Toshiba 40LV685D TV - No Backlight, Replaced STR-A6069, SEM2107, AO4614, Inverter SSI-400-14A01

Question

TV as in the subject, initial symptom - does not turn on. Replaced STR-A6069 chip. There is no backlight after switching on the power supply. After replacing the SEM2107 chip and AO4614 transistors. Inverter SSI-400-14A01 TV turns on for a moment, 24 V voltage is applied to the Inverter but the...

lisek · Answer

Including service kit for this model inv. for (e.g. LTA400HA07) enter

tomsoft · Answer

After all, I wrote that I replaced SEM2107 and all transistors.
After replacing the Inverter, it does not block the motherboard because the Main board has not leaked before. But the TV keeps resetting.

Added after 44 [seconds]:

Fluorescent lamps are also checked OK

mirex · Answer

Here comes what is supposed to cause them to catch fire? And the SEM2107 has power though?

lisek · Answer

Protect off behind Link In the appendix you have a better schematic with SEM2106

tomsoft · Answer

OK, I'm at home now, I can catch TV on Mon
I think the topic is interesting. Mirex has already checked everything
And what and how I will write on Monday, because to d ... I write with
phone !!
Thanks "Lisek"

tomsoft · Answer

Inverter voltage 24V OK. The power supply on SEM2107 equals 17V and it is still at this level even though the TV resets. Bypassing the Protect on the SEM does nothing. So what ....?

lisek · Answer

The method of removing the Protect lock in these ICs must be adapted to the given system, pay attention> they have different numbers of pins ...
I showed for SEM2106

For SEM2107 it is SSOP-28 pin housing.!
View and take measurements on pin "ah, give it up."
It is important, for example, on a pin. (Vref)

There is also an output system. on the 4th trafo. with 14 ohm field transistors
* described on the "Chinese website" Link

* min. behind Link_ _32. $ + Porto
Field AO4614

__________________-

For example, they say that

Below is the job center for SEM2106 SSOP24

I don't know what Main is, but the series
Toshiba 40LV655xx LCD TV
Main Board - PE0772 (V28A001020A1)
** CPU_scaler - MST 6B885GL-LF-3
T-Con SYNC60C4LV0.3
PSU DPS - 276AP A
behind Link_ the minimum voltage values were given on T-con

Quote:

In the service menu> point: Model (for my model TV ie 40LV655P) set the value 02H and after that make initilization memory.
Click the return button (i +) and holding it press the PROGRAM button +.
After the initialization of the TV, turned on the auto channel search. .... (as if the brightness and contrast low). These after the initialization data is not preserved the LCD panel.
Put a new ?24?64. Made again as mentioned above and TV ork fine.

tomsoft · Answer

SEM2107 is equivalent to SEM2106 and has 24 pins !! so the stated voltages are measured on the correct pins.

tomsoft · Answer

??? Lisek I know what it looks like since I replaced it and as you can see it has 24 pins. It would be more important if the 17V is OK. I do not have a service center or a diagram and that would be helpful. In addition, in this model, Inerter cooperates with T-CON which gives INV_On and nothing changes there. There is no TPS65167 converter on T-CON, maybe there is a problem here, the only question is why the fluorescent lamps will not collapse even for a second despite the protect photo. How do I force an entire Inverter to start? Added after 2 [minutes]: Do you think this is an EEPROM problem? Where did the charge come from (I'm not registered on this page)

lisek · Answer

Two ver. work of this circuit

With LEDs for protection

1. voltage on pin you have approx
2. role of pin.15 UVLO, what voltage value and compare with datasheet
3.Vcc usually is 12V, (Tip # 14: VCC: 12.36V) / * (your value + 17V maybe too much)
see what will happen when you connect the R-150k between pin.14-pin.15
what then with the voltage on pin.15 (increases)

___________________
Voltage on PFC 390V
CN801 Pin # Label: measured voltage
1 High (FET):
3 Low (FET):
8 GND:
9 OVP: (? V) (Seems to be a backlight-confirm Signal.)
10 CNT_PRT: (? V)
11 VCC: 12.38V (13V)
12 LD: (? 12V)

CN802 Pin # Label: measured voltage
1, 3, 5, 7 B13V: 12.38V (13V)
2 P_DIM: 1.43V? (or 3.5V?)
6 BLU_ON: 5.07V
8, 9, 10 GND: 0V (0V)
11, 13 B5V: 5.2V (5.3V)
12 A5V: 5.2V (5.3V)

tomsoft · Answer

I will give the tensions when I measure it because I fight 3 TVs at once. But I wonder what is the problem of the backlight for the cyclic TV reset?

mirex · Answer

And I asked before the fox fairy tale started. Change that and see if it works, don't look for a hole in the whole thing.

tomsoft · Answer

Delta DSP26AP power supply
Tensions:
PJ91
1Power_Protect + 3.5V
2Power_Sig + 3.1vV (only 1.9V temporarily)
3AC_Detect + 3.3V (3.1V)
4Power_LCD + 3.1V (0V)
5.6SGND 0v
7.8 LCD + 12.08V (0V)

PJ90
1,2Sound_Gnd 0V
3.4Sound + 18.0V
5 + 24.3V
6,8,12,14Sgnd 0V
7Power_TV + 3.0V (0V)
9.10.11 + 12.2V
13 + 5.2V

P861
1,2,3,4Vini + 24.3V
6,7,8,9,10 Sgnd 0V

Values currently measured in parentheses.
Maybe some kind of power supply diagram?

Added after 1 [minutes]:

DSP-276AP sorry for the mistake

Added after 23 [minutes]:

I have a question - can DAP015D be changed to L6599. This DAP is in this TV power supply.

lisek · Answer

Link_ DAP015D (16pin) to L6599D kontroler PCF PSU DPS-276AP IC31 NCP1607B + polowy 15N60C DAP015D +2x K10A60D zasilacz: 12V/24V stby A6069H

tomsoft · Answer

I replaced DAP015D with L6599 and ... nothing - the same, the same voltages (i.e. no described). I have enough of it for today - let it bloom until Wednesday.

lisek · Answer

From the link I provided earlier, you have the tension from a good TV
PJ91
1Power_Protect + 3.5V
2Power_Sig + 3.1vV
3AC_Detect + 3.3V
4Power_LCD + 3.1V
5.6SGND 0V
7.8 LCD + 12.08V

PJ90
1,2Sound_Gnd 0V
3.4Sound + 18.0V
5 + 24.3V
6,8,12,14Sgnd 0V
7Power_TV + 3.0V
9.10.11 + 12.2V
13 + 5.2V

P861
1,2,3,4Vini + 24.3V

T-con SYNC60C4LV0.3
- ICT1 - THF930I
- LMU4142TI
* others: ICM1 - W9864G2GH-6, OP1, PO2 - I7814HS, ICE - 24C64WP
ICV1 - I7975, IC20 - XC95144XL
ICC1 - MAX9591
ICD2 - KA1718
ICD1 - TPS65167

You also have the voltage on the CN11 T-con listed there

tomsoft · Answer

Lisek, I gave the tensions in my PJ91, those in parentheses are different, but not actually ma.0V Schematics, schema I need, because I can't find it.

lisek · Answer

DPS-219DP Measurement of voltages during operation L6599D, NCP1606B Link and see v Link From the Electrode forum, e.g. Link _______________ DPS145PP-131 A for TOSHIBA 37XV743 (V71A00014900) and matrix LC370WUD_G * 32AZ510 with matrix T315HW041 STRA6069H MP-130I (AV-DP9060) NCP1607B SSC9502S The Delta company in its dogs is monothematic, the same IC has almost identical work layouts. NCP1607B / NCP1606B

tomsoft · Answer

TV not repaired - The client decided not to repair it further.

Toshiba 40LV685D TV - No Backlight, Replaced STR-A6069, SEM2107, AO4614, Inverter SSI-400-14A01

Why is the inverter in a Toshiba 40LV685D being shut down so the CCFL backlights never even flash, and what should be checked to stop the cyclic reset?

Cyclic TV resets persist with inverter disconnected

Cyclic TV resets persist with inverter disconnected

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