'm thinking to get in your forum.

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Hello,

I asked in my post 17, whether any damage could happen, when powered on with PWM TPS51120 soldered, but VCCP or +VDD_CORE or +VCC_CORE regulator Ic is removed?.

Thank you

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  • Автор: Сеган
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mohkamtun написал(а):

Hello,

I asked in my post 17, whether any damage could happen, when powered on with PWM TPS51120 soldered, but VCCP or +VDD_CORE or +VCC_CORE regulator Ic is removed?.

Thank you

GATE of the transistors to hang in the air should not.

Отредактировано Сеган (24.04.2015 01:24:59)

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Сеган написал(а):

GATE of the transistors to hang in the air should not.

Edited Segan (Yesterday 23:24:59)

Thank you for your advice.

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Hello,

Well, as I found many components shorted, think it's not worthwhile to continue  repairing this mobo. Took another clean but dead 6830s mobo for repair, +3.3V and +5V are absent.

Will dig and give feed back soon.

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