Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
This is the right ribbon cable from the right screen board, but even trying to squeezing it, putting something behind there are more vertical lines at the same space of screen. Oups ! After seeing more precisely I think this is the black "plastic" bar of the ribbon at his center that may be problematic. However I don't think this is "€€€ rentable"...
Maybe if I found a ~tv with a ~same samsung panel ??
55WQL_Sl6V0.1 is one of the 2 panel board model, (in my...
Jojo337
Member
Last Activity: 05-04-2021, 11:33 AM
Joined: 10-17-2020
Location: Avignon
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Ok so I replaced the PSU and the TV works, however there is two lines in the screen, so maybe I broke IT or it was already there, I don't know !
Anyways the PSU was faulty !Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Hello all.
The new LEDS are in place.
Nothing seems to be "more broken"
after I dissasemble it.
However the backlight still doesn't works
Any others ideas, maybe it's the PSU ? The driver LED seems cold when touching.
With my phone flash I see that the BL is not at 0 in the settings
Thanks and have a good day !Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Here are the pictures of the led strips.
All 4 are defective now (the first led was "sticked" to a plastic reflector, maybe by heat...
I got a led tester. I put LED + to one of the + of the strips, and with the LED - I go to all - of the strips, each - illuminate 8 leds.
Just one led was already defective it seems, looks cracked. By disassembly it I certainly broke the first leds of each 4 because they were sticked to the reflector, IDK why, there isn't tape....Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
So I got some time today to dissasembly it...
It was a nightmare, but I got the 4 led strips. One led was down.
But during disassembly of each, the first led self destruct itself (sticked to one of the reflector layer). When testing the first led never light up (I suppose broken during disassembly) but every other do... except one lost in one strip, it sure be defective befor I didn't touched it.
I'm ordering all 4, I hope I didn't destroyed any other thing (I reassembled it without screws and it...Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Hi,
CXD9969AP IC6701
STBY : Pin 1 0.1v - Pin 8 13.8v
ON : Pin 1 0.1v - Pin 8 14vLeave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Impossible to find the sheet, maybe this is the same ?
[url]https://www.datasheetq.com/CXD9969P-doc-Sony[/url] (lack the A)Re: SONY KDL-55HX850 : No backlight,...] (lack the A)Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Impossible to find the sheet, maybe this is the same ?
[url]https://www.datasheetq.com/CXD9969P-doc-Sony[/url]Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
I already do it for a samsung 40d5003 (in fact I'm waiting the new leds to come...) but here it's a 55, glass panel in front (strange design even if "beautiful").
SMPS IC : IC6701 ?Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
I retested CN6601 not plugged, meter in place, first turn on, in fact all pins of CN6601 except NC and LD_ERR are -0.01v in stby and goes "down" to -0.02v when turning on.
No flash at all from leds even a micro flash (verified in dark room).Last edited by Jojo337; 10-31-2020, 02:34 PM.Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
I was hopping that the leds be all good but my hope is going down
Anyway here are the results, if my tests are correct :
Diodes (multimeter to diode mode) D6602, 03, 12, 13:
1.140v 0.425
1.140v 0.425
1.140v 0.425
1.145v 0.423
If I disconnect CN6601 everything is at 0v except 0.7V pin 11 LD_ERR
(startup or not) The TV works fine behind except of course BL
R6707 2.2ohm
Stby C6530 395v, 13.88v with postive...Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Hi !
F2001 : Continuity OK (beeping), 0.001v, 0 ohm
1) LED_ON is ~-0v in standby and 3.28v TV on
2) VLED_VCC are 0v in standby, go up to 0.140v EACH 4 VLED_VCC for 2 secs and go down to 0V 3 sec later progessively.
Thanks again !...Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Hi and thanks you for your help !
To be clear, when all cables are connected, BL_ON (CN6401 to main borad) is never 3.3v, even if LED_ON (CN 6601 to driver LED) is ~3.28v.
R6547 : Beeping with tester (continuity), 0.001v, 018.5 ohm in multimeter (18,5 ohm so ?), it's written 0.1 ohm on it, is it broken or my test is wrong ??
Service manual too big for attachment :...Last edited by Jojo337; 10-29-2020, 06:49 AM.Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Still nothing with the 3 resistors (STBY3.3, POWER ON, BL_ON and PWM_DIMMER), same reactions (pins are 3.3v)Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
There was a mistake in my post #8, it's the pin 5 and not the pin 3.
Anyways, pins 28 to 5 with resistor and 5 to 23 with resistor does the same !Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Yes, nothin plugged except the "Driver led" cable and the modifications.
So after the #7 post test, nothing happens. I heard the "clac" from the PSU, but no backlight.
BL_ON is at 3.3v with resistors but no backlight.
After the tests, unsoldering the resistors, the tv is like before (turns on, screen and sound OK but no BL).
[url]https://img.super-h.fr/images/c4345e56116600d304dfda39bd8905c8.jpg[/url]
(Ok this looks bad, but the picture is after...Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
I inserted the resistor into pin 23 (in addition with original "pin 23, or connector" from cable, detached the connector "pin 3" from the cable and inserted the second pin of the resistor into pin 3 of the PSU. I got 3.3v in the resistor "pin".
I will try this tomorrow, thanks
Last edited by Jojo337; 10-27-2020, 01:09 PM.Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Hi ! So the backlight with the resistor between pin 5 (PSU) and with standby 3.3 doesn't turn on Do you have other ideas ?
Thanks !Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
Ok I just ordered some resistors 1kohm 0.25w I will come back when the test will be done ! Thanks...Leave a comment:
-
Re: SONY KDL-55HX850 : No backlight, no error code, rest OK
I tested this pin and no, always 0V.
I tried to do a shunt with POWER_ON and STBY_3.3V but nothing happens with the TV too !Leave a comment:
-
SONY KDL-55HX850 : No backlight, no error code, rest OK
Hi all !
I got a Sony 55HX850 with psu APS-326(ch) and Driver LED ST550RD-S01.
I don't know what happenned before I get it.
The TV is working great, except the led backlight that does'nt. Backlight nevers turn on, not even a little flash.
The TV doesn't show red light errors at start
The tv is working, I heard the sound of TV from antenna, menu etc... with the flash of my phone I can see the picture that seems fine (T-con OK ?).
Fuses from Driver LED ST550RD-S01 seems fine (multimeter beeping : not broken, 0V), and caps of...
No activity results to display
Leave a comment: