How to diagnose and repair onboard RAM memory issues -Lenovo laptop coming on with no picture repair

Summary

En este video, se trabaja en la reparación de un portátil que no muestra imagen, aunque parece encender correctamente. Tras revisar voltajes y componentes clave como el chip BIOS y la memoria RAM integrada, el problema se detecta en una soldadura defectuosa de la RAM. Se muestra el proceso para probar y reparar las conexiones de los chips de memoria mediante el uso de calor y flux. Finalmente, se logra solucionar el fallo y el portátil vuelve a funcionar correctamente, destacando la importancia de revisar las conexiones antes de culpar al BIOS o la CPU.

Takeaways

• 🔍 El video trata sobre la reparación de una laptop con problemas de pantalla en 4K.
• 🔌 Se menciona que la laptop tiene una corriente de carga de 900 miliamperios, indicando que la batería está casi completamente cargada.
• 🖥 Al presionar el botón de encendido, la corriente aumenta a 1.9 amperios y las ventajas giran, pero no hay imagen en la pantalla.
• 🔍 Se sugiere que podría ser un problema con la BIOS, pero antes de eso, se debe verificar la placa base.
• 🔌 Se examina la placa base con un multímetro para verificar la presencia de voltajes en varios puntos.
• 💾 Se menciona que los nuevos laptops tienen RAM integrado, por lo que no es necesario preocuparse por la memoria RAM en este caso.
• 🔩 Se sugiere que los soldaduras rotas entre las memorias RAM pueden ser una falla común y es una de las cosas a verificar.
• 🛠 Se demuestra cómo presionar cada chip de memoria para verificar si hay alguna que esté causando el problema.
• 🔥 Se explica el proceso de reflow de los chips de memoria usando colofón y un soplete.
• 🔧 Al final, se identifica que uno de los chips de memoria era el problema y se resuelve reflowándolo.
• 🎥 Se invita al espectador a suscribirse y dar like si les gustó el video y se anuncia que se verá en el siguiente video.

Q & A

¿Qué problema estaba experimentando la computadora portátil que se menciona en el guion?

La computadora portátil tenía un problema para encenderse y mostrar una imagen en la pantalla a pesar de que el ventilador giraba y el botón de encendido mostraba señales de actividad.

¿Qué herramienta se utilizó para medir el flujo de corriente en la computadora?

Se utilizó un multímetro para medir el flujo de corriente en la computadora.

¿Cuál era el nivel de carga de la batería de la computadora portátil?

La batería estaba casi completamente cargada, mostrando aproximadamente 900 miliamperios.

¿Qué indicaba el problema al momento de presionar el botón de encendido?

Al presionar el botón de encendido, el multímetro mostraba una subida en la corriente hasta 1.9 amperios, pero no había salida de imagen en la pantalla.

¿Qué sugiere el guion para hacer si el bloqueo de mayúsculas (caps lock) no funciona?

El guion sugiere que si el bloqueo de mayúsculas no funciona, podría ser un indicio de un problema con la placa base o la memoria RAM.

¿Qué se hace para verificar si hay voltaje en los componentes de la placa base de la computadora?

Se utiliza el multímetro para verificar la presencia de voltaje en los distintos puntos de la placa base, incluyendo el suministro de alimentación principal y los suministros de voltaje para la memoria RAM.

¿Qué significa el término 'Reflow' utilizado en el guion?

El término 'Reflow' se refiere al proceso de reaplicar el soldadura a los componentes de la placa base, usualmente mediante el uso de un hornal o un soplete, para reparar soldaduras rotas o débiles.

¿Qué pasos se siguen para realizar un Reflow en una memoria RAM?

Para realizar un Reflow en una memoria RAM, se aplica flux y se calienta la memoria hasta que el chip comience a moverse, lo cual indica que el soldadura se ha derretido y se ha reaplicado correctamente.

¿Qué sugiere el guion para hacer si el Reflow de una memoria RAM no resuelve el problema?

Si el Reflow de una memoria RAM no resuelve el problema, el guion sugiere probar con el siguiente chip de memoria, ya que podría ser un problema específico de un chip en particular.

¿Qué se hace después de realizar un Reflow para enfriar la placa base rápidamente?

Después de realizar un Reflow, se usa una almohadilla térmica para enfriar rápidamente la placa base y evitar que se doren los componentes debido al calor.

¿Cómo se puede determinar si un problema de memoria RAM está resuelto?

Se puede determinar si un problema de memoria RAM está resuelto al observar si la computadora se encende y muestra una imagen en la pantalla, y si el sistema operativo carga normalmente sin congelarse o mostrar líneas en la pantalla.

Outlines

00:00

💻 Reparación de laptop sin imagen

El video comienza con el presentador probando una laptop que no muestra imagen, aunque parece funcionar bien: el botón de encendido se ilumina, los ventiladores giran y las corrientes suben. Comienza explicando el procedimiento de diagnóstico, como verificar los voltajes en diferentes partes de la placa madre usando un multímetro. Todo parece estar bien con la alimentación y la CPU está caliente, lo que indica que recibe energía. Sin embargo, no hay imagen en la pantalla, lo que lleva al presentador a pensar en posibles problemas de la BIOS o la RAM.

05:01

🔧 Diagnóstico de soldaduras de RAM defectuosas

El presentador introduce la posibilidad de un problema con las soldaduras de los chips de RAM incorporados, una falla común en las laptops modernas. Comienza a probar presionando los chips de RAM uno por uno, explicando que esto puede ayudar a detectar soldaduras agrietadas. Al presionar algunos de los chips, nota que aparece una imagen en la pantalla momentáneamente, lo que confirma que hay un problema de soldadura en los chips de RAM. Este descubrimiento guía el siguiente paso: volver a soldar los chips afectados.

10:03

🔥 Proceso de resoldado de los chips de RAM

El presentador demuestra cómo resoldar los chips de RAM defectuosos. Utiliza un poco de fundente y aplica calor hasta que los chips de RAM se mueven, lo que indica que las soldaduras se han vuelto a fundir. Explica que es importante enfriar la placa rápidamente para evitar daños adicionales. Sin embargo, después de realizar el resoldado en el primer chip, la laptop no muestra imagen. Esto lleva al presentador a intentar resoldar otros chips de RAM para solucionar el problema, señalando que el proceso debe ser cuidadoso para no dañar la placa base.

15:04

🛠️ Resolución final y prueba de funcionamiento

El presentador resuelve el problema resoldando los últimos chips de RAM. Después de completar el resoldado de los cuatro chips, la laptop finalmente funciona correctamente, mostrando imagen sin congelarse. Explica que el problema era una soldadura agrietada en uno de los chips de RAM. Con la reparación completa, vuelve a ensamblar la laptop y verifica su funcionamiento una vez más, asegurándose de que la pantalla funcione incluso cuando flexiona la placa. Termina el video aconsejando a los espectadores que prueben bien antes de asumir un problema de BIOS o CPU.

Keywords

💡Multímetro

Un multímetro es un dispositivo que mide diferentes parámetros eléctricos, como voltaje, corriente y resistencia. En el video, el técnico usa un multímetro para verificar los niveles de voltaje en varios puntos de la placa base del portátil, confirmando que las corrientes son correctas y que no hay problemas evidentes en el suministro de energía.

💡RAM integrada

La RAM integrada se refiere a la memoria que está soldada directamente a la placa base, en lugar de estar instalada en módulos extraíbles. El video menciona que los portátiles más recientes tienen RAM integrada, lo que significa que no se puede cambiar fácilmente, y en este caso, un problema con las soldaduras de los chips de RAM integrados está causando el mal funcionamiento del dispositivo.

💡Reflujo

El reflujo es el proceso de aplicar calor para derretir las soldaduras y reconectar componentes electrónicos que tienen fallas en sus conexiones. En el video, el técnico utiliza este proceso en los chips de memoria RAM que tienen soldaduras agrietadas para restaurar las conexiones y hacer que el portátil funcione correctamente.

💡Voltaje

El voltaje es la diferencia de potencial eléctrico entre dos puntos. Durante el diagnóstico del portátil, el técnico verifica diferentes niveles de voltaje en varios puntos de la placa base, asegurándose de que estén dentro de los rangos esperados para identificar posibles fallas.

💡Chip BIOS

El chip BIOS contiene el firmware básico que controla las funciones iniciales del hardware cuando se enciende el equipo. En el video, se menciona la posibilidad de que un problema con el BIOS esté afectando el funcionamiento del portátil, pero finalmente se descarta como causa principal.

💡Condensadores

Los condensadores almacenan y liberan energía eléctrica en circuitos. Aunque no se observa un problema directo con los condensadores en el video, el técnico revisa su estado como parte del diagnóstico general para asegurarse de que estén funcionando correctamente.

💡EC chip

El EC chip, o 'Embedded Controller', es un chip que gestiona tareas de bajo nivel, como el manejo de la energía y los controles del teclado en un portátil. En el video, el técnico menciona que este chip no parece estar causando el problema, ya que todo parece funcionar correctamente en ese aspecto.

💡Problema de pantalla

El problema principal en el video es que el portátil enciende pero no muestra imagen en la pantalla. Esto lleva al técnico a revisar diferentes posibles causas, como problemas de voltaje, la RAM y el BIOS, hasta descubrir que la raíz del problema está en las soldaduras defectuosas de los chips de RAM.

💡Memoria congelada

La memoria congelada es cuando un sistema deja de responder debido a fallas en la memoria RAM, causando que el dispositivo no procese correctamente la información. En el video, después de presionar un chip de RAM defectuoso, el técnico observa que la imagen en la pantalla se congela, lo que indica un problema en esa área.

💡Cargas eléctricas

Las cargas eléctricas son la cantidad de electricidad que fluye a través de los componentes. El técnico mide varias cargas a lo largo del video, verificando que los niveles de corriente sean los esperados para cada componente, como la batería y los diferentes chips de la placa base.

Highlights

Setting up a top camera for recording in 4K

Exploring a microscope that supports 4K resolution

Laptop from a local repair shop with an undiagnosed issue

Laptop charging at 900 milliamps with a nearly fully charged battery

Fans spinning and power button lighting up but no display

Checking the laptop with a multimeter for voltage readings

Voltages seem fine but no display on the screen

The caps lock light is not working, hinting at a potential issue

Checking the board for voltages and finding them present

CPU is hot, indicating that voltages to the CPU are likely good

No picture on the screen despite all checks being fine

Considering the possibility of a BIOS issue

Testing the laptop without the battery yields the same result

Reflowing RAM chips as a potential solution to the issue

Successful reflow of a RAM chip resulting in a display

Identifying a faulty RAM chip by pressing it and observing system behavior

Reflowing all four RAM chips to fix the issue

Final test shows the laptop working correctly after reflowing

The process of reflowing and testing each RAM chip step by step

Final conclusion that the issue was with the RAM chips, not the CPU

Transcripts

hello so whereby then this time in 4k so

I set up my top camera and four here I'm

recording on 4K very soon a microscope

came around 4K so we're trying you know

just to push the things

yeah

okay what do we have here we have a

laptop this comes from our local repair

shop

uh they tried to figure that was the

problem they couldn't figure it out so

the issue with this one check that you

have like 0.9 yeah let me bring the

multimeter on screen

uh so he's charging fine 900 milliamps

probably the battery is nearly fully

charged okay nothing wrong here now you

can see the charging light there let's

press the power button pressing the

power button

we can see the lighter on the power

button you can see the current is going

up to 1.9 amps the fans are spinning

everything is fine but no picture now

yeah I know what is the problem that's

the reason why I start the video

but let's assume you have this job

how you'll fix it

what you'll do so basically the router

is going to go but no picture on the

screen huh

what about the cops look

caps lock is not working

I'm just you know give you some hint

now what you will do and you will say

sorting

the first thing what I'll do I will

check the board yeah check to see some

voltages some things here let's have a

look so we have the multimeter on screen

what do we have here

uh

we have the main power let's see

no this is the 3.31 second what is the

main part of it

I'll still be somewhere here

uh 18.5 took on screen here we have is

present

so the main part is present right okay

the voltages let's see on this coil we

have

on this Square we have one volt here on

this coil

or test point we have 0.9 here we have

3.3

here we have 1.8

here we have 5 volts 5.1

this is the charging coil and we have

50.7 yeah the level of charging fine

here we have

1.2 1.191 1.2 volts probably this is the

ram power supply here

here we have

3.3 okay

here we have

uh

uh should be 2.5 yeah it is 2 2.5 on Raw

memory

and everything looks fine here we have

first two mosfets we have the current

sensor so everything is fine yeah 18.5

so what you will do in this case

um

yeah I said here we have one volt we

have few more coils here but we can't

reach them is the BIOS shape the bioship

has wow this is hot

um

the buyer's chip one second

1.8 volts here you can see on the screen

the bar shape has voltage we have

onboard the ram I don't think we have

Ram here let me check

probably not

no we don't need because we have onboard

Ram yeah the new laptops they all have

on board Ram

okay so what is the way to go from now

on let's be honest yeah and try to

answer this question sorry

I check looks like every Powerade is

present okay

what we are doing how we are dealing

with this I mean I can unplug the

battery I can start the laptop without

the battery same story

let's see pressing the power button

you can see the laptop is coming on it's

taking one amp without the battery yes

so the board is one I mean we check the

voltages all are present the CPU is hot

that's mean the the voltage on the CPU

probably are good

you can see what up call me go no

picture

so what you'll think

you'll think sorry

the best way to go for our with this

laptop

what about bios yeah can be a bias

problem can be can be

can be yeah

but before the bias yeah before the bias

let's just give me give you a tip yeah

just let me give you a tip so clearly we

can see there's no picture yeah

let me just give you a tip before yeah

because yeah we check the voltages

everything is fine before you go to the

buyers here because that's the next step

let's be honest that's the next step

okay let me try to

you know the AC chip looks fine it's

charging so it's listening the power

button is no AC chip issue you can see

the EC chip here clearly can be a bias

especially uh like Amy's Emmy region

from inside of the BIOS okay can be a

problem

but before that yeah

this is a board with onboard Ram yeah

check here okay I mean the voltage is

right it is right but how we are

checking what about if the because this

is a common fault actually crack solders

between the ram memories yeah how we are

checking something like that

so

you can have a look I mean

looks anything weird there like you can

see anything weird to the RAM memory

because I can't

how we are testing and that's very

simple and it's not the first time but

the first time when actually I can I can

do a video about this

so plug in the charger so the way to go

is to push every Ram chip yeah so

pushing let's see

try to push two just to show the

the video

so I'm keeping push the raw memory

and nothing really happened I mean no

picture on the screen

I mean yeah we reset the bias I mean we

unplugged the battery

but we should have picture right

or we should wait a little bit

no no picture no picture one amp

one a picture yeah good now let's try

the next two

plug in the charger again the next two

chips

pressing the power button

is taking one arm

let's see

and hello picture okay that's strange

that's weird

okay that's that's weird yeah because

already I checked and

I know the area but I don't know exactly

the chip

okay so we have no picture but he's

taking 1.06

maybe we should check the caps lock yeah

the cap lock is not working

okay let's let's try the first one yeah

I'm pretty sure this is the first one

so the first memory chip

pressing the power button here we press

the power button

check that picture

now I'm releasing

check the screen

is Frozen the system is Frozen it's

making lines and things like that

you can see now the system indeed is

frozen or whatever I press nothing it

will happen

so is the first memory memory chip from

here from this side this one

huh

it's pretty cool I mean that's how you

can test if you have a ram if you're not

yeah so first one

pushing the power button and the laptop

is coming on I'm just curious which side

of the chip it is

and it's working I think it's the bottom

the bottom side and you can see we have

picture on the screen now releasing the

finger

and the system is Frozen

okay that's how you can check

uh no now you can push back and nothing

will happen once all the system froze is

nothing what you can do

cool yeah that's how you can check

that's how you can check

obviously it's a crack solder behind you

push it will touch simple yeah

so let me just take out the fan quickly

let's Reflow that uh memory chip

now you can try something cool you can

take all out and just plug the memory

I'm pretty sure it will work I didn't

try but should work

okay let's have a look together

okay that's cool so how we are reflowing

a memory chip very simple just a little

bit of flux I prefer I prefer roasting

I prefer Rawson

I'll use Ross in this time

yeah that's all that's all you don't

need more yeah that's all that's all if

you use more it will get messy

now I need a nose probably a big one

yeah let me choose a bigger nozzle

perfect

Max temperature rubbing should be fine

you know

480 degrees fifty percent air should be

fine

now let's doing it so the idea is to do

it till the chip is moving yeah

that's the idea

when you see the chip moving

is done

yeah it's moving you can see it's moving

so it's done

that's the moment you stop and that's

the moment actually the job is done

now you have to cool out the boards

quickly

um

I have a thermal pad here so I can cool

the board quickly

this is a big board yeah the board is

flexing and

[Music]

uh it it will end up with crack solders

between the

the RAM memory

okay you should be fine yeah we can test

it right yeah

yeah perfectly

40 degrees perfect

so plug in the charger let's power on

the laptop

let's see power on

one funny spinning one is not present

because it took out the fan

now like

about one amp

cups look not yet

probably is loading the BIOS yeah

obviously we disconnect the battery so

it has to load the BIOS every time we

are plugging the power what happened

with my focus

1.0405 if you're happy here soon

hopefully

1.07

well actually we don't have picture

well that sucks you don't think

huh

we have no picture

is getting hot you see the current is

going up you know the hotter is getting

the the more current is taking you know

the the throttling thing yeah

okay so it's not working clear it's not

working

probably is the next ship but that's

fine don't worry that's fine that's fine

let's use some flux

same roasting flux

let's quickly Reflow the next one

so the next ship in line is this one

let's boil the Ross in a little bit

first

just evaporate the alcohol

from the rosin

yeah you can see now how it's bubbling

is very dense right now yeah

let's see

the second chip Reflow

yeah it's moving

we can see it is moving it's fine

it's fine

now let's cool down the chip

and it's still not working I can't

believe I can't believe

let's try to press the chip down still

doing it

I'm just curious

because R2 left yeah only two left

you think I remember it she's on the

other side of the board probably not

nah

[Music]

probably not

no it's not working if now if I'm if I'm

holding the chip down it's not working

wow

that kind of sucks

we broke it it was good

we have picture you remember

yeah that sucks yeah

really sucks okay let's Reflow the next

two

so we have the last two chips to Reflow

yeah let's do

Russian

good

let's boil the Russian a little bit

okay that one is moving

and this one is moving okay so now all

four chips has been reflowed yeah

we should be working fine

let me plug the fan because the the CPU

is really getting hot

let me plug this fan

if you ask yourself if you plug the

memory it will ignore the board memory

no yeah so even if you plug the rub

memory it will not work

so take your mind out just you know okay

I'll plug another round memory and it

will work no it doesn't work like that

okay let's plug the charger

we plug the charger

press the power button

we press the power button

hopefully it will work because otherwise

uh

uh yeah but should work yeah it's

working fine you can see

so instead of the first one I think was

the last one

yeah it's working fine and if I'm I'm

bending the board

bending the board yeah you can see I'm

bending the board nothing happened so

that's mean we are okay

yeah I can't press anything here right

now nothing

give me one second

and then put a screw here

proper hot

okay now let's test one more time

pressing the power button

okay all good yeah

so you can see the laptop is working

great fantastic

yeah I can

you see it's still moving

so we know the ram issue has been fixed

yeah

so that's how you fix a raw memory

problem that's how you test the idea is

to test because the fix I believe

everyone knows how to Reflow uh around

memory

so basically we found out actually this

one was pressing it was not working but

actually it was the first one

yeah

the weary flow

the the all four uh

RAM memory Chiefs okay that's how you do

it yeah just before spending time with

the buyers and after that oh still not

working okay I cannot fix it probably

it's at the CPU

I'm just saying I would say thank you

for watching like And subscribe if you

like the video like always yeah and see

on the next one bye