(347) 552-2258 [email protected]

[SOLVED]820-2936 no display

aurel476

aurel476

New member
another board with liquid spilled,
restored power and charge and cleaning ultrasonic (flux present on picture)
not display on external screen and internal, tried another lcd and lcd cable, no activity from external
i have only light from hdd hard drive only no activity
I do not know or test cpu vcore


PPBUS_G3H 12.56V

PPBUS_S5_HS_OTHER_ISNS 12.56V

PPDCIN_G3H 16.5V

PP3V42_G3H 3.49V

PPVRTC_G3H 3.31V

PP5V_S5 5V

PP5V_S3 5V

PP3V3_S0 3.3V

PPVCORE_S0_CPU 0V

P5V_S0_CPUIMVP_VDD 5V
 

Attachments

  • photo1125.jpg
    photo1125.jpg
    2.3 MB · Views: 0
aurel476

aurel476

New member
r7402 bad replaced now activity on harddrive, no backlight no display no backlight

replaced fuse F9700 bad, i have pin 1, 2 12.56V

PPBUS_SW_LCDBKLT_PWR 0V may be bad Q9706 or Q9707 ?

R9789 146.8K R9788 302K

Q9706 pin 4 and 3 12,56V and pin 1265 0.4V probably bad ?
 
J

jadao

Member
Vcore was missing, you replaced bad R7402, can you confirm if vcore is back now?

Let assume you have vcore since you mentionned having hdd activity:
What caused F9700 to go bad? There was a short on this line, or just the fuse was looking bad?

If the gate pin 3 of Q9706 is not lower than pin 4, Q9706 will not grant access to 12,56v from pin 4 to pin 1,2,5 and 6.

Pin 4 may not be lower than pin 3 for several reasons.
 
D

dukefawks

Administrator
Is there chime? LCD not recognized, first need image then can fix backlight if needed. Check with known good LCD, inspect connector/cable. Check 3V to L9008.
 
aurel476

aurel476

New member
No Title

jadao, ppvcore_s0 0,55V on pin 1 of R7402 f9700 broken by corrosion

duke i have not other lcd and cable for test i will order

L9008 3,3V i have this speaker but no bass speaker shime with him ?

cable and connector looks good

Tried with connector jack to external speaker no shime
 

Attachments

  • photo1126.jpg
    photo1126.jpg
    81.4 KB · Views: 0
aurel476

aurel476

New member
:( okay i have good lvds cable now i have backlight and startup chime but no video for video it's lvds_ig_a_data ?

pin 1 at 30

3,25V
3,25V
3,29V
0,007V
3,29V
3,29V
1,15V
1,25V
0V
1,15V
1,25V
0V
1,14V
1,26V
0V
1,01V
1,01V
0V
0V
27V
27V
0V
0,8V
0,8V
0,73V
0,71V
0,92V
0,84V
0V

need 50v for backlight switching but i see backlight, lp8550 problem ?
 
Last edited:
J

jadao

Member
Pin 4 should be 3v3. You have 0.007.
Check if L9008 is not open. Maybe the a1342 lvds cable shorted this pin...
Check also any burnt trace or burned pins on/around lvds connector.
 
D

dukefawks

Administrator
Do you have a white screen with backlight or a dark screen with backlight? Check all LVDS lines on diode mode, LCD not connected of course.
 
aurel476

aurel476

New member
replaced L9080 same problem

diode mode lvds connector lcd not connected

pin 1 at 30

0.001
1.226
1.225
0.654
OL
1.236
1.232
0.946
0.943
0.001
0.898
0.944
0.001
0.939
0.885
0.001
OL
0.885
0.001
OL
OL
OL
OL
OL
OL
OL
OL
OL
OL
OL
 
aurel476

aurel476

New member
and voltage recheck with lcd connected power on

pin 1 at 30

0
3.24
3.24
3.29
0.006
3.29
3.29
1.15
1.25
0
1.15
1.25
0
1.14
1.26
0
1.15
1.15
0
5.12
27
27
5.6
0.8
0.8
0.7
0.7
0.9
0.9
0.1
 
aurel476

aurel476

New member
Solved i replaced C9020 and C9796
another question for displayport (i know you don't like this)
Any minimum point to check?
 
D

dukefawks

Administrator
Both those caps have nothing to do with image on the LCD. Heck they won't even affect the backlight.
Fuck display port.
 
You must log in or register to reply here.
Top