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SONY BG2T CHASSIS KV-TG21L70 M80 P52
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3.1 MB
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53
53
Category
TV
SERVICE MANUAL
TV
SERVICE MANUAL
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SONY BG-2T CHASSIS BG2T KVTG21L70 M80 P52 BG KVTG 21 70 80 52 KV TG21L70 KV-TG21L70
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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.
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.
Sziasztok!
A véleményeteket szeretném kérni hogy érdemes-e evvel a tv-vel foglalkozni.Ha kilező hibás akkor gondolom nem.
Köszönöm!
SZétszedtem ,kitakarítottam.Vizuálisan nem láttam hibát.Bekapcsolás után ugyan úgy függőleges csíkok a kijelzőn.Kicsit olvasgattam hogy miért csíkozodik a kijelző.
Találtam egy olyan hozzászólást hogy ha kikapcsoljuk a kép beállításoknál a "DRC" funkciót akkor megszüntek a csíkok.Kipróbáltam és láss csodát a kép tiszta lett semmi rendellenesség.
Járattam legalább 5 órán át.Semmi hiba.Ha vissza kapcsoltam a DRC módot egyből vissza jött a hiba de még csúnyább lett a kép.Így hogy ki van kapcsolva a DRC mindem OK.Mi lehet
hogy nem bírja ezt a beállítást?Találkozott már vki ilyennel?
A véleményeteket szeretném kérni hogy érdemes-e evvel a tv-vel foglalkozni.Ha kilező hibás akkor gondolom nem.
Köszönöm!
SZétszedtem ,kitakarítottam.Vizuálisan nem láttam hibát.Bekapcsolás után ugyan úgy függőleges csíkok a kijelzőn.Kicsit olvasgattam hogy miért csíkozodik a kijelző.
Találtam egy olyan hozzászólást hogy ha kikapcsoljuk a kép beállításoknál a "DRC" funkciót akkor megszüntek a csíkok.Kipróbáltam és láss csodát a kép tiszta lett semmi rendellenesség.
Járattam legalább 5 órán át.Semmi hiba.Ha vissza kapcsoltam a DRC módot egyből vissza jött a hiba de még csúnyább lett a kép.Így hogy ki van kapcsolva a DRC mindem OK.Mi lehet
hogy nem bírja ezt a beállítást?Találkozott már vki ilyennel?
Sziasztok!
Restellem,de nem tudom a 11-es hiba kód mit jelent.A kód tábla azt mondja:" M3L RXD Low Pover up only".Legyetek szívesek segíteni,mit jelent.Még azt is kérdezném,hogy ezek a kódok sasszi szerint változnak,mert van ahol a 8 voltos táp hibáját jelzi.Elöre is köszönöm a válaszotokat,üdvözlettel Reparator1
Üdvözlök Mindenkit!
A címben említett Sony xf 9005-ös működő, de kissé sérült lcd panel miatt a panel cserére szorul.
A barátom nem szeretné kidobni. Van köztetek aki vállalná a cserét, javítását ?
Köszönöm a válaszokat.
Laci
A címben említett Sony xf 9005-ös működő, de kissé sérült lcd panel miatt a panel cserére szorul.
A barátom nem szeretné kidobni. Van köztetek aki vállalná a cserét, javítását ?
Köszönöm a válaszokat.
Laci
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