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Thanks Richard. With these clues I was able to repair and calibrate an RVC 2415 tach, the chip had died but I found the SAK215 replacement on ebay.

Helo..I have Metex ME-32 multimeter. Its 20 years old, but now I have a problem. If I shorten probes it shows -16mV. When I measure AA battery positive to positive it shows 1.3V when I change probes positive to negative it shows -1.6V. What can be wrong?

tenho um multimetro igual e nao consigo calibrar Metex M-3650 ja o tenho parado ha varios anos

Mucho tiempo para no hacer prácticanente nada . El tiempo es oro

This is a multimeter. I have had it since 1988. Precise and unbreakable, and I use it often.

Thank you very much for the much appreciated video of the repair of this further good meter. I damaged a few days ago the hybrid for measuring capacitance, in this condition it blocked the correct measurements of other parameters. Thanks to your video I regained my "right hand" and a friend!!! which is already 30 years old!!! - multimeter is already working and the hybrid "softens " in the jar hi hi Thank you very much and greetings 👏👏👏👏👍+ sub 🙂

Would you have a complete power board for one still? Mines died & I definitely don't have the know how to do all that

Süper Technologies dijital multimetre

what is the Zero adjust button, please. Reading ist mostly 6 digits at zero V A mA

tenho um multimetro igual e nao o consigo calibrar nao sei onde mandar reparar ja tem muitos anos sempre funcionou bem

Too bad, the Spanish subtitles don't work.I am from Colombia (South America).

Bom dia gostei muito de ver o seu vídeo do jeito que vc explica , por favor mim ajude , tenho uma tv LG 42lw4500 tem áudio mais não tenho imagem, e eu não tenho esquema dela. Onde posso encontrar esse esquema PCB P/N: EAX62865401/8 REV1,0 e qual é o valor desse resistor 102 na placa, por favor traduzir em português

Hello Richard. Nice and instructive video. I am looking to find a way to use a signal from the rev counter in order to use it as an input in a monitoring device, software programm. I would like to find a voltage which I could convert into RPM. Is there such a signal in this circuit, or is the meter working with an output current and not voltage? Thanks a lot!

i also repaired this model tv , with reheating the chip , thanks for you video and time take to do , it would have a lot more time than what the tv is worth but the information gained was very good , if this fails again i have found iphone 12 stensil for reballing of this chip , i also not like how lg have mounted the heatsink , with plastic spring loaded clips and metal springs on the board , replacing these and placing heatsink compound , surly help this chip as well

Bit risky being that rough with a motherboard might scratch the circuit

Thanks

The fine wire is not to be soldered on any scope probe it will change the specs especially the resistance of the probe, very tiny amount however it is the same process for all major brand probe.

Excelente me ayudo con una placa igualita y me cirvio

Hi I am a repairman living in Iran Please help me fix the TVs LG 42 W TV, only its red standby LED light is on and it does not turn on anymore ... I tried to control the remote and the buttons, but it did not turn on Please tell me how to start troubleshooting Thank you very much

tem como traduzir para português

Great video. Thank you. Cannot figure out how to remove the selector switch knob to access bottom PCB. Really appreciate any tips on how to remove. Thank you.

I found it quite frustrating and almost useless to try to listen to your description, watch intently what you were doing on the main screen, and then try to follow what was happening in the picture-in-picture. I wish you had simply described and shown step-by-step what you did.

Nice video, how long has this repair lasted?

Hi I was hoping you could help I'm looking for the correct internal settings for the hidden/ secret menu as mine has been messed up, this is for 42LW5700 Thanks

my tv of this exact model just stopped working and won’t turn on, red power light just keeps getting bright then going off like a pulse.. any help please anyone??

Hi, this is a great video. I have the same multimeter and my lcd anounciator values are jumping up and down regardless of leads imputed in the meter or not, touching or not aswell. The numbers keep changing in every selection, Ohms DC, AC, what ever. I would be really grateful to hear some of your thoughts on the matter. What could be the problem. Thank you in advance.

thank you for your help. can you help me find the motherboard? do u sell it?

Hi, Sir Richard, I have the same model and only and as per my checking I get 24V, 3.55V,2.4V and 36V on the powersupply. my questions is what would be the next move for it?

Dear Richard, thanks for analysis. What would be the current required for 36V Led backlights. I mean total current for 108 LEDs.

Thanks for sharing your knowledge. I have the 1994 version (grey casing) briefly shown at the beginning of the video - purchased at Dick Smith. Because of the name Metex, I mistakenly though it was German...hehe. It's got pat. pending US and Germany on the back. I like this 25yo meter although it's only 2000c (3-1/2 digits). Recently it developed a fault with reading AC voltages. Measurements on all scales were ~30% off. e.g. 178v reading for 240v mains. The ADC chip works on VDC only so VAC first needs to be converted and scaled. The designers couldn't fit all of the circuitry of the AC-to-DC converter on the main board so they resorted to using a vertically mounted extension PCB, naming it ADC-HD-201CR. Luckily the fault turned out to be caused by 2 bad 10 uF/16v caps (C6 & C9 on the main PCB). The approach used was to test the main board components of the AC-to-DC converter in-circuit, and then remove and re-test the ones with no or suspect readings. I'm glad I didn't have to go through the trouble of removing an extension PCB like you need to do. Finding your videos helped me repair the meter.

My multimeter name's voltgraft. Its a metex m 3650. And very good a device. Video is very professional

Mister, where can I get a new main board of Lg 42LW5700 ?

Que tal, se me estropeo mi tester Metex, no me mide el microamperimetro, no cambia la escala. No se si peda ayudarme

Thanks, it's work at my LG 42LW5700 but i baked the main board in 200°C in 10 minutes. Thank you very much sir

tachometer reading formula for hours on one tenths kya hain, koi frequency factors hain jo real time according to your wrist watch and hours of work by tachometer hours meter main bantee ho, koi correlation ho, saari dunia main pollution control hoga issey

how rpm and hours of work related with real time according to your wrist watch ,please discussed it with me so all world wide crane operators take a lesson

Por favor

Lastima lo necesito en español seria posible?

My Voltage to the Leds reads 50V but in yours 36V.. What is the correct Voltage?

Thanks a lot, i repaired not one but two dead TVs of mine with your method ! Thanks for sharing your knowledge !

Model number 42lw5700-ue the screen got distorted to no picture but it still has sounds.

Very Interesting video. It was useful to calibrate my Metex 4650 in the DCV range, unfortunately the 2 Volts scale is not accurate and alligned with the others example (200mv, 20v, 200v). My M4650 has two extra trimmers, one below the display and the other at the center of the four holes inputs and that are absent in your M3650. As you know do you think should be one of these two trimmers able to calibrate the scale of 1,9999 resolution. Thank you. 😉😊

MODEL NUMBER 42LW5700-TA LG

Sir my TV not starting relya no red indicated blinking but TV not starting plz help power problem aur (MB) mothar board problem

Thank you for a series of very interesting videos. I've got a very similiar model (LG 42LW5500) that shows the same problems as yours did (power board seems to be ok). I will try reflowing of the main graphics chip using my resoldering hot air station. But since the chip itself seem to be genererally sensitive to temperature, in order to avoid it failing again I was considering to permanently mount one or two 4x4cm active fans outside the chassis (same as you did in the video when you did your temperature measuring). Since the TV offers 12V on the video board, I was wondering whether I could take the power for those fans directly from there (by soldering a 2-pin wire that leads outside of the chassis through one of those holes, where I would connect the two fans. Do you see any problem with such an approach?

hello sir model nomber lg47lv3730-td smps back lite volt problem only,36volt no tv on red lite on slowly on plese help sir

Great video --can you tell me --we have a DGTEC HDPVR 320 - ok for digital channels - states HD --does that mean we can view/record HD channels --we tuned it in but only got sound -TV states HD -but doesn't show the channels

Sir,I have 42LD650,,Main board fault,power indicator light is blinking.already 2 time heating by oven,but same problems running on 2 day's,how to solve this problem,pls suggest me how to order new main board.plz ans.my whatsapp number +919090309737

This is a terrible way to "reflow" a BGA of this size and kind. It's not reflowing, really, it is merely expanding the balls so a contact is made; it'll fail within days or weeks and if anyone says they're happily running for months I simply won't believe them - been there, done that one too many times to take anyone's word. The only application of manual hot air "reflow" is with very small ICs like RAM chips where the area is so small and device is so thin and balls, accordingly, so little, that heat can get through the device to them and melt them while actually still providing enough heat to allow melt of the solder on the pads - something which simply won't happen with the 35230 and the air blower from this video. No hard feelings, the videos are without a doubt educational to many; still this is the wrong way to repair the problem, even though it would look like it works for a while.