HP250 G3 Problem z obrazem.

Witam,

jak w temacie mam na stole HP 250 G3, sprzęt reaguje na włącznik, włącza się na 10 sekund z poborem 0,62A i brakiem obrazu, po tym czasie sprzęt się wyłącza ponownie. CPU robi się dość szybko ciepłe. Programowany bios bez zmian. Ktoś nakieruje gdzie szukać problemu?

LA-A992P rev: 2.0

PL102-3V
PLZ2-0V
PLH2-0,26V
PLM2-0V
PL302-5V
PL303-3,4V

Measure the resistance to ground of PLZ2, PLH2, PLM2.

PLZ2 - 315om
PLH2- 122om
PLM2- 111om

Measure the voltages on all pins of PUH1.
Measure the voltages on pins 2, 4, 7, 8, 9, 10, 11, 12, 13, 19, 20 of PUM1.
Measure the voltages on pins 2, 3, 4, 5, 6, 15, 16, 21, 22, 26, 27 of PUZ1

Płyta włączona

PUH1:
1-0
2-0
3-3,18
4-0,16
5-2,70
6-2,27
7-3,18
8-18,82

PUM1:
2-0
4-0
7-0
8-0
9-18,1
10-0
11-5,19
12-5,18
13-5,18
19-0
20-0

PUZ1:

2-0
3-0
4-0,07
5-0,03
6-0
15-0
16-18,8
21-0
22-0
26-0
27-0

Measure the voltages on pins 6, 9, 14, 84, 95, 100, 104, 106, 110, 112, 124 of KBC
Measure the voltages on pin 114 of the KBC in the following cases:
at power off
with pressed power on
to power on.

KBC:
6-0,07V
9-3,27V
14-0V
84-0,22V
95-0V
100-3,23V
104-3,28V
106-0V
110-0V
112-3,27V
124-1,74V

KBC 114 power of 3,25V pressed power on 0V, power on 3,25V

Measure the voltages on pins 5, 6, 20 of PU101.

PU101:

5-3,27V
6-2,56V
20-18,65V

Check the continuity between pin 110 of the KBC and pin 5 of pu101.
If continuity is present you have counted wrong the pin count.

KBC 110 -> PU101 5 brak połączenia

There is a diode between the two pins.
Measure the voltage across both pins of DK1.

DK1 od strony KBC 3,24 druga strona 3,26

Remeasure the voltage on pin 106 of the KBC
If 0v, try:
Replace the bios and remember to save the old one.
If 0v still remains, replace KBC.