Voltage and resistance measurment are wrong in HT118A

[eli120]

Hi all,
I got this DMM for about 3 weeks and used it only a few times.
Anyway, a few days ago I noticed that the voltage reading are 10 times higher than it should be.
And the resistance measurment shows 87 ohm when the probes are not measuring anything, in fact it shows 87 ohm even if the probes are disconnected.
I opened the DMM and looked for something burned or shorts on the PCB such as the resistors diveders and capacitors but didn't find such.
And the rest of the functions- mA, capacitance, temp are working fine.
I also clened the PCB with Alcohol but didn't help.
* the seller offered to refund me, but I want to fix it(atleast to try)

Any ideas to what to do next?
thanks

[abdulbadii]

refund it
it's a failed quality control in R for V range and few comp. else

[mzacharias]

Normally symptoms like this don't occur naturally - the meter was blown by overvoltage of some sort.

Get it exchanged or refunded. If not, you'll need another meter to try to troubleshoot.

Start by measuring the input impedance of the Volt-Ohm jack with respect to the common jack. Should read 10 to 11 MegOhms.

I'm guessing it will read less.

[eli120]

Normally symptoms like this don't occur naturally - the meter was blown by overvoltage of some sort.

Get it exchanged or refunded. If not, you'll need another meter to try to troubleshoot.

Start by measuring the input impedance of the Volt-Ohm jack with respect to the common jack. Should read 10 to 11 MegOhms.

I'm guessing it will read less.

I checked with another DMM(also cheap but that's what I have right now) and I got ~13.5M ohm
I checked with a cheap ESR meter and I got 12M ohm between the terminals.
anyway, all the measurment I done were in range of the device.

refund it
it's a failed quality control in R for V range and few comp. else

the seller said he will refund me and also said I could try to fix it or give it to someone to fix it.

And the main reason I want to try to fix it, it's mainlly because it got all the functions I need and seems to be preety accuarte(according to reviews online)- just for home testing here and there.
And also because it was preety cheap- I'm a student so I'm on budget right now.

Thnks

[Dr_McFish]

I have the same issue: it was working fine before, then then suddenly the volatage messurements are like 10x higher. 9V battery messures 116V