I am presently repairing a Sony kV32s26 with no screen light.I have replaced Q601,Q602 and R607 in the PS and also the HOT.There in no heater voltage and therefore this can be the reason for the lack of screen light.Can anyone offer help with this problem?
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Re: Sony Kv32S26 with no screen light.
Do you have any voltages from the highvoltage transformer? I would check and resolder the pins on the horz. drive transformer, that is usualy the cause of the output shorting and taking out the power supply.
Do you have B+ to the horz. output transistor?
Do you have Horz. drive signal?
You could possibly have a bad High voltage transformer, but usually if its bad it will short the horz. output transistor again.Last edited by R_J; 12-23-2013, 01:31 PM. -
Re: Sony Kv32S26 with no screen light.
I have checked the flyback trans,soldered the horz drive trans.There is HV at
the 2nd anode at the back of the picture tube.The voltage on the heater pin
on the crt board is missing and therefore screen light is missing.The standby
light is blinking continuously.Comment
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Re: Sony Kv32S26 with no screen light.
Sony : Kv32s26 : No raster, hv normal, replace c366 10000pf
also look @ vertical IC and go ahead and resolder those pinsLast edited by RON_CET; 12-23-2013, 05:51 PM.Ron Driver,BSEE,CET,ISCET,NESDAComment
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Re: Sony Kv32S26 with no screen light.
The heater voltage comes directly from the flyback pin 6 to cn503 pin 1 (that voltage is ac at the horz. freq.) it then goes to the crt board and through a resistor 2.5 ohm to pin 8 of the crt.
Do you have -15v on tp99 and +12v on tp98 ? they are supplies for the vert. ic. if not check r536 & r537 (.47ohm) if open the vert ic could be bad.
No vert. deflection you will have no video.Comment
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Hi guys
strange one
I have a dead Sony 55X850D
when plug in, black screen, no front white or red LED, no back light no screen
Voltages I get
3.3v LD/power and main board
reg 12V
reg 19V
3.3v on power on pin
no Tcon on
no tcon 12v
no BL_on
I do get BL_ERR 2.0v
I tried to bypass it by ground it but still get same symptom
I did also found a possible shorted cap on main board as it is showing 10 ohms when measure with meter
or is possible the chip next to... -
Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!
My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.
This time the original cable broke too close to the screen, it can't be fixed without tearing the screen... -
Hi all , thanks for having me & I think this has been asked before but my case seems a bit odd.
I have a MacBook Pro , board 820-2915a and it turns on , chimes etc etc , keyboard lights up, fans spins , can turn caps lock on/off but screen is dead.
Iv tried the resets , shine torch through back logo , nothing , it seems the screen has no power. If I plug charger , it charges but if I disconnect battery it displays green light but won't turn on. Iv tried screen on with another board & it works & seems I'm not getting any voltage at pin 2 , next to ground pin .
is this... -
Hello,
Stopped by this site trying to fix my parents Panasonic Plasma TV.
Model number is TH-50PZ85U
Power comes on and the red power light stays on solid.
Did a few checks like hold the power button on for 60 seconds, hold the - Volume while holding the menu button, no luck, still@ blank grey screen as the screen lights up very vague.
I also hear a few clicks.
I also think my parents said there was a thunderstorm and the TV failed after that.
Section 6 in the service manual talks about power and no screen,...10-30-2024, 10:09 AM -
Just had a customer bring in a M2 MBA A2681 that had had a screen replacement in April at another repairer. Since then, she has been getting intermittent kernel panics. It's an aftermarket screen, and of course it fails in diagnostics as the calibration hasn't been done. The error in the panic log is "No device added after powering on the rails".
It seems the original repairer has swapped the board and the screen to other MAC's, and said that it isn't a screen issue. From what I understand, by doing a quick search on Google, this is in fact a screen issue. The panic relates...07-31-2025, 08:37 PM
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