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SONY KV-PG21M70 PG21P40 PG21P40 PG21P70 SM

TV - SERVICE MANUAL
Type: (PDF)
Size
6.5 MB
Page
51
Category
TV
SERVICE MANUAL
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Relevant TV forum topics:
-SOLVED- SONY KDL-32EX600 red led 2 flashing - negative 120V backlight missing PSU GE3D APS-272
Hello
I have on my table this sony kdl32ex600 with backlight issue. It's a common failure of this psu but i do not find any part faulted on this board.
The schematic it is almost the same, with minor differences with GE3B found at page 56 on this service manual:
https://elektrotanya.com/sony_kdl-32ex600_kdl-40ex600_kdl46ex600_chassis_az1-k.pdf/download.html
Uploaded only the page 56 from this sm to easing the search.
The red led it's flashing 2 times, meaning psu faulty. Indeed the led backlight does not light.
With the PSU outside of the tv, just with one resistance of 180ohm between standby ( pin 1 3,3V on connector CN6150 ) i get this values
on in:
starting with pin 1

1  +3,3V ST-BY
2  +3,3V AC_OFF_DET
3  +3,3V POWER_ON (with resistance 180ohm between pin1 and pin 3)
4  +12,56V AUDIO_12V
5  0V AUDIO_12V_GND
6  0V REG_12V_GND
7  0V REG_12V_GND
8  +12,6V REG_12V
9  +12,6V REG_12V
10  +0,1V BL_ERR
11  +3,3V BL_ON
12  0V DIMMER
13  0V DIMMER_DC
14  0V T-CON_Vcc_12V
15  0V T-CON_ON
All measure done at secondary ground point C6800 GND as reference.
Meanwhile, the led connected to CN6800 will remain with no light at all. The CN6800 will deliver positive 91V.
The negative branch will deliver at CN6801 ( both pin1 & 2 ) just -1V.
In the training manual found always in here at
https://elektrotanya.com/sony_kdl-32ex600_40ex600_46ex600_chassis_az1k_training%20manual.pdf/download.html
at page 56 will say "SHORT" at pin 12 DIMMER for testing the PSU, always with pin 3 POWER_ON connected to 3,3V ST-BY - pin1.
If i'll put a 180ohm resistance between GND and pin 12 DIMMER, then the tension on CN6800 will rise to +179V and the negative from the CN6801 will rise to -5V, the backlight led will light very very weak.
All tension from CN6805 will remain the same, except the BL_ERR will rise from +0,1V to +1,1V.
With only power_on pin 3 shorted by 180ohm resistance to the pin 1, i get this weak oscillation at emiter of Q6816 + Q6817

[URL=https://picturepush.com/public/16067400][IMG]https://www1.picturepush.com/photo/a/16067400/640/diverse/Q6816Q6817.jpg[/IMG][/URL]

With pin 12 DIMMER shorted ( always by a 180ohm resistance ) at GND, the oscillation will change from 250khz 1,6vpp to almost 70khz at 0,81Vpp. as below:

[URL=https://picturepush.com/public/16067401][IMG]https://www1.picturepush.com/photo/a/16067401/640/diverse/20181117-175255.jpg[/IMG][/URL]

Already checked the capacitors C6828 / C6830 together with D6805 / D6806.
Also checked the L6800 ( trafo ) and i've get 5,5mH instead of 5mH, i think it's ok.
All fuse checked, ok.
Q6814 and Q6801 tested under mosfet tester, ok.

[url=https://picturepush.com/public/16067402][img=https://www1.picturepush.com/photo/a/16067402/220/16067402.jpg][/url]

IC6800 & IC6801 gave +9V and respectively +2,49V

Already checked various components all over the board, i am out of ideas.

Any idea or help would be apreciated.
 
SONY KD55X9305C tuner gond
Sziasztok! Ismét egy érdekes hibához kérném segítségeteket. A készülékkel DVB C  kábeltévés adást vesznek ,és a probléma a következő. Bekapcsolásnál  sok esetben,főleg ha hosszu ideig ki volt kapcsolva a készülék,akkor kiírja hogy nincs jel.Hiába váltanak másik csatornára ,ott  sincs,holott a kábelhálózat jó.Ha a menüben az "ujrainditás" opciot alkalmazzák akkor bejön a kép és tökéletes,nem pixeles stb.Utána  ha ki be kapcsolják továbbra is jó,de másnap már nem biztos,ilyenkor megint ujra kell inditani a softvert.Ami érdekes ,ezt azota csinálja ,miota lefrissitette magát a netről a tv ,mert azelőtt jó volt.USB-ről próbáltam rátenni a legujabb softvert de azt írja ,hogy naprakész a tv. Gyári beállítás ,ujrahangolást próbáltam.
Tud esetleg valaki valami tippet erre,mert én kifogytam az ötletekből.

Köszi

Lalee
SONY KDL-37P3000 lcd tv időzitő
Sziasztok. Tud e valaki segíteni, SONY KDL-37P3000 lcd tv bekapcsolási időzítőjét, ma beállítom, hogy mindennap 06-h kor bekapcsoljon, holnap bekapcsol 06-h kor, de holnapután és a következő napokban mindig 1-h vall, később kapcsol be. Mi lehet vele, szoftver vagy valami rejtet beállítási hiba. A készülék másfél éves, első naptól fen áll a jelenség, de mostantól lenne rá szükségem, hogy mindennap és pontosan bekapcsoljon. Ha találkozott valaki ilyen hibával, vagy tudja az okát, várnám válaszát. Köszönettel: Laci
Sony KDL52VL150 CCFL LCD - lines in picture
Screenshots of problem here in the post.

Picture of screen with both cables to panel from TCON connected, and the other is with one side disconnected.

I have read the cables from the TCON to the display loosen up on the end to the panel. I believe as I am working on moving the cables around, the picture is improving 
and getting clearer. So I think thats the problem. Someone mentioned using tape over them to hold them to the panel better. I have not taken the metal frame off to 
look at them, but there is a narrow gap where I read some people stuff cardboard in there to press down on them better.

Has anyone ever seen this issue and come up with a good way to resecure the cables?
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