Dell Inspiron 3521 brak obrazu

Trafił do mnie Dell bez obrazu na matrycy jak i na wyjściu HDMI. Przeładowałem oba wsady pamięci FLASH (2 i 4 MB) ale nic to nie dało. Niepokoi mnie brak wielu napięć na dławikach. Układ graficzny także przegrzałem.
Poniżej napięcia z układu PU800 ADP 3211A:
1 0.06
2 0.66
3 0.66
4 0
5 0
6 0
7 2.95
8 0
9 0
10 0
11 0
12 18.86
13 0
14 0
15 0
16 0
17 0
18 0
19 0
20 2.95
21 0
22 0
23 2.55
24 2.95
25 0
26 3.377
27 3.377
28 0
29 3.377
30 0
31 0
32 3.177

Napięcia na dławikach (w nawiasach rezystancje do masy):
PL1100 1,51V
PL800 0V (9 omów)
PL900 11,59V (ładowanie baterii)
PL803 0,95V
PL600 0,85V
PL701 0V (11 omów)
PL700 0V (10 omów)
PL300 1,5V
PL500 1,08V
PL200 3,3V
PL201 5,1V

I jeszcze na kondensatorach:
PC1293 1,08V
CC167 1,51V
CC172 0,85V
CD14 1,51V
CC176 1,78V

Czy mogę prosić o jakąś radę jak rozgryźć co mu dolega ?

Model płyty płyty:
VAW01 LA-9101P Rev:1.0(A00)

Measure the resistance to ground on pin 20 of PU800.
Measure the voltages on all pins of QZ1.

Resistance to ground on pin 20 is about 4 MOhm.

QZ1 before press power button:
D 5,12V
S 0V
G 0V

QZ1 after press power button:
D 5,12V
S 2,95V
G 5,19V

No cóż masz ewidentnie zaniżone +5VS. QZ1 mieści się na dole płyty, pod oznaczeniami LA-9101P. Tranzystor przełączający +5VALW to +5VS SI4128DY-T1-GE3_SO8.

Possible problems:
-QZ1 failure
-RZ4 fails
-Voltage The drain of missing PQ902.

Measure the voltages on pins 23, 24 of PU200.
Measure the voltages on all pins of PQ902, PQ903.
Measure the resistance to ground on pin 1 of QZ1.

PU200:
23 5,07V
24 5,12V

Before press power button:

PQ902
D 19,88V
S 19,88V
G 3,58V

PQ903
D 0V
S 0V
G 5,07V

After press power button:

PQ902
D 19,84V
S 19,84V
G 3,57V

PQ903
D 0V
S 0V
G 5,07V

Measure the voltages on pins 9, 125, 6, 14, 27, 65, 95, 100, 105, 110, 112, 114, 116 of UE1 (KBC).

Before press power button:
9 3,38
125 3,38
6 0
14 0
27 0
65 0
95 0
100 0
105 0
110 3,1
112 3,37
114 very sensitive when I touch the board: from 1,4 to 2V
116 0

After press power button:
9 3,36
125 3,36
6 3,37
14 3,37
27 0
65 0,03
95 3,35
100 3,32
105 0
110 3,14
112 3,38
114 2,06
116 3,35

Measure the voltages on pins 2, 3, 5, 6, 8, 15, 16, 21, 22, 26, 27 of PU700.

Before press power button:
2 0
3 0
5 0
6 0
8 0
15 0
16 0
21 0
22 0
26 0
27 1,7


After press power button:
2 3,35
3 0,85
5 0,97
6 0,13
8 3
15 0
16 2,69
21 3
22 3
26 2,71
27 0

Machine napisał(a):Possible problems:
-QZ1 failure
-RZ4 fails

Measure the resistance to ground on pin 1 of QZ1.

Check QZ1.
Check RZ4.
Measure the resistance to ground on pin 1 of QZ1.
Measure the voltages on all pins of RZ4.
Measure the voltages on all pins of QZ1.

QZ1 seems to be ok.
The resistance to ground on pin 1 of QZ1 is over 1 MOhm.
I can't find RZ4 - what is this and where is it on the board ?

Check:

Resistance of RZ4 is 55,4 kOhm
Before power up tere are:
2 pin 0V
1 pin 19,68V

After power up there are:
2 pin 5,21V
1 pin 19,63V

Also check the tension of QZ2 as previously attached drawing.
Check QZ2.
Check CZ9.
Check RZ6.

Before power up:

QZ2A:
D 0
S 0
G 5,06

QZ2B:
D 0
S 0
G 5,06

CZ9 0

RZ6 there is no this resistor on the board.

After power up:

QZ2A:
D 2,95
S 0
G 0

QZ2B:
D 5,2
S 0
G 0

CZ9 5,2

Measure the voltages on all pins of QZ8.

Before power up:

QZ8
D 5,06
S 0
G 0

QZ9
D 0
S 0
G 5,06

After power up:

QZ8
D 0
S 0
G 3,35

QZ9
D 19,53
S 0
G 0

Replace QZ1.

After replacing QZ1 laptop began to fully work - 100%
This transistor did not openned fully afer setting up the gate.
Thanks a lot for help.