Personal computing discussed
Moderators: renee, Dposcorp, SpotTheCat
strangerguy wrote:And BTW, don't run the backlight at max all the time if you want your TV to last past the warranty period.
TV Technician: ziane Hassan wrote:Hi
these are the repair tips for your tv
-check capacitors CS804, CS805, CS806, CM812, CM813 (all 1000uf/16v)
-Tip for appliances using the BN94-01206D signal PCB. (Relay clicks slightly faster with a NVM corruption problem. R1131 and R1132 (both 68R) have visible signs of overheating. 13V is measured at one side of these parallel-connected resistors (while relay is on) and 1.2V at the other side. 210R is measured across C1102 (1uf/16V), in line with the 2 resistors. if C1102 is removed then only 37R can be measured . Replace C1102 (with 25V type), R1131 and R1132 (both 68R) at the underside of the signal board, next to connector Cn1101.
-(Electrolytic capacitors in PSU have been replaced). NVM memory IC1803 (AT24C256) has corrupled software. then replace NVM memory IC1803 (AT24C256), then proceed as follows: switch of appliance via mains switch, then solder two long wires at PIN 5 and 6 of IC and short them at the other end, then start TV via main switch, wait maximum 1-2 seconds ( a click can be heard, backlight doesn't switch on), the remove the short circuit at the two wires. NOTE: it is important not to exceed the time limit(1-2 seconds), otherwise the procedure will have to be repeated, then access service mode (INFO, MENU, mute) . select 'tuner' line and set it to 'AUTO' . then select RESET line. the set should reset itself and upon start-up, it should start automatic search.
BN44-00150B Parts List
======================
Vendor | Product | IP/SMPS Part Code | Location | CAP Vendor | CAP Series | Part Spec | SIZE | SVC Part CODE
-------+---------+-------------------+-------------------------------+------------+------------+------------------------+-------+--------------
HANSOL | S-IP | BN44-00150B | CM802,CM803,CM807,CM808 | SAMWHA | NXB | 1000μF 25V 105°C 10*20 | 10*20 | BN81-02020A
HANSOL | S-IP | BN44-00150B | CS804,CS805,CS806,CM812,CM813 | SAMWHA | NXB | 1000μF 10V 105°C 10*16 | 10*16 | BN81-02017A
1000μF Comparison Table
=======================
Manufacturer (Series) | Working Voltage | Dimensions | Max. Impedance | RMS Ripple Current | Life Time
----------------------+-----------------+---------------------+-------------------------+--------------------------+--------------------
Samwha (WB) | 10 v | 10.0 mm Ø x 16.0 mm | 0.038 Ω @ 20 °C 100 kHz | 1430 mA @ 105 °C 100 kHz | 4000 Hours @ 105 °C
Samwha (NXB) | 10 v | 10.0 mm Ø x 16.0 mm | 0.038 Ω @ 20 °C 100 kHz | 1430 mA @ 105 °C 100 kHz | 4000 Hours @ 105 °C
Panasonic (FM) | 16 v | 10.0 mm Ø x 20.0 mm | 0.019 Ω @ 20 °C 100 kHz | 2180 mA @ 105 °C 100 kHz | 5000 Hours @ 105 °C
Samwha (WB) | 25 v | 12.5 mm Ø x 20.0 mm | 0.025 Ω @ 20 °C 100 kHz | 2360 mA @ 105 °C 100 kHz | 5000 Hours @ 105 °C
Samwha (NXB) | 25 v | 10.0 mm Ø x 20.0 mm | 0.025 Ω @ 20 °C 100 kHz | 1900 mA @ 105 °C 100 kHz | 5000 Hours @ 105 °C
Jamicon (SK) | 25 v | 10.0 mm Ø x 20.0 mm | ??? | 1080 mA @ 85 °C 120 Hz | 2000 Hours @ 85 °C
Panasonic (FM) | 35 v | 12.5 mm Ø x 20.0 mm | 0.015 Ω @ 20 °C 100 kHz | 3190 mA @ 105 °C 100 kHz | 7000 Hours @ 105 °C
turboroe wrote:Samsung LCD TV Clicking or Not turning on walkthrough:
Main Problem: Popped low quality power board capacitors
Solder in new capacitors (the medium 1000uF next to the power board<->main board connectors. preferably 35V).
I strongly recommend swapping ALL the 1000uF ones for new - better quality - ones.
If TV still doesn´t turn on: EEPROM memory values are bugged.
Q. Why does this happen?
A. When Tv is plugged in it attempts to read EEPROM and reads some bad data, then resets (probably due to the Watchdog).
Note: Data gets corrupted because of the power board capacitors problem.
Solution brief:
- disable EEPROM chip to prevent TV from resetting (following steps 1, 2 and 3)
- manually set correct values to the EEPROM (following steps 4 to 10)
The EEPROM chip:
type: ATMEL 24C256 - small 8 pin IC surface mount (must be 5mm x 3mm)
location: on the bottom side of the main board
search google for: atmel 24c256 datasheet
download the datasheet and check the pin numbers
1. Short out the eeprom pins 5 & 6 ( the two pins that connect to resistors ).
The easiest way is to carefully solder a thin wire (about 6" length) to each of the 2
little round pre-soldered pads that lie in front of pins 5 and 6 and use the wires
as a contact breaker to easily shorten the pins.
2. Turn on the power - Instead of the usual noticeable relay click, you get a faint click,
the backlight stays off, nothing else happens.
3. Wait around 1-2 secs ( anything longer than this NEVER seemed to work ).
4. Remove the short.
Note: by now the TV is already in normal standby operation, but EEPROM values are still bugged.
5. Press the service mode key combination on the remote control.
Note: check service manual for the correct combination or try the following:
* info, menu, mute, power on) - In that order individually, one at a time.
* mute, 1, 8, 2, power on) - In that order individually, one at a time.
6. TV should come on with noise picture and then the service menu (press Source if it is difficult to read)
7. Immediately go to option Adjust and turn OFF the watchdogs
(especially in case your TV keeps turning off by itself at this point)
8. Now, for EVERY OPTION in ALL THE SUBMENUS, change EVERY VALUE and then change it back (toggle right-left)
to assure the EEPROM data is re-written correctly.
Note: To enter some submenus you have to press the right arrow instead of OK button.
To return, press exit.
Some values will still be currupt, though, and you will have to guess the right
one or consult the service manual for factory defaults, such as Panel vendor,
Memory vendor, panel type, etc.
But the TV will still work anyway, maybe not with the best image.
9. Go back to Adjust and turn back on the watchdogs.
10. Finally, Set TUNER to AUTO and then go back to root menu, goto RESET and select it
by pressing the right arrow.
Note: I recommend keeping the wires soldered to the EEPROM chip. You may need them in the future.
Just remember to tape the ends to prevent a short-circuit with the chassis.
Other thoughts: If your TV is clicking but still turns on after a while, I STRONGLY suggest you immediately stop using it and swap the power board capacitors at once before your EEPROM data gets bugged.