Hi everyone,
I've got this Samsung here that would be stuck in a boot loop.
After opening up and doing the tape block method, I was able to get it to turn on and play sound from the HDMI input, but with a blue screen.
Does that mean there is another combination of pins that I need to block in order to get a picture, or is there something more serious, faulty mainboard or faulty panel?
Thanks in advance
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Samsung TU8000, backlight and sound on, stuck in blue screen
-
Re: Fix broken tinsel wire on Speaker
thanks guys, i managed to fix it temporarily, but probably needs replacing tinsel wire soon.
-
Fix broken tinsel wire on Speaker
Hi everyone,
I've saved a pair of Philips AH 495 speakers from landfill and diagnosed the woofers are not working due to a loose or broken tinsel wire just on the joint of the cone (left wire on the picture)
What's the best and easiest way to fix this without damaging the cone ?
Can this be simple soldered on?...
-
Re: Panasonic TH-55AS670A no picture no sound
at this stage the best i can do IMO is to look for a spare mainboard
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
ok, there is no easy fix for a hobbyiest like me i guess.
i have to measure again but i think the multimeter showed something above 100V on two pins, 16V and 5V and 1V and 0.8V on the others...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
i've just measured the pins of IC5300, see image attached.
doesn't matter if TV is in standby or turned on, there is only 16V on one pin, the others are all 0V.
does that indicate a fauly IC ?
the other IC8705 has Voltages (from 0.8V to 120V) on almost every pin except one....
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
ok that's interesting, how would I do this, using a jumper wire ?...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
i was just wondering, should there be a clicking sound (for a relay ?) when you turn on the TV, because this one seems to be doing no clicking.
Just realised, because I had a look at a similar model of Panasonic the other day and there was a clicking sound once turned on.
That would indicate a problem with the power supply board, but in my case I measured most of the test points with valid voltages.
If I understand it correct, it could be something with the LED driver that is also on that same board?
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
is there any way to reflash via USB ?
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
just tried but did not change anything. still the same symptoms
i'm not getting the 13 blink code anymore, either way (with or with unplugged BL_SOS pin), it just shuts down after a few mins as it seems to be not getting any input and the red led is on solid (not blinking)...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
good idea, i was actually thinking of doing something like that just to see if the backlights would come up for example. in this case should they come up or is it to test the mainboard to see if it succeeds booting up?...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
Sorry I think I know what you meant by now.
I've measured the following voltages on the connector of the mainboard (A Board):
Pin 1: 15.7V (16V)
Pin 2: 15.7V (16V)
Pin 3: 15.7V (16V)
Pin 4: 0 (GND)
Pin 5: 0 (GND)
Pin 6: 0 (GND)
Pin 7: 5.2V (5VS)
Pin 8: 0 (BL_ECO)
Pin 9: 3.3V (SUB_ON)
Pin 10: 3.3V (KEY)
Pin 11: 0 (BL_ON)
Pin 12: 3.3V (POWER_ON)
Pin 13: 0 (PWMA)
Pin 14: 3.3V (BL_SOS)
Pin 15: 0 (PWMB)...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
ok i think this will be out of my capabilities i'm afraid.
if i understand that correct, the software is unable to boot because of this ?
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
There is also no voltage on the SRV-12V testpoint. The other two testpoints show 5.3V and 16V each.
I took out the board for you to see maybe any obvious faults....
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
Looks like the 13 blink code is not coming up today and it would just stay turned on (green LED solid) until it shuts down itself after a couple of mins.
There seems to be no voltage on the TCON board. No USB power, no TOSLINK red light.
What else can I try, I heard I could try to put the mainboard into the oven and bake it for 20 mins for a reflow. That would be my last attempt though
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
Thanks, I think I've tried that with no change. Will try again though just to be sure...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
ok, sounds like this is not repairable unless i replace the whole board?...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
not sure where to find this legend map? the toslink optical output is not lit red, so are the USB Ports also not providing any power (when connecting my google chromecast)...
Leave a comment:
-
Re: Panasonic TH-55AS670A no picture no sound
I should have mentioned that after a while (after solid GREEN LED) it goes back to standy and showing the red LED blinking code 13, which I have heard of it's related with the A or main Board.
Leave a comment:
-
Panasonic TH-55AS670A no picture no sound
Hi everyone,
I've got this Panasonic TV here with the following symptoms:
* Standby Light is solid RED
* Turning on using the Button on the TV (long press) would change LED to blinking GREEN
* After a couple of seconds, LED is solid GREEN and without picture or sound.
I've tried a couple of things before tearing it apart:
* Resetting using various combinations of powerbutton and volume buttons pressing down while booting.
* Activating Self Check according to service manual using IR Blaster (we have no remote unfortunately)...
No activity results to display
Show More
Leave a comment: