I need help error Dell 3493 no video

[skyline_bogota]

I have had problems with a Dell that turns on but does not give video, I ran the Bios thinking it was going to be solved but no, it has all the voltages 5 Alws and 3 Alws, but I was checking the schematic and in pum01 I have no signal on the pin #7 (S3) which is the DDR_VTT_ON signal of 0.6v, can anyone help me?

[mcplslg123]

En on pin8 is present. If EN on pin7 is missing,check the resistance to GND on pin7. S3 will come from PCH.may be your mb is stuck in S5 stage or may be even S4 stage of 1.2V is present on ram coil.

[skyline_bogota]

En on pin8 is present. If EN on pin7 is missing,check the resistance to GND on pin7. S3 will come from PCH.may be your mb is stuck in S5 stage or may be even S4 stage of 1.2V is present on ram coil.

the voltage of the coil that goes to the memories if present is 1.2v, on pin 7 there is only one resistor, but it is not present on the board

[mcplslg123]

1.2V on ram coil means you're atleast in S4 stage.
You didnt share resistance to GND on pin7.
Check resistor on TON pin.

[skyline_bogota]

1.2V on ram coil means you're atleast in S4 stage.
You didnt share resistance to GND on pin7.
Check resistor on TON pin.

on pin 9 the resistance is 502 ohms (photo)
pin 7 without resistors

[mcplslg123]

Take that resistor connected to TON pin out and then measure resistance across this resistor. Should be very high like 500k. I didnt ask for diode mode readings on TON pin.
What is the voltage on both pins of the resistor connected to pin TON?
Where is the problem in measuring resistance to GND on pin7 of this ram IC?

[skyline_bogota]

Take that resistor connected to TON pin out and then measure resistance across this resistor. Should be very high like 500k. I didnt ask for diode mode readings on TON pin.
What is the voltage on both pins of the resistor connected to pin TON?
Where is the problem in measuring resistance to GND on pin7 of this ram IC?

I measured the resistance on the outside and it marks the same as the photo published previously (502) , I put it back and with a voltage at the source of 19v 3a, before the resistance 19.03v and then 18.90v on pin 9 of TON. in the resistors of pin 7 it does not mark anything.

[rogfanther]

SKYLINE_bogota, he wants you to measure resistance between pin 7 and GND, without power connected. He is not asking for the resistors soldered in the board.

[skyline_bogota]

Take that resistor connected to TON pin out and then measure resistance across this resistor. Should be very high like 500k. I didnt ask for diode mode readings on TON pin.
What is the voltage on both pins of the resistor connected to pin TON?
Where is the problem in measuring resistance to GND on pin7 of this ram IC?

This is what marks between pin 7 and GND

[mcplslg123]

Either you're not able to understand me or i'm getting confused. As per post#5, your meter scale is 2000 ohms and measurements shows TON resistor is measuring 500 ohms. Is that correct?

Best way is to de-solder resistor on TON line, set meter to M ohms scale and then measure resistance between the two ends of this resistor. Should read 500K approx.

[skyline_bogota]

Either you're not able to understand me or i'm getting confused. As per post#5, your meter scale is 2000 ohms and measurements shows TON resistor is measuring 500 ohms. Is that correct?

Best way is to de-solder resistor on TON line, set meter to M ohms scale and then measure resistance between the two ends of this resistor. Should read 500K approx.

The unsoldered resistor measures 502 ohms and the soldered resistor measures the same 502 ohms. I'm looking for a 500k resistor to replace it, because I think the value is not correct.

[mcplslg123]

Anything close to 450K will do. A slight deviation is fine. The voltage on one end of this TON resistor should be 19V and the other end connected to the IC should be approx 1V.